The studies behind what we do.

A controlled trial of traditional Chinese medicinal plants in widespread non-exudative atopic eczema.

Sheehan MP, Atherton DJ. A controlled trial of traditional Chinese medicinal plants in widespread non-exudative atopic eczema. Br J Dermatol 1992;126(2):179-84.

Study type: RCT (double-blind, placebo-controlled, crossover)

What: Great Ormond Street (Hospital for Sick Children, London). 47 children with severe, widespread, non-exudative atopic eczema; 8 weeks active decoction vs 8 weeks placebo in random order, 4-week washout. 37 completed. A *specific prescription formulated for this one presentation* (the ten-herb formula later productised as "Zemaphyte" — Dr Luo Dinghui's formula).

Found: Active treatment superior to placebo and "clinically valuable"; no haematological, renal or hepatic toxicity.

Why it matters: The landmark. Western dermatology's first double-blind evidence that TCM herbs work in pediatric eczema — and it worked because the formula was matched to a pattern, not to the diagnosis "eczema."

Efficacy of traditional Chinese herbal therapy in adult atopic dermatitis.

Sheehan MP, Rustin MH, Atherton DJ, Buckley C, Harris DW, Brostoff J, Ostlere L, Dawson A. Efficacy of traditional Chinese herbal therapy in adult atopic dermatitis. Lancet 1992;340(8810):13-7.

Study type: RCT (double-blind, placebo-controlled, crossover)

What: Royal Free Hospital. 40 adults with longstanding, refractory, widespread AD; same ten-herb daily decoction vs placebo, 2 months each, 4-week washout.

Found: Geometric mean erythema score 12.6 (active) vs 113 (placebo); surface damage 11.3 vs 111.0; ratio CI 0.04-0.22 (p<0.0005). 20 of 31 preferred the active phase vs 4 placebo (p<0.02). Itch improved (p<0.001), sleep trended (p=0.078). No side-effects; decoction unpalatable.

Why it matters: A ~90% reduction in erythema scores in a Lancet double-blind trial is the number to quote when a pediatrician asks "is there any evidence." Also the adult companion to our pediatric case.

Treatment of atopic eczema with traditional Chinese medicinal plants.

Atherton DJ, Sheehan MP, Rustin MH, Whittle B, Guy G. Treatment of atopic eczema with traditional Chinese medicinal plants. Pediatr Dermatol 1992;9(4):373-5.

Study type: Review / commentary (no abstract indexed)

What: The same group's short review for a pediatric dermatology audience, summarising the London experience.

Why it matters: Useful as the "pediatric dermatology journal took this seriously in 1992" citation; the substance is in [SHEEHAN-1992a/b].

One-year follow up of children treated with Chinese medicinal herbs for atopic eczema.

Sheehan MP, Atherton DJ. One-year follow up of children treated with Chinese medicinal herbs for atopic eczema. Br J Dermatol 1994;130(4):488-93.

Study type: Human observational (open-label extension, n=37)

What: All 37 trial completers' parents elected to continue. Goal: reach substantial improvement, then taper while holding the gain.

Found: At 12 months 18/37 had ≥90% reduction in eczema activity scores, 5 lesser improvement; 14 withdrew (10 non-response, 4 palatability/preparation). 7 children discontinued treatment without relapse; 16 needed maintenance but only 4 daily. Two children had asymptomatic AST elevations 7-14× normal on one occasion (therapy stopped because eczema was so well controlled), normal 8 weeks later.

Why it matters: This is the paper that describes *our* clinical arc — improve, taper, some children come off entirely. The roughly 50% sustained responder rate and the "taper, don't stop" design are the honest benchmark for what this medicine can do. The AST finding is why we keep liver safety in the frame for any long-course internal formula.

A controlled trial of traditional Chinese herbal medicine in Chinese patients with recalcitrant atopic dermatitis.

Fung AY, Look PC, Chong LY, But PP, Wong E. A controlled trial of traditional Chinese herbal medicine in Chinese patients with recalcitrant atopic dermatitis. Int J Dermatol 1999;38(5):387-92.

Study type: RCT (double-blind, placebo-controlled, crossover) — NULL RESULT

What: Hong Kong, same Zemaphyte preparation, same design (8 wk/4 wk washout/8 wk), 40 Chinese patients with recalcitrant AD, 37 completed.

Found: Both groups improved over time regardless of order; Zemaphyte offered no significant effect over placebo on erythema, surface damage, lichenification or scaling (except lichenification at week 4). Bloods normal.

Why it matters: Same herbs, no pattern matching, no effect. We show this null result on purpose: it is the clearest evidence that the match between pattern and treatment — not the herbs alone — is the active ingredient of a pattern-based approach.

Chinese herbal medicine for atopic dermatitis: a systematic review.

Tan HY, Zhang AL, Chen D, Xue CC, Lenon GB. Chinese herbal medicine for atopic dermatitis: a systematic review. J Am Acad Dermatol 2013;69(2):295-304.

Study type: Systematic review (7 RCTs; meta-analysis limited by heterogeneity)

Found: Combined CHM + Western medicine superior to Western medicine alone; 3 of 6 placebo-controlled trials showed significant efficacy; 2 showed significantly reduced need for concurrent (steroid) therapy; no serious adverse events. Conclusion: significant symptom improvement, well tolerated, but study quality too poor for routine-use conclusions.

Why it matters: The JAAD-indexed summary a pediatrician will trust; also the "steroid-sparing" signal is one of our core claims.

Chinese herbal medicine for atopic eczema: an overview of clinical evidence.

Gu SX, Zhang AL, Coyle ME, Chen D, Xue CC. Chinese herbal medicine for atopic eczema: an overview of clinical evidence. J Dermatolog Treat 2017;28(3):246-250.

Study type: Overview of systematic reviews and RCTs 2013-2016

Found: Cochrane review suggests oral CHM may improve health-related quality of life in children with moderate-severe AE; benefit on severity needs higher-quality trials.

Why it matters: The quality-of-life finding maps directly onto what parents report first (sleep, mood, the house calming down) before SCORAD-type scores move — consistent with what families consistently report first: sleep, mood and the household settle before the skin's severity scores move.

Huanglian ointment alleviates eczema by maintaining the balance of c-Jun and JunB and inhibiting AGE-RAGE-mediated pro-inflammation signaling pathway.

Wang S, Wang Y, Han B, Chen Y, Bai X, Yu S, Liu M. Huanglian ointment alleviates eczema by maintaining the balance of c-Jun and JunB and inhibiting AGE-RAGE-mediated pro-inflammation signaling pathway. Phytomedicine 2022;105:154372.

Study type: Animal (Biostir-AD guinea pig) + in vitro (TNF-α/IFN-γ HaCaT) + network pharmacology

Found: 14 components by GC-MS; 78 eczema-intersecting targets (Jun family, inflammatory regulators, chemokines). In vivo: reduced lesions, restored histology, lowered TNF-α, IFN-γ, IL-6. In vitro: protected keratinocytes, suppressed TARC/MDC/RANTES. Mechanism: restored filaggrin via c-Jun/JunB balance; inhibited AGE-RAGE.

Why it matters: Huang Lian Gao is a barrier-repair agent as well as a heat-toxin antimicrobial — this supports its use on hot, inflamed Damp-Heat lesions, not only visibly infected ones.

Berberine Inhibits the Inflammatory Response Induced by Staphylococcus aureus Isolated from Atopic Eczema Patients via the TNF-α/Inflammation/RAGE Pathways.

Maskey AR, Kopulos D, Kwan M, et al. Berberine Inhibits the Inflammatory Response Induced by Staphylococcus aureus Isolated from Atopic Eczema Patients via the TNF-α/Inflammation/RAGE Pathways. Cells 2024;13(19).

Study type: In vitro + animal (keratinocyte/immune cell lines; S. aureus isolated from real eczema patients)

What: Exposed human skin cells to S. aureus strains taken from eczema patients, with and without berberine (the main active compound of Huang Lian).

Found: Berberine was bacteriostatic and suppressed TNF-α by more than 90% at 20 µg/mL, down-regulated inflammatory genes and reduced oxidative stress — through the same RAGE pathway the Huanglian-ointment study found independently in 2022.

Why it matters: "Resolve Toxin" is both halves at once — restrain the bacterium and switch off the skin's overreaction to it. Two labs, two years apart, found the same pathway.

A berberine-loaded hydrogel for the treatment of atopic dermatitis through antibacterial activity, inhibition of inflammation and modulation of oxidative stress.

Peng Z, Wei XY, Zeng X, et al. A berberine-loaded hydrogel for the treatment of atopic dermatitis through antibacterial activity, inhibition of inflammation and modulation of oxidative stress. Front Immunol 2026.

Study type: Animal (topical, AD mouse model) + in vitro

What: A modern topical berberine hydrogel applied to mice with eczema-like disease.

Found: Reduced redness, swelling and crusting; suppressed inflammatory markers; restored skin-barrier proteins, via PI3K/AKT/NF-κB.

Why it matters: A 2026 pharmaceutical formulation arriving at what Huang Lian Gao already is: topical berberine for inflamed, infection-prone eczema.

Berberine induces anti-atopic dermatitis effects through the downregulation of cutaneous EIF3F and MALT1 in NC/Nga mice.

Andoh T, Yoshihisa Y, Rehman MU, Tabuchi Y, Shimizu T. Berberine induces anti-atopic dermatitis effects through the downregulation of cutaneous EIF3F and MALT1 in NC/Nga mice. Biochem Pharmacol 2021;185:114429.

Study type: Animal (oral, NC/Nga AD mouse model)

What: Oral berberine in the standard Japanese eczema mouse model.

Found: Less scratching, lower skin symptom scores, fewer eosinophils and mast cells in skin; mechanism traced to mast-cell genes (EIF3F, MALT1).

Why it matters: Independent evidence that berberine quiets the mast-cell and itch machinery, not just bacteria.

Anti-Inflammatory Activities of Pentaherbs Formula, Berberine, Gallic Acid and Chlorogenic Acid in Atopic Dermatitis-Like Skin Inflammation.

Tsang MS, Jiao D, Chan BC, et al. Anti-Inflammatory Activities of Pentaherbs Formula, Berberine, Gallic Acid and Chlorogenic Acid in Atopic Dermatitis-Like Skin Inflammation. Molecules 2016;21(4):519.

Study type: Animal + human cells

What: A five-herb pediatric eczema formula and its isolated actives, including berberine, in AD-like mouse models and human cell culture.

Found: Reduced ear swelling, epidermal thickening and eosinophil infiltration; berberine alone suppressed pro-inflammatory cytokines in human cells.

Why it matters: Hong Kong's clinical pentaherbs tradition and our topical share the same active — and the isolated compound reproduces the effect.

MicroRNA-21-Mediated Inhibition of Mast Cell Degranulation Involved in the Protective Effect of Berberine on 2,4-Dinitrofluorobenzene-Induced Allergic Contact Dermatitis in Rats via p38 Pathway.

Li W, Liu F, Wang J, Long M, Wang Z. MicroRNA-21-Mediated Inhibition of Mast Cell Degranulation Involved in the Protective Effect of Berberine on 2,4-Dinitrofluorobenzene-Induced Allergic Contact Dermatitis in Rats via p38 Pathway. Inflammation 2018;41(6):2276-2284.

Study type: Animal (rat contact-dermatitis model)

What: Berberine in an allergic contact dermatitis model.

Found: Significantly reduced ear swelling by blocking mast-cell degranulation through a microRNA-21/p38 route.

Why it matters: Another independent route to the same endpoint: berberine stops mast cells from dumping histamine.

Berberine suppresses mast cell-mediated allergic responses via regulating FcεRI-mediated and MAPK signaling.

Fu S, Ni S, Wang D, Fu M, Hong T. Berberine suppresses mast cell-mediated allergic responses via regulating FcεRI-mediated and MAPK signaling. Int Immunopharmacol 2019;71:1-6.

Study type: In vitro + animal (mast-cell line; passive cutaneous anaphylaxis in mice)

What: IgE-triggered mast cells treated with berberine, plus a live-skin allergy model.

Found: Reduced histamine, β-hexosaminidase, IL-4 and TNF-α release; blocked the Lyn/Syk signalling directly under the IgE receptor; inhibited skin anaphylaxis in vivo.

Why it matters: The molecular wiring of "clears Heat, dries Damp" on the exudative, allergic flare: berberine acts directly beneath the IgE receptor.

Network Pharmacology Integrated with Transcriptomics Analysis Reveals Ermiao Wan Alleviates Atopic Dermatitis via EGFR/AKT/MAPK.

Xia T, Liang X, Liu CS, et al. Network Pharmacology Integrated with Transcriptomics Analysis Reveals Ermiao Wan Alleviates Atopic Dermatitis via EGFR/AKT/MAPK. Drug Des Devel Ther 2022;16:4159-4175.

Study type: Animal + computational (network pharmacology, DNCB mouse model)

What: Ermiao Wan — a classical Damp-clearing formula whose key actives include berberine (from Huang Bo, Coptis's sister berberine herb) — analysed computationally and validated in an AD mouse model.

Found: 57 causal targets identified around EGFR/AKT/MAPK; the formula alleviated AD-like disease in mice through that network.

Why it matters: The berberine-bearing Damp-clearing formula class maps onto a definable receptor network — the classical category has a molecular shape.

Potent in vitro synergism of fusidic acid and berberine chloride against clinical isolates of methicillin-resistant Staphylococcus aureus.

Liang RM, Yong XL, Duan YQ, et al. Potent in vitro synergism of fusidic acid and berberine chloride against clinical isolates of methicillin-resistant Staphylococcus aureus. World J Microbiol Biotechnol 2014;30(11):2839-2847.

Study type: In vitro (30 clinical MRSA strains)

What: Berberine combined with the antibiotic fusidic acid against hospital MRSA isolates.

Found: Synergy in a subset of strains — on one resistant isolate the combination cut bacterial density by over 4 logs in 24 h; berberine also reduced biofilm formation and disrupted mature biofilm.

Why it matters: Biofilm is what makes eczema's staph so hard to clear; berberine attacks the biofilm itself and can make antibiotics work better, not compete with them.

Controlled release of berberine modulates the wound microbiome to accelerate wound healing.

Xu Z, Zhang L, Guo J, et al. Controlled release of berberine modulates the wound microbiome to accelerate wound healing. Asian J Pharm Sci 2026.

Study type: Animal (wound model with microbiome sequencing)

What: Berberine delivered from sustained-release scaffolds into healing wounds.

Found: Sustained release healed best; sequencing showed berberine reshaped the wound's bacterial community and modulated immune signalling (CXCL10/IFN-α).

Why it matters: An ointment IS a sustained-release vehicle — the traditional sesame-oil/beeswax base does by craft what this 2026 paper does by engineering.

Displacement of bilirubin from albumin by berberine.

Chan E. Displacement of bilirubin from albumin by berberine. Biol Neonate 1993;63(4):201-208.

Study type: In vitro + animal — SAFETY (oral/systemic exposure)

What: The classic safety study: berberine's effect on bilirubin binding, relevant to newborn jaundice.

Found: Berberine displaced bilirubin from albumin ~10× more potently than phenylbutazone; the author concluded berberine-rich herbs are best avoided in jaundiced neonates and pregnancy.

Why it matters: This is why we never use Coptis preparations internally in young infants and keep the topical off newborn skin. Showing the safety literature is part of showing the research.

Berberine-induced haemolysis revisited: safety of Rhizoma coptidis and Cortex phellodendri in chronic haematological diseases.

Linn YC, Lu J, Lim LC, et al. Berberine-induced haemolysis revisited: safety of Rhizoma coptidis and Cortex phellodendri in chronic haematological diseases. Phytother Res 2012;26(10):1450-1457.

Study type: Human observational — SAFETY

What: 20 adult patients on long-term oral Coptis/Phellodendron, monitored.

Found: No organ toxicity or blood abnormalities; the historical Singapore ban (driven by the neonatal jaundice concern) was reassessed as specific to newborns, not a general contraindication.

Why it matters: The berberine caution is age- and route-specific. Precision about who a risk applies to is what honest herbal medicine looks like.

Efficacy and safety of indigo naturalis ointment in Treating Atopic Dermatitis: A randomized clinical trial.

Lin YK, Chang SH, Yang CY, See LC, Lee BH, Shih IH. Efficacy and safety of indigo naturalis ointment in Treating Atopic Dermatitis: A randomized clinical trial. J Ethnopharmacol 2020;250:112477.

Study type: RCT (double-blind, vehicle-controlled; ages 6–65; NCT02669888)

What: Refined indigo naturalis oil (Lindioil) twice daily vs vehicle for 6 weeks in 48 people with atopic dermatitis, including children from age 6.

Found: Eczema severity (EASI) fell 49.9% on indigo vs 19.6% on vehicle (p=0.024); superior on every secondary endpoint including itch and quality of life; no significant adverse events.

Why it matters: The first randomized trial of a topical Qing Dai preparation in eczema itself — the "clear Heat, cool Blood" ointment beat its own base oil, with pediatric participants included.

Efficacy and safety of indigo naturalis oil extract (Lindioil ointment) for the treatment of atopic dermatitis: a randomized, crossover, evaluator-blinded, controlled trial.

Yang CY, et al. Efficacy and safety of indigo naturalis oil extract (Lindioil ointment) for the treatment of atopic dermatitis: a randomized, crossover, evaluator-blinded, controlled trial. Front Pharmacol 2025;16:1546589.

Study type: RCT (crossover vs tacrolimus, n=22 adults)

What: Indigo ointment head-to-head against tacrolimus, a standard prescription immunosuppressant cream.

Found: Tacrolimus reduced severity more (−71% vs −41% EASI), but caused local side-effects in 61% of users vs 10% for indigo; indigo also reduced S. aureus colonisation toward healthy-skin levels and shifted the skin microbiome back toward normal.

Why it matters: Honest comparison: the pharmaceutical is stronger, the herb is far gentler — and only the herb showed the antimicrobial, microbiome-restoring action. Different tools for different lesions.

Comparison of indirubin concentrations in indigo naturalis ointment for psoriasis treatment: a randomized, double-blind, dosage-controlled trial.

Lin YK, et al. Comparison of indirubin concentrations in indigo naturalis ointment for psoriasis treatment: a randomized, double-blind, dosage-controlled trial. Br J Dermatol 2018;178(1):124-131.

Study type: RCT (dose-ranging)

What: Four concentrations of indirubin (indigo's key active) in psoriasis, to find the dose-response.

Found: Highest dose: PASI severity down 69%, with 57% of patients reaching PASI75 and 30% PASI90; no severe adverse events over 20 weeks.

Why it matters: A clean dose-response curve is pharmacology's signature that the active is real — indirubin behaves like a drug because it is one.

Clinical assessment of patients with recalcitrant psoriasis in a randomized, observer-blind, vehicle-controlled trial using indigo naturalis.

Lin YK, et al. Clinical assessment of patients with recalcitrant psoriasis in a randomized, observer-blind, vehicle-controlled trial using indigo naturalis. Arch Dermatol 2008;144(11):1457-64.

Study type: RCT (intra-patient, vehicle-controlled, n=42)

What: Crude indigo ointment vs its own base, on matched plaques of the same patients, 12 weeks.

Found: 74% of patients reached clearance or near-clearance on the treated side; severity scores halved relative to control.

Why it matters: Published in the American Medical Association's dermatology journal — the moment topical Qing Dai entered the Western evidence base.

The efficacy and safety of topically applied indigo naturalis ointment in patients with plaque-type psoriasis.

Lin YK, et al. The efficacy and safety of topically applied indigo naturalis ointment in patients with plaque-type psoriasis. Dermatology 2007;214(2):155-61.

Study type: RCT + skin biopsy immunohistochemistry

What: Indigo ointment with before/after biopsies to see what changed in the tissue.

Found: Proliferation marker Ki-67 fell, T-cell infiltration fell, and filaggrin — the skin's key barrier protein — rose in the treated epidermis.

Why it matters: Direct human-tissue evidence that a "Heat-clearing" ointment rebuilds the barrier while calming inflammation — one action, two vocabularies.

Clinical efficacy and IL-17 targeting mechanism of Indigo naturalis as a topical agent in moderate psoriasis.

Cheng HM, Wu YC, Wang Q, et al. Clinical efficacy and IL-17 targeting mechanism of Indigo naturalis as a topical agent in moderate psoriasis. BMC Complement Altern Med 2017;17(1):439.

Study type: RCT + gene-expression profiling (Janssen R&D collaboration; NCT01901705)

What: A pharma-collaborated trial that sequenced patients' skin before and after indigo treatment.

Found: PASI75 in 56% vs 0% on placebo; the IL-17 inflammatory gene signature was normalised by treatment; the active tryptanthrin directly inhibited IL-17 signalling in skin cells.

Why it matters: IL-17 is the axis behind the thick, sharply-bordered "psoriasiform" eczema common in Asian skin — this is why the Blood-Heat plaque is indigo's lesion.

Evidence and potential mechanism of action of indigo naturalis and its active components in the treatment of psoriasis.

Wang C, Yang P, Wang J, et al. Evidence and potential mechanism of action of indigo naturalis and its active components in the treatment of psoriasis. Ann Med 2024;56(1):2329261.

Study type: Systematic review + meta-analysis

What: Pooled the clinical and animal evidence for indigo and its actives across seven databases.

Found: Clinically meaningful response-rate advantages; in mouse models indirubin lowered severity scores, epidermal thickness, IL-17A and IL-23; mechanism synthesis spans JAK/STAT, Wnt/β-catenin and AP-1 pathways.

Why it matters: The bird's-eye confirmation that the indigo results are a literature, not a lucky trial.

Indirubin, an acting component of indigo naturalis, inhibits EGFR activation and EGF-induced CDC25B gene expression in epidermal keratinocytes.

Hsieh WL, Lin YK, Tsai CN, et al. Indirubin, an acting component of indigo naturalis, inhibits EGFR activation and EGF-induced CDC25B gene expression in epidermal keratinocytes. J Dermatol Sci 2012;67(2):140-6.

Study type: In vitro (human keratinocytes)

What: How indirubin stops skin cells over-multiplying.

Found: Down-regulated the growth receptor EGFR and the cell-cycle enzyme CDC25B that drives hyperproliferation.

Why it matters: "Heat" skin is over-proliferating skin; this is the brake, named.

Indirubin inhibits Wnt/β-catenin signal pathway via promoter demethylation of WIF-1.

Liu SG, Luo GP, Qu YB, Chen YF. Indirubin inhibits Wnt/β-catenin signal pathway via promoter demethylation of WIF-1. BMC Complement Med Ther 2020;20(1):250.

Study type: In vitro (HaCaT keratinocytes)

What: A second, epigenetic route for indirubin's anti-proliferative effect.

Found: Indirubin demethylated and re-awakened WIF-1, a natural inhibitor of the Wnt growth pathway, slowing keratinocyte proliferation.

Why it matters: The same herb active works through multiple independent brakes — the redundancy is why whole-plant preparations are forgiving.

Tapinarof cream 1% once daily: Significant efficacy in the treatment of moderate to severe atopic dermatitis in adults and children down to 2 years of age in the pivotal phase 3 ADORING trials.

Silverberg JI, Eichenfield LF, Hebert AA, et al. Tapinarof cream 1% once daily: Significant efficacy in the treatment of moderate to severe atopic dermatitis in adults and children down to 2 years of age in the pivotal phase 3 ADORING trials. J Am Acad Dermatol 2024;91(3):457-465.

Study type: RCT ×2 (phase 3, n=813, ages ≥2; industry-sponsored)

What: Not a herb — the FDA-approved (Dec 2024) topical AhR-agonist drug for eczema, included as the pharmaceutical analogue of indigo's mechanism.

Found: EASI75 in 56–59% vs 21–23% on vehicle; the authors describe the mechanism as down-regulating Th2 cytokines, up-regulating skin-barrier components, reducing oxidative stress.

Why it matters: Indirubin is an aryl-hydrocarbon-receptor ligand. Western medicine just approved, with a patent, the receptor action Qing Dai ointment has been delivering for centuries.

Coal tar induces AHR-dependent skin barrier repair in atopic dermatitis.

van den Bogaard EH, Bergboer JGM, Vonk-Bergers M, et al. Coal tar induces AHR-dependent skin barrier repair in atopic dermatitis. J Clin Invest 2013;123(2):917-27.

Study type: Mechanistic (patient-derived human skin cells and models)

What: Solved a two-thousand-year-old mystery: why coal tar works in eczema.

Found: Coal tar activates the AhR receptor, restoring filaggrin and barrier proteins even in cells carrying filaggrin mutations, and reversing the barrier damage Th2 cytokines cause.

Why it matters: The precedent case: an ancient topical, a modern receptor. It is the strongest biological bridge for reading traditional topicals seriously.

Efficacy of Shiunko for the treatment of atopic dermatitis.

Higaki S, et al. Efficacy of Shiunko for the treatment of atopic dermatitis. J Int Med Res 1999;27(3):143-147.

Study type: Small controlled human study

What: Shiunko (the Japanese Purple Cloud Ointment) vs petrolatum vs salt water on atopic dermatitis.

Found: Clinically effective in 4 of 7 Shiunko patients vs 0 of 7 on petrolatum; staphylococcal counts on the skin fell in most Shiunko patients.

Why it matters: Tiny, but the only head-to-head human eczema data for the transitional ointment — and the effect ran through the bacteria, as the "resolve Toxin" function predicts.

The prevention of 2,4-dinitrochlorobenzene-induced inflammation in atopic dermatitis-like skin lesions in BALB/c mice by Jawoongo.

Ku JM, Hong SH, Kim SR, et al. The prevention of 2,4-dinitrochlorobenzene-induced inflammation in atopic dermatitis-like skin lesions in BALB/c mice by Jawoongo. BMC Complement Altern Med 2018;18:215.

Study type: Animal + in vitro

What: Jawoongo (Korea's Purple Cloud Ointment) in the standard chemical-induced eczema mouse model.

Found: Reduced skin thickening and immune-cell infiltration; lowered IgE, IL-4, IL-13, IL-6 and TNF-α; suppressed the MAPK and NF-κB inflammatory machinery.

Why it matters: Three national traditions (China, Japan, Korea) kept the same formula for the same job; the mouse data shows what the job is molecularly.

Lithospermum erythrorhizon Alleviates Atopic Dermatitis-like Skin Lesions by Restoring Immune Balance and Skin Barrier Function in 2,4-Dinitrochlorobenzene-Induced NC/Nga Mice.

Oh J-S, Lee S-J, Choung S-Y. Lithospermum erythrorhizon Alleviates Atopic Dermatitis-like Skin Lesions by Restoring Immune Balance and Skin Barrier Function in 2,4-Dinitrochlorobenzene-Induced NC/Nga Mice. Nutrients 2021;13(9):3209.

Study type: Animal (dose-controlled, vs prednisolone comparator)

What: Zi Cao (Lithospermum) extract tested against the steroid prednisolone in eczema mice.

Found: Matched the steroid on dermatitis scores and beat it on IgE and histamine; rebalanced Th1/Th2; lowered the itch cytokine IL-31 and alarm signal TSLP; raised filaggrin, involucrin, loricrin and the tight-junction proteins.

Why it matters: The "cool Blood, generate flesh" herb rebuilt the entire barrier program while matching a steroid on inflammation — with none of a steroid's thinning.

Oral supplementation of Lithospermum erythrorhizon prevents the development of atopic dermatitis with reducing ceramide degradation in the epidermis of NC/Nga mice.

Kim J, Cho Y. Oral supplementation of Lithospermum erythrorhizon prevents the development of atopic dermatitis with reducing ceramide degradation in the epidermis of NC/Nga mice. Phytother Res 2009;23(9):1250-1256.

Study type: Animal

What: Long-term Zi Cao extract in eczema-prone mice, measuring skin lipids.

Found: Less scratching, lower IgE — and higher epidermal ceramides, because Zi Cao reduced the enzyme that degrades them.

Why it matters: Eczema skin is ceramide-starved. The Blood-nourishing herb literally restocks the lipid mortar between the skin's bricks.

A Study of the Effect of Shiunko, a Traditional Chinese Herbal Medicine, on Fibroblasts and Its Implication on Wound Healing Processes.

Chak K-F, Hsiao C-Y, Chen T-Y. A Study of the Effect of Shiunko, a Traditional Chinese Herbal Medicine, on Fibroblasts and Its Implication on Wound Healing Processes. Adv Wound Care 2013;2(8):448-455.

Study type: In vitro (human fibroblasts) + animal wound model

What: What Purple Cloud Ointment does to the cells that rebuild skin.

Found: Fibroblast proliferation up ~50%, collagen secretion up 125–160%, and the master repair signal TGF-β up 10- to 40-fold; wounds closed faster in vivo.

Why it matters: "Generates flesh" (生肌) is a four-hundred-year-old phrase. TGF-β is its name in the new vocabulary.

Wound healing effects of deoxyshikonin isolated from Jawoongo: In vitro and in vivo studies.

Kim TH, et al. Wound healing effects of deoxyshikonin isolated from Jawoongo: In vitro and in vivo studies. J Ethnopharmacol 2017;196:126-131.

Study type: In vitro + animal

What: One purified Zi Cao active (deoxyshikonin) tested alone.

Found: Accelerated skin-cell migration and wound closure.

Why it matters: The formula's healing effect survives isolation to a single named molecule — the pharmacology is real, not a vehicle effect.

Potential Efficacy of Shiunko for Anti-EGFR Monoclonal Antibody-Induced Skin Fissure: A Single Institutional Case Series.

Okunaka M, et al. Potential Efficacy of Shiunko for Anti-EGFR Monoclonal Antibody-Induced Skin Fissure: A Single Institutional Case Series. Integr Cancer Ther 2024;23.

Study type: Human case series (n=11, oncology)

What: Modern oncology using Shiunko for the painful skin fissures caused by targeted cancer drugs.

Found: 4 of 11 fissures fully healed at 2 weeks and most of the rest improved; no adverse events; patients stayed on their cancer therapy.

Why it matters: A contemporary hospital reaching for the 1617 ointment when modern drugs break the skin — and publishing the result.

The Mechanism Underlying the Antibacterial Activity of Shikonin against Methicillin-Resistant Staphylococcus aureus.

Lee Y-S, et al. The Mechanism Underlying the Antibacterial Activity of Shikonin against Methicillin-Resistant Staphylococcus aureus. Evid Based Complement Alternat Med 2015;2015:520578.

Study type: In vitro (MRSA)

What: How shikonin, Zi Cao's signature red pigment, kills resistant staph.

Found: Shikonin binds the bacterial cell wall's peptidoglycan and permeabilises the membrane; combining it with membrane agents cut MRSA density by 75%.

Why it matters: Even the gentle transitional ointment carries real antimicrobial cover — useful on healing skin that staph would love to recolonise.

Pharmacological and analytical aspects of alkannin/shikonin and their derivatives: An update from 2008 to 2022.

Kaur K, Sharma R, Singh A, et al. Pharmacological and analytical aspects of alkannin/shikonin and their derivatives: An update from 2008 to 2022. Chin Herb Med 2022;14(4):511-527.

Study type: Review

What: Fourteen years of shikonin research reviewed: anti-inflammatory (NF-κB), antioxidant (Nrf2), anti-TSLP, antifungal, anti-MRSA, wound healing.

Found: Broad mechanistic support — and an explicit flag that formal toxicology and safety data are still lacking.

Why it matters: We show the gap as well as the promise: the review itself says the safety file is incomplete, which is why we use Zi Cao conservatively on infants.

The topical application of low-temperature argon plasma enhances the anti-inflammatory effect of Jaun-ointment on DNCB-induced NC/Nga mice.

Choi Y-J, et al. The topical application of low-temperature argon plasma enhances the anti-inflammatory effect of Jaun-ointment on DNCB-induced NC/Nga mice. BMC Complement Altern Med 2017.

Study type: Animal

What: Purple Cloud Ointment combined with a physical plasma therapy in eczema mice.

Found: The ointment's anti-inflammatory effect was confirmed and enhanced by the combination.

Why it matters: A further independent replication of the ointment's effect in the standard model.

The effects of Chinese botanical lotion and pimecrolimus cream in the treatment of chronic perianal eczema: a randomized clinical trial.

Lai L, et al. The effects of Chinese botanical lotion and pimecrolimus cream in the treatment of chronic perianal eczema: a randomized clinical trial. Front Pharmacol 2025;16:1673112.

Study type: RCT (n=99, three hospitals, vs pimecrolimus)

What: A Ku Shen-based herbal lotion head-to-head against pimecrolimus (a standard prescription cream) for chronic perianal eczema.

Found: Higher response rate (100% vs 88%), better itch relief, and — the striking number — relapse at 12 weeks: 6% on the herbal lotion vs 20% on pimecrolimus. No serious adverse events.

Why it matters: A third of the relapses. That pattern — the herb changing the terrain rather than just muting the symptom — is the entire premise of pattern-based treatment.

Matrine regulates Th1/Th2 inflammatory responses by inhibiting the Hsp90/NF-κB signaling axis to alleviate atopic dermatitis.

Huang P, Hu F, Yang ZB, et al. Matrine regulates Th1/Th2 inflammatory responses by inhibiting the Hsp90/NF-κB signaling axis to alleviate atopic dermatitis. Kaohsiung J Med Sci 2023;39(5):501-510.

Study type: Animal + in vitro

What: Matrine, Ku Shen's main alkaloid, in eczema mice and inflamed human keratinocytes.

Found: Lowered Th2 cytokines and the eczema chemokine TARC; blocked the Hsp90/NF-κB axis; stopped T cells differentiating toward the allergic Th2 type.

Why it matters: The bitter cold "stop itch" herb works upstream, on the allergic polarisation itself.

The mechanism of oxymatrine on atopic dermatitis in mice based on SOCS1/JAK-STAT3 pathway.

Han X, Ma T, Wang Q, et al. The mechanism of oxymatrine on atopic dermatitis in mice based on SOCS1/JAK-STAT3 pathway. Front Pharmacol 2023;13:1091090.

Study type: Animal (dose-controlled)

What: Oxymatrine, Ku Shen's second alkaloid, in the calcipotriol eczema model.

Found: Dose-dependent falls in IL-4, IL-6, IL-17, TNF-α and IgE; worked by boosting SOCS1, the body's own brake on the JAK-STAT inflammation pathway.

Why it matters: JAK inhibitors are dermatology's newest eczema drug class; Ku Shen's alkaloid reaches the same pathway through the body's own off-switch.

Antipruritic Effects of Sophora flavescens on Acute and Chronic Itch-Related Responses in Mice.

Yamaguchi-Miyamoto T, et al. Antipruritic Effects of Sophora flavescens on Acute and Chronic Itch-Related Responses in Mice. Biol Pharm Bull 2003;26(5):722-6.

Study type: Animal

What: The classic screening study of Ku Shen against acute and chronic itch.

Found: Dose-dependent suppression of both induced and spontaneous chronic scratching, without sedation; more potent than She Chuang Zi in the same screen.

Why it matters: "Stops itch" survived a modern behavioural assay two decades ago — this is the study that put Ku Shen on pharmacology's map for pruritus.

Osthole ameliorates chronic pruritus in 2,4-dichloronitrobenzene-induced atopic dermatitis by inhibiting IL-31 production.

He S, Liang X, Chen W, et al. Osthole ameliorates chronic pruritus in 2,4-dichloronitrobenzene-induced atopic dermatitis by inhibiting IL-31 production. Chin Herb Med 2025;17(2):368-379.

Study type: Animal + in vitro

What: Osthole, She Chuang Zi's main active, against the modern "itch cytokine" IL-31.

Found: Less scratching, thinner lesions; IL-31 and its receptor suppressed in skin and cells; IgE, TNF-α and histamine all down; works through PPAR and NF-κB.

Why it matters: IL-31 is the antihistamine-resistant itch signal — the itch TCM calls Wind. The warm partner herb hits it directly.

Osthole inhibits histamine-dependent itch via modulating TRPV1 activity.

Yang NN, Shi H, Yu G, et al. Osthole inhibits histamine-dependent itch via modulating TRPV1 activity. Sci Rep 2016;6:25657.

Study type: Animal + electrophysiology (nerve-cell recordings)

What: Osthole tested directly on the itch-sensing channel TRPV1 in sensory neurons.

Found: Histamine-induced scratching cut from 70 bouts to 11; TRPV1 blocked at sub-micromolar potency (IC50 ≈0.41 µM) — while non-histamine chloroquine itch was untouched, proving the mechanism is specific.

Why it matters: Drug-grade potency at a named ion channel, from a seed that village medicine has used against itch for a millennium.

Antipruritic Effect of Ethyl Acetate Extract from Fructus cnidii in Mice with 2,4-Dinitrofluorobenzene-Induced Atopic Dermatitis.

Chen X, et al. Antipruritic Effect of Ethyl Acetate Extract from Fructus cnidii in Mice with 2,4-Dinitrofluorobenzene-Induced Atopic Dermatitis. Evid Based Complement Alternat Med 2020;2020:6981386.

Study type: Animal (topical application)

What: A topically applied, osthole-rich She Chuang Zi extract in eczema mice — the closest model to the cream itself.

Found: Dermatitis scores down ~60%, scratching halved, IgE down 4-fold, skin thickness down two-thirds; the itch-driving signals TSLP, IL-33, IL-31 and IL-17 all suppressed.

Why it matters: Applied to the skin, as we use it, the extract quiets the entire itch-alarm cascade.

Synergic Anti-Pruritus Mechanisms of Action for the Radix Sophorae Flavescentis and Fructus Cnidii Herbal Pair.

Zhong J, Liu Z, Zhou X, Xu J. Synergic Anti-Pruritus Mechanisms of Action for the Radix Sophorae Flavescentis and Fructus Cnidii Herbal Pair. Molecules 2017;22(9):1465.

Study type: Computational (network pharmacology)

What: Why classical practice pairs cold Ku Shen with warm She Chuang Zi — mapped as receptor networks.

Found: The two herbs' actives hit largely non-overlapping anti-itch targets — Sophora's alkaloids on inflammation and histamine/TRPA1 receptors, Cnidium's coumarins on PDE4, TLR9 and the κ-opioid receptor (the target of the newest FDA-approved itch drug).

Why it matters: The ancient pairing rule is multi-target drug design: the pair covers itch circuits neither herb covers alone.

Sophora flavescens–Angelica sinensis in the treatment of eczema by inhibiting TLR4/MyD88/NF-κB pathway.

Sun P, Zhao X, et al. Sophora flavescens–Angelica sinensis in the treatment of eczema by inhibiting TLR4/MyD88/NF-κB pathway. J Ethnopharmacol 2024;322:117626.

Study type: Animal + chemical profiling

What: The Ku Shen + Dang Gui pair (clear the Damp-Heat, nourish the Blood) in a mouse eczema model.

Found: Lowered TNF-α and IL-1β; inhibited the TLR4/MyD88/NF-κB innate-immune pathway at gene and protein level.

Why it matters: The attack-plus-nourish pairing logic again, this time with the innate immune receptor named.

A Randomized Comparative Trial on the Therapeutic Efficacy of Topical Aloe vera and Calendula officinalis on Diaper Dermatitis in Children.

Panahi Y, Sharif MR, Sharif A, et al. A Randomized Comparative Trial on the Therapeutic Efficacy of Topical Aloe vera and Calendula officinalis on Diaper Dermatitis in Children. ScientificWorldJournal 2012;2012:810234.

Study type: RCT — in infants (n=66, under 3 years)

What: Calendula ointment vs aloe vera for diaper dermatitis in babies, ten days.

Found: Both improved rash significantly; calendula left significantly fewer rash sites (p=0.001); no adverse effects in either group.

Why it matters: The best infant-safety trial data of any herbal topical we use — a randomized trial, in babies, with zero adverse events.

Phase III Randomized Trial of Calendula Officinalis Compared With Trolamine for the Prevention of Acute Dermatitis During Irradiation for Breast Cancer.

Pommier P, Gomez F, Sunyach MP, et al. Phase III Randomized Trial of Calendula Officinalis Compared With Trolamine for the Prevention of Acute Dermatitis During Irradiation for Breast Cancer. J Clin Oncol 2004;22(8):1447-1453.

Study type: RCT (phase III, n=254)

What: Calendula vs the standard cream for radiation skin damage during breast-cancer treatment.

Found: Severe dermatitis in 41% on calendula vs 63% on the comparator (p<0.001), with less pain and fewer treatment interruptions.

Why it matters: Published in oncology's flagship journal: the humble marigold salve protected skin under literal radiation better than the pharmaceutical standard.

A systematic review of Calendula officinalis extract for wound healing.

Givol O, Kornhaber R, Visentin D, et al. A systematic review of Calendula officinalis extract for wound healing. Wound Repair Regen 2019;27(5):548-561.

Study type: Systematic review (14 studies)

What: All the calendula wound-healing evidence, weighed.

Found: Consistent acceleration of the inflammatory phase and more granulation tissue in acute wounds; evidence for chronic wounds and burns mixed.

Why it matters: Calendula's lane is the acute, inflamed, healing lesion — which is exactly where we deploy it.

Wound Healing and Anti-Inflammatory Effect in Animal Models of Calendula officinalis L. Growing in Brazil.

Parente LML, Lino Júnior RdS, Tresvenzol LMF, et al. Wound Healing and Anti-Inflammatory Effect in Animal Models of Calendula officinalis L. Growing in Brazil. Evid Based Complement Alternat Med 2012;2012:375671.

Study type: Animal

What: Calendula extract in rat wounds and a blood-vessel-growth assay.

Found: More new blood vessels, less fibrin, more collagen by day 7 — and direct antibacterial activity against S. aureus.

Why it matters: The European vulnerary ("wound herb") tradition, decomposed into angiogenesis, collagen and antisepsis.

Calendula officinalis stimulate proliferation of mouse embryonic fibroblasts via expression of growth factors TGF-β1 and bFGF.

Calendula officinalis stimulate proliferation of mouse embryonic fibroblasts via expression of growth factors TGF-β1 and bFGF. Inflamm Regen 2019.

Study type: In vitro

What: Calendula's effect on fibroblasts, the skin's builder cells.

Found: Proliferation up ~65%, driven by the repair growth factors TGF-β1 and bFGF.

Why it matters: The same TGF-β repair signal Purple Cloud Ointment drives — Europe's wound herb and China's, converging on one growth factor.

A Bio-Guided Fractionation to Assess the Inhibitory Activity of Calendula officinalis L. on the NF-κB Driven Transcription in Human Gastric Epithelial Cells.

A Bio-Guided Fractionation to Assess the Inhibitory Activity of Calendula officinalis L. on the NF-κB Driven Transcription in Human Gastric Epithelial Cells. Evid Based Complement Alternat Med 2015;2015:727342.

Study type: In vitro (non-skin cells — indirect)

What: Chemical detective work: which calendula molecule carries the anti-inflammatory effect.

Found: The triterpenoid faradiol-3-myristate blocks NF-κB from binding DNA — the core inflammation switch — at ~10 µM.

Why it matters: Calendula's "cooling" has a named molecule and a named switch.

The seamy side of natural medicines: contact sensitization to arnica and marigold.

Reider N, Komericki P, Hausen BM, Fritsch P, Aberer W. The seamy side of natural medicines: contact sensitization to arnica and marigold. Contact Dermatitis 2001;45(5):269-272.

Study type: Human patch-test series — SAFETY

What: How often people are actually allergic to calendula (a daisy-family plant).

Found: About 2% of 443 patch-tested patients reacted to marigold — a weak sensitiser, but not zero.

Why it matters: This is why every topical we recommend, however gentle, comes with a patch-test-first instruction.

Progressive activation of TH2/TH22 cytokines and selective epidermal proteins characterizes acute and chronic atopic dermatitis.

Gittler JK, Shemer A, Suárez-Fariñas M, et al. Progressive activation of TH2/TH22 cytokines and selective epidermal proteins characterizes acute and chronic atopic dermatitis. J Allergy Clin Immunol 2012;130(6):1344-54.

Study type: Human skin-biopsy transcriptomics

What: Sequenced acute vs chronic eczema lesions to see how the disease changes over time.

Found: Acute lesions are Th2/Th22-driven; chronic lesions add Th1 activation and epidermal thickening — the disease shifts state as it ages.

Why it matters: This measured trajectory is the classical pattern sequence — the weeping acute (Damp-Heat) lesion maturing into the dry, thickened chronic (Blood-Deficiency/Wind-Dryness) one. Two vocabularies, one timeline.

Early-onset pediatric atopic dermatitis is TH2 but also TH17 polarized in skin.

Esaki H, Brunner PM, Renert-Yuval Y, et al. Early-onset pediatric atopic dermatitis is TH2 but also TH17 polarized in skin. J Allergy Clin Immunol 2016;138(6):1639-1651.

Study type: Human skin-biopsy study (infants/children vs adults)

What: How baby eczema differs immunologically from adult eczema.

Found: Pediatric eczema shows Th2 plus Th17 activation with barrier/lipid defects dominant — a different disease profile from chronic adult eczema.

Why it matters: Pediatric TCM has always treated infant eczema as its own pattern class (Spleen-centred, supply-side); the transcriptome agrees that babies are not small adults.

The Asian atopic dermatitis phenotype combines features of atopic dermatitis and psoriasis with increased TH17 polarization.

Noda S, Suárez-Fariñas M, Ungar B, et al. The Asian atopic dermatitis phenotype combines features of atopic dermatitis and psoriasis with increased TH17 polarization. J Allergy Clin Immunol 2015;136(5):1254-64.

Study type: Human comparative biopsy study

What: Compared eczema biology across Asian and European-American patients.

Found: Asian eczema is more IL-17-driven and "psoriasiform" — thicker, scalier, sharper-bordered — despite similar Th2 levels.

Why it matters: Eczema differs by population as well as by person. It also explains why an IL-17-suppressing ointment (indigo) earns its keep on the sharply bordered plaque.

Intrinsic atopic dermatitis shows similar TH2 and higher TH17 immune activation compared with extrinsic atopic dermatitis.

Suárez-Fariñas M, Dhingra N, Gittler J, et al. Intrinsic atopic dermatitis shows similar TH2 and higher TH17 immune activation compared with extrinsic atopic dermatitis. J Allergy Clin Immunol 2013;132(2):361-70.

Study type: Human biopsy study

What: The ~20% of eczema patients with normal IgE ("intrinsic" eczema), profiled.

Found: Same Th2 activation but higher Th17/Th22 — a distinct endotype hiding under one diagnosis.

Why it matters: More evidence that "eczema" is several diseases — which is precisely what pattern differentiation has always claimed.

Temporal shifts in the skin microbiome associated with disease flares and treatment in children with atopic dermatitis.

Kong HH, Oh J, Deming C, et al. Temporal shifts in the skin microbiome associated with disease flares and treatment in children with atopic dermatitis. Genome Res 2012;22(5):850-9.

Study type: Human longitudinal microbiome study (children)

What: Sequenced children's skin bacteria through flares and treatment.

Found: S. aureus expands sharply during flares, in proportion to severity, and recedes with treatment.

Why it matters: The weeping, crusted, malodorous flare TCM calls Damp-Heat-Toxin has a genome: it is the staph bloom, measured.

Staphylococcus aureus and Staphylococcus epidermidis strain diversity underlying pediatric atopic dermatitis.

Byrd AL, Deming C, Cassidy SKB, et al. Staphylococcus aureus and Staphylococcus epidermidis strain diversity underlying pediatric atopic dermatitis. Sci Transl Med 2017;9(397).

Study type: Human strain-level metagenomics (children)

What: Went a level deeper: which staph strains, in which children, at flare.

Found: Severe flares involve clonal takeover by single S. aureus strains; strain composition tracks and predicts severity.

Why it matters: "Resolve Toxin" has a target you can sequence.

Common loss-of-function variants of the epidermal barrier protein filaggrin are a major predisposing factor for atopic dermatitis.

Palmer CN, Irvine AD, Terron-Kwiatkowski A, et al. Common loss-of-function variants of the epidermal barrier protein filaggrin are a major predisposing factor for atopic dermatitis. Nat Genet 2006;38(4):441-6.

Study type: Human genetics

What: The discovery that filaggrin gene mutations underlie a large share of eczema.

Found: Loss-of-function filaggrin variants, carried by ~9% of Europeans, are a major independent risk factor for eczema.

Why it matters: Some eczema is constitutional — built in before birth. TCM's "Fetal Toxin" category said the same thing without a genome: the child arrived with it.

Filaggrin mutations associated with skin and allergic diseases.

Irvine AD, McLean WHI, Leung DYM. Filaggrin mutations associated with skin and allergic diseases. N Engl J Med 2011;365(14):1315-27.

Study type: Review (NEJM)

What: The definitive review of filaggrin's role in eczema and the "atopic march."

Found: The broken barrier comes first; allergens and microbes enter through it; the immune system's allergic skew follows.

Why it matters: Barrier before inflammation is the causal order — which is why nourishing and rebuilding (not just suppressing) is treatment of the root, 治本.

Sensory Neurons Co-opt Classical Immune Signaling Pathways to Mediate Chronic Itch.

Oetjen LK, Mack MR, Feng J, et al. Sensory Neurons Co-opt Classical Immune Signaling Pathways to Mediate Chronic Itch. Cell 2017;171(1):217-228.

Study type: Mechanistic (mouse + human)

What: The landmark discovery of how eczema itch actually works.

Found: The allergy cytokines IL-4, IL-13 and TSLP act directly on itch nerves — no histamine involved — which is why antihistamines so often fail; blocking the pathway relieved untreatable chronic itch in patients.

Why it matters: The migrating, antihistamine-resistant itch TCM named "Wind" is this circuit: the nervous system's share of the disease, finally mapped.

A sensory neuron-expressed IL-31 receptor mediates T helper cell-dependent itch: involvement of TRPV1 and TRPA1.

Cevikbas F, Wang X, Akiyama T, et al. A sensory neuron-expressed IL-31 receptor mediates T helper cell-dependent itch: involvement of TRPV1 and TRPA1. J Allergy Clin Immunol 2014;133(2):448-60.

Study type: Mechanistic (mouse + human)

What: Identified IL-31 — the "itch cytokine" — signalling straight to sensory nerves through the TRPV1/TRPA1 channels.

Found: T-cell-driven itch runs through nerve channels, separate from histamine.

Why it matters: TRPV1 and IL-31 are exactly where the anti-itch herbs (osthole, Ku Shen alkaloids) act — the Wind-extinguishing herbs hit the Wind circuit.

The Chinese herbal formula Huoxiang Zhengqi for atopic dermatitis with dampness pattern (CHARM): a study protocol for a double-blinded randomized controlled trial.

The Chinese herbal formula Huoxiang Zhengqi for atopic dermatitis with dampness pattern (CHARM): a study protocol for a double-blinded randomized controlled trial. Trials 2021;22(1):81.

Study type: RCT protocol (multi-centre, n=218 planned)

What: The first Western-standard randomized trial to enrol patients by a *single TCM pattern* (Dampness-pattern eczema) as an inclusion criterion.

Found: Protocol published; the trial operationalises pattern differentiation inside an RCT design.

Why it matters: The research world is beginning to test what our whole approach assumes: that the pattern, not just the herb, is the variable.