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Koj6.0

Kojic Acid – Forschung

Überwiegend Mechanismus / Beobachtung

11 begutachtete Studien

Was die Evidenz sagt

Überwiegend Mechanismus / Beobachtung

Die meisten Studien zu Kojic Acid sind mechanistisch oder beobachtend statt RCTs, die einen klinischen Effekt messen — betrachte die Ergebnisse als vorläufig.

Die meiste Evidenz stammt aus mittelwertigen Meta-Analysen und randomisierten Studien, veröffentlicht 1995–2023 mit einer typischen Studiengröße von 80 Teilnehmenden.

Basierend auf 11 Studien · 1 Meta-Analyse · 7 RCTs · 385 Teilnehmende insgesamt

Konfidenz

Mittlere Konfidenz

Nach Outcome

Skin tone & pigmentationModerate Reduktion von Melasma/Hyperpigmentierung, am stärksten in Kombination mit anderen aufhellenden Wirkstoffen (kosmetisch, kein gesundheitliches Ergebnis) · 8-12 Wochen
Überwiegend Mechanismus / Beobachtung9 Studien

Stetige Forschung

2 Studien in den letzten 5 Jahren · Neueste Meta-Analyse: 2023

199520092023

1Systematische Übersicht2019

Austin E, Nguyen JK, Jagdeo J · J Drugs Dermatol (2019)

2RCT2010

Draelos ZD, Yatskayer M, Bhushan P, Pillai S, Oresajo C · Cutis (2010)

3RCT2011

Piérard GE, Seité S, Rougier A, Quatresooz P · J Cosmet Dermatol (2011)

Quelle ansehen

4RCT2002

Hermanns JF, Petit L, Piérard-Franchimont C, Paquet P, Piérard GE · Dermatology (2002)

Quelle ansehen

5RCT2021

Al-Dhalimi MA, Yasser RH · J Cosmet Laser Ther (2021)

Quelle ansehen

6Meta-Analyse2023

Einfach gesagt: Hydroquinone (HQ) monotherapy (SMD -1.3, 95% CI [-1.6 to -1.0]), HQ-containing combination therapy (-1.4, [-1.7 to -1.1]), cysteamine (-1.6, [-2.0 to -1.2]), tranexamic acid (-1.5, [-2.0 to -1.1]), azelaic acid (-1.3, [-1.7 to -1.0]), and kojic acid (-0.9, [-1.3 to -0.5]) demonstrated comparable efficacy, while zinc sulfate did not exhibit statistically significant improvement (-1.2, [-2.7 to 0.4]).

Chang YF, Lee TL, Oyerinde O, Desai SR, Aljabban A, Bay CP, Bain PA, Chung HJ. · J Cosmet Dermatol (2023)

Pooled 45 efficacy studies (2359 patients) of topical melasma treatments using MASI standardised mean differences
Kojic acid produced a statistically significant but numerically smaller MASI reduction (SMD -0.9) than hydroquinone, cysteamine, tranexamic acid, and azelaic acid — among the weaker effect sizes
Kojic acid had a low skin-irritation incidence (5.3%), well below HQ-containing combinations (50.9%)

Quelle ansehen

7RCTn=45 · small study2009

Einfach gesagt: Trichloroacetic acid 20% showed better results than Jessner's solution as peeling agent and hydroquinone 2% with kojic acid as a topical agent in the treatment of melasma.

Azzam OA, Leheta TM, Nagui NA, Shaarawy E, Hay RM, Hilal RF. · J Cosmet Dermatol (2009)

45 melasma patients randomized to Jessner's peel, 20% TCA peel, or topical hydroquinone 2% + kojic acid over 16 weeks (MASI)
The topical hydroquinone + kojic acid arm reduced MASI but performed significantly worse than both chemical-peel arms (P=0.01 vs Jessner's; P<0.001 vs TCA)
Comparative counter-evidence: even in combination, topical kojic acid underperformed procedural peels

Quelle ansehen

8RCTn=80 · small study2013

Einfach gesagt: Kojic acid in synergy with hydroquinone is a superior depigmenting agent as compared with other combinations.

Deo KS, Dash KN, Sharma YK, Virmani NC, Oberai C. · Indian J Dermatol (2013)

80 melasma patients randomized over 12 weeks to kojic acid 1% alone, kojic acid + hydroquinone 2%, kojic acid + betamethasone, or all three (MASI-assessed)
Kojic acid combined with hydroquinone was the most effective; kojic acid monotherapy performed below the hydroquinone combinations
Directly shows kojic acid's benefit is largely realised in combination rather than standalone

Quelle ansehen

9RCTn=40 · small study1999

Einfach gesagt: More than half of the melasma cleared in 24/40 (60%) patients receiving kojic acid compared to 19/40 (47.5%) patients receiving the gel without kojic acid.

Lim JT. · Dermatol Surg (1999)

Split-face randomized design in 40 women with epidermal melasma: 2% kojic acid added to a 10% glycolic acid + 2% hydroquinone base vs the base alone
The kojic-acid side cleared more melasma (60% vs 47.5% achieving >50% clearance), and the only complete clearances occurred on that side
Benefit is incremental on top of an active hydroquinone/glycolic base, not standalone kojic acid efficacy

Quelle ansehen

10In vitro2013

Einfach gesagt: Kojic acid is 10 times more potent with an IC(50) of approximately 500 μmol/L.

Kolbe L, Mann T, Gerwat W, Batzer J, Ahlheit S, Scherner C, Wenck H, Stäb F. · J Eur Acad Dermatol Venereol (2013)

Biochemical human-tyrosinase assay plus MelanoDerm artificial-skin model comparing hydroquinone, arbutin, kojic acid, and 4-n-butylresorcinol
Confirms kojic acid's tyrosinase-inhibition mechanism (IC50 ~500 μmol/L), ~10x more potent than arbutin/hydroquinone biochemically but far weaker than 4-n-butylresorcinol
In artificial skin, kojic acid inhibited melanin only at IC50 >400 μmol/L — modest tissue-level potency, contextualizing its limited clinical effect

Quelle ansehen

11Beobachtungsstudien=220 · medium study1995

Einfach gesagt: Kojic acid is considered to have high sensitizing potential, as a comparatively high frequency of contact sensitivity was observed in patients using products containing it (5 out of 8).

Nakagawa M, Kawai K, Kawai K. · Contact Dermatitis (1995)

Patch-tested 220 women with suspected cosmetic-related contact dermatitis over one year
Of the 8 who had used kojic-acid products, 5 reacted to kojic acid and their own products; all 212 never-exposed patients tested negative
Sensitised patients developed facial dermatitis 1-12 months after starting use — a real, latency-delayed safety risk

Quelle ansehen

In der Forschungsbibliothek ansehen

Kojic Acid – Forschung

Überwiegend Mechanismus / Beobachtung

Topical Treatments for Melasma: A Systematic Review of Randomized Controlled Trials.

Evaluation of a kojic acid, emblica extract, and glycolic acid formulation compared with hydroquinone 4% for skin lightening.

Analytic assessment under ultraviolet light of actinic lentigines under bleaching treatment.

Assessment of topical hypopigmenting agents on solar lentigines of Asian women.

Evaluation of the of the efficacy of Fractional Erbium-Doped Yttrium Aluminum Garnet Laser-Assisted Drug Delivery of Kojic Acid in the Treatment of Melasma; A split face, comparative clinical study.

Efficacy and safety of topical agents in the treatment of melasma: What's evidence? A systematic review and meta-analysis.

Different therapeutic modalities for treatment of melasma.

Kojic Acid vis-a-vis its Combinations with Hydroquinone and Betamethasone Valerate in Melasma: A Randomized, Single Blind, Comparative Study.

Treatment of melasma using kojic acid in a gel containing hydroquinone and glycolic acid.

4-n-butylresorcinol, a highly effective tyrosinase inhibitor for the topical treatment of hyperpigmentation.

Contact allergy to kojic acid in skin care products.