Kojic Acid
Byproduct of Aspergillus fungal fermentation. Chelates copper, inhibiting tyrosinase. One of the early depigmenting agents with proven efficacy.
Evidence by route
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Several RCTs confirmed efficacy in melasma and post-inflammatory hyperpigmentation. A 2013 meta-analysis showed comparable efficacy to hydroquinone but a higher rate of contact dermatitis. In Europe, maximum concentration in cosmetics is restricted to 1%.
- Ngan V. Konjac glucomannan and kojic acid. NZ DermNet. 2005.
- Zhu W et al. J Cosmet Dermatol. 2004;3(4):177-182.
Working concentrations
1–4%
Tolerability and safety
Irritation potential
MediumAllergen risk
ModeratePregnancy
CautionFor sensitive skin
Risk of contact dermatitis with prolonged use is higher than average.
Skin types
Suitable for
Use with caution
Frequently asked questions
Is Kojic Acid safe during pregnancy?
Kojic Acid should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.
What skin types is Kojic Acid for?
Kojic Acid suits: normal, combination, oily. Use with caution in: sensitive, dry.
Can Kojic Acid irritate the skin?
Kojic Acid has moderate irritation potential. Sensitive skin may show a transient reaction that usually settles with adaptation.