Kojic Acid

What it does

A brightening active that blocks tyrosinase, the enzyme behind melanin, to fade the appearance of dark spots and even skin tone.

Best for

Dark spots, melasma, and post-acne marks. Effective but can be sensitizing, so it suits targeted use.

What is kojic acid?

Kojic acid is a brightening active made by fungi during fermentation. It fades the appearance of dark spots and evens tone by blocking tyrosinase, the enzyme that drives melanin production.

It is effective, but it can be more sensitizing than gentler brighteners, so it is usually used at modest strengths.

What does kojic acid do for skin?

Kojic acid reduces the appearance of dark spots and hyperpigmentation.

Kojic acid inhibits tyrosinase and is used in cosmetic preparations to reduce the appearance of hyperpigmentation.

It works well alongside gentler brighteners like alpha arbutin, and pairing it with soothing ingredients helps offset its potential to irritate. Daily sunscreen is essential, since sun exposure reverses brightening.

Who should use kojic acid?

Kojic acid suits people with stubborn dark spots or melasma who want an effective brightener and can tolerate a slightly more active ingredient. Very sensitive skin may prefer alpha arbutin first.

Frequently asked questions