Kojic Acid

Skin-lightening agent that inhibits melanin production. Kojic acid inhibits melanogenesis by acting as a competitive inhibitor of tyrosinase, the key enzyme in melanin synthesis. It achieves this by chelating the copper atom at the enzyme's active site, thereby blocking the hydroxylation of L-tyrosine to L-DOPA and the subsequent oxidation of L-DOPA to dopaquinone, which are critical steps in melanin formation. This reduction in melanin production leads to a skin-lightening effect.

The CIR Expert Panel concluded that kojic acid is safe in rinse-off products and safe at concentrations up to 1% in leave-on products. It has a notable potential for inducing allergic and irritant contact dermatitis, particularly at higher concentrations or in leave-on formulations.

Look for products with 1-4% (most leave-on formulations use 1-2%, while concentrations up to 3% are used in rinse-off products). for clinical efficacy.

Use Kojic Acid with General guidance carefully. Kojic acid increases photosensitivity. Best used at night, but okay in AM with strong SPF.

Kojic Acid can be used with Niacinamide. Kojic acid and niacinamide are a gentle brightening duo. Kojic acid inhibits tyrosinase while niacinamide blocks melanosome transfer — complementary pathways with no conflict.

Kojic Acid can be used with Vitamin C. Kojic acid and vitamin C both target hyperpigmentation through different mechanisms and are safe to layer together for a stronger brightening effect.