Kojic Acid – Cosmetic Uses in Skin Brightening and Pigmentation Care
What Is Kojic Acid?
Kojic Acid, chemically known as 5-hydroxy-2-hydroxymethyl-4-pyrone, is a chelating agent produced by several species of fungi, particularly Aspergillus oryzae. It is also a by-product of the fermentation of malted rice during sake production.
In cosmetics, Kojic Acid has traditionally been used as a skin-whitening and depigmenting ingredient. It is also described as having antioxidant, antibacterial, and antifungal properties.
Cosmetic Applications
Kojic Acid is primarily used in skin care products formulated to improve the appearance of uneven pigmentation and dark spots.
Its cosmetic use is based largely on its ability to interact with tyrosinase, an enzyme involved in melanin production. Kojic Acid can chelate copper at the active site of tyrosinase, thereby inhibiting its activity.
It can therefore be found in formulations such as:
- Pigmentation and dark-spot treatments
- Skin-brightening creams and serums
- Facial skin care products
- Products formulated for uneven skin tone
The source notes that visible effects may take several weeks or months to develop.
Safety Considerations
Kojic Acid requires particular attention during formulation because of its potential to cause skin sensitisation. The original source reports that human sensitisation has been observed.
Ingredient Information
INCI: Kojic Acid
Chemical Name: 5-Hydroxy-2-hydroxymethyl-4-pyrone
Function: Antioxidant
References
Dweck, Anthony. Handbook of Natural Ingredients (Dweck Books 4) . Dweck Data.
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