Kojic Acid

Description

Kojic acid is a naturally occurring compound produced by various fungi during the fermentation process of certain foods, particularly in the production of sake. It is primarily known for its skin-lightening properties and is widely used in cosmetic formulations to reduce hyperpigmentation, dark spots, and uneven skin tone. Kojic acid is also recognised for its antioxidant properties, contributing to overall skin health.

Benefits

• Skin Brightening: Kojic acid inhibits the enzyme tyrosinase, which plays a crucial role in melanin production, effectively reducing dark spots and promoting a more even skin tone.
• Antioxidant Properties: It helps neutralise free radicals, protecting the skin from oxidative stress and premature aging.
• Anti-inflammatory Effects: Kojic acid can soothe irritated skin and reduce redness, making it beneficial for sensitive skin types.
• Antimicrobial Activity: It has been shown to possess antifungal properties, which can help in the treatment of certain skin conditions.

Uses

• Cosmetic Products: Commonly found in serums, creams, lotions, and soaps aimed at treating hyperpigmentation, melasma, and sunspots.
• Skincare Treatments: Used in peels and masks for its brightening and exfoliating effects.
• Food Industry: Occasionally used as a food preservative and colourant, particularly in the production of some fermented foods.

Physical + Chemical Properties 

• Chemical Formula: C₁₀H₁₂N₂O₄
• Appearance: White to pale yellow crystalline powder
• Molecular Weight: 198.22 g/mol
• Solubility: Soluble in alcohol and slightly soluble in water. It is stable in acidic conditions but may degrade in alkaline environments.
• pH: Typically ranges from 4 to 5 when dissolved in water.

Caution 

Skin Sensitivity: Kojic acid may cause skin irritation or allergic reactions in some individuals. A patch test is recommended before extensive use.

Stash It Right 

• Conditions: Store in a cool, dry place away from direct sunlight and moisture. Keep the container tightly closed to prevent contamination and maintain product integrity.
• Temperature: Ideal storage temperature is between 15 °C and 30 °C (59 °F and 86 °F)