Kojic acid (5-hydroxy-2-hydroxymethyl-4-pyrone) is a common ingredient found in skincare products that target hyperpigmentation. It is used in cosmetic products such as creams, cleansers, soaps and serums.
- CAS NO: 501-30-4
- Appearance: White crystals
- MF: C6H6O4
- INCI: Kojic acid
How safe is Kojic Acid?
The acid is relatively safe as long as it is handled by well trained personnel.
- Skin-lightening effect by inhibiting melanin formation
- Promotes skin lightening and helps establishing an even skin tone on all skin types
- Minimizes liver spots
- Often used also to preserve or stabilize colors in cosmetic products
- Can enhance shelf life through its preservative actions against chemical and microbial degradation
Kojic acid in formulation
- In formulation, kojic acid works at overall optimum pH of 4.5-6. An alkaline pH environment would make the entire formulation highly unstable.
- It is insoluble in lipids but soluble in water.
- It should therefore be added to the water phase of the formulation.
- Ensure that the water is warm. Adding kojic acid to hot water will make it less potent and more prone to oxidization.
- Recommended concentration Percentage: 1-3%
In formulation, kojic acid works at overall optimum pH of 4
Why we love Kojic Acid
- It has preservative properties.
- Has anti-aging properties
- It inhibits tyrosinase acticity.
- Plays a role in fading skin hyperpigmentation.
- It also antibacterial and anti-fungal effects.
If formulating for commercial sale, it is important to have the formulating company approved by relevant authorities in the specific country. Precautions should also be indicated on label.
An example of such precautions is: “Avoid contact with eyes, nose and other internal areas of the body. Product should be kept out of the reach of children. If ingested or injected, seek help immediately!”
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