Compatibility of Ethyl Ascorbic Acid and Niacinamide

You asked if Ethyl Ascorbic Acid can be mixed with Niacinamide for improving skin even tone, referencing a Garnier product that appears to contain both.

Based on the information available for the specific ingredients, the description for Ethyl Ascorbic Acid (3-O-ethyl ascorbic acid, Vitamin C Ethyl Ether) explicitly states that it should not be used in formulas containing Vitamin B3 (Niacinamide) or Zinc PCA. This suggests a potential incompatibility or stability issue when directly combining these ingredients in a formulation using this particular form of Ethyl Ascorbic Acid.

While some commercial products might contain both ingredients, they may use specific forms, encapsulation technologies, or formulation techniques to ensure stability and efficacy that might not be achievable with simple mixing of raw materials.

Both ingredients are known for their benefits in improving skin tone:

• Ethyl Ascorbic Acid is a stable Vitamin C derivative known for its skin brightening effects by reducing melanin production and helping to fade existing dark spots.
• Niacinamide (Vitamin B3) is well-regarded for its ability to reduce hyperpigmentation, improve skin tone, strengthen the skin barrier, and reduce redness.

If you are formulating, it is recommended to follow the supplier's guidelines regarding compatibility. Based on the product information for Ethyl Ascorbic Acid, it is advised to avoid combining it with Niacinamide.