Cosmetics Formulation Development

making serum recipe วิตซี would like to ask the team if they can use วิตามินซี 2 types of 10% each can be used as ingredients? Is it too harsh on the face? 1. Ethyl Ascorbic acid 10% 2. Perfect-C™ (Ascorbyl Tetraisopalmitate) 10%

Hello, although it can be used, but it is not recommended because the performance may not be higher. when used in higher doses than necessary (Using at a rate lower than half this can be equally effective) Vitamin C both types do not irritate the skin. So you don't have to worry about irritation.