The most stable form of vitamin C, pure 3-O-Ethyl ascorbic acid, and the Australian superfruit Kakadu plum are the two sources of vitamin C that power our radiance-boosting Vitamin C Gel Face Wash. Three clinically demonstrated benefits of vitamin C include as an antioxidant, a collagen builder, and a brightener. The issue: After a few months, vitamin C loses its effectiveness due to oxidation, which turns it brown. However, a fix exists! A new generation of very stable vitamin C derivative, pure 3-O-Ethyl ascorbic acid has great brightening properties.