Vitamin C (Tetrahexyldecyl Ascorbate) ELMW Hyaluronic Face Serum, 100ml Our blend of Brazilian acerola fruit extracts and vitamin C helps achieve a brighter, younger complexion. We chose an ultra-stable oil-soluble form of vitamin C for increased effectiveness and improved skin comfort. Ascorbyl teraisopalitamitamitamitan vitamin exhibits superior skin penetration power, with 1% equivalent to about 10% pure ascorbic acid. This serum has been balanced according to the pH of the skin and is therefore suitable for all skin types, including sensitive skin.