Ascorbyl Tetraisopalmitate is an oil-soluble derivative of Vitamin C that can be used in higher concentrations without drawbacks,Ascorbyl Tetraisopalmitate is one of the most stable derivatives of Vitamin C. Except the general benefits of pure Vitamin C, Ascorbyl Tetraisopalmiate has been shown to offer specific skin brightening benefits.Comparing the pure Vitamin C Ascorbic Acid,Ascorbyl Tetraisopalmitate will not exfoliate or irritate the skin. It is well tolerated by even the most sensitive skin types. Also unlike regular Vitamin C , it can be used in high doses, and for up to eighteen months without oxidizing.Ascorbyl Tetraisopalmitate is the tetraester of Ascorbic Acid and Isopalmitic Acid. it is a clinically proven, stable, oil-soluble vitamin c derivative that provides superior percutaneous absorption and effectively converts to free vitamin c in the skin. this multi-functional ingredient inhibits the activity of intracellular tyrosinase and melanogenesis to brighten, reduces uv-induced cell or DNA damage, provides potent antioxidant functionality, and boosts collagen synthesis.