Moogoo Ascorbyl Tetraisopalmitate (Vitamin C) in Squalene - 25mLDescription We made this serum by dissolving an oil soluble form of Vitamin C called Ascorbyl Tetraisopalmitate, through a base of hydrating antioxidant oils that mimic the skin's own sebum. This means that its easily absorbed into the skin, getting the goods right where you want them. Inferior water soluble forms of Vitamin C dont penetrate well into the skin and this form is the most expensive because it is the most stable, but worth it for the