This light weight serum also contains hyaluronic acid and Vitamin B5 to hydrate and sooth. Skin Type Indications: All skin types. Benefits • Magnesium ascorbyl phosphate appears to have the same potential as other forms of Vitamin C, to boost skin collagen synthesis, but is effective in significantly lower concentrations • Magnesium ascorbyl phosphate is converted to natural acid Vitamin C in the skin • Vitamin C is also a potent antioxidant