Sodium Ascorbyl Phosphate (SAP) is a naturally occurring water-soluble derivative of Vitamin C. It’s the most stable form of Vitamin C, meaning it won’t oxidize and go bad in a couple months, making it a preferable choice for cosmetic formulations. It’s more stable and bioavailable than Magnesium Ascorbyl Phosphate (MAP), Ascorbyl Palmitate, and Ascorbic Acid (among other Vitamin C derivatives).Unlike it’s …