Sodium Ascorbyl Phosphate

Sodium Ascorbyl Phosphate is a stable, water-soluble form of vitamin C, which was designed to beat the instability problems linked to the pure ascorbic acid. Vitamin C is an renowned antioxidant which increase collagen production and takes part in skin brightening. Nevertheless, ascorbic acid is highly unstable and might deteriorate easily into cosmetic formulations. For solving this dilemma, derivatives like SAP have been synthesized. SAP is much more stable than AA, and it works well up to pH 7; once absorbed into the skin, it can be converted into its active form-asccountic acid-to exert the same skincare benefits.

Despite the stability issue, one of the major concerns about SAP is that it has relatively lower skin penetration compared to pure AA. However, it has been demonstrated that SAP exerts antioxidant activity, though much weaker compared to AA; it also has established stimulation of collagen synthesis to give good skin lightening by reducing dark spots. Being less potent than other vitamin C derivatives, such as Magnesium Ascorbyl Phosphate, SAP is nonetheless effective in improving skin tone and texture.
While it is a weaker cousin to pure AA, SAP nonetheless is an exciting and stable derivative of vitamin C, boasting both antioxidant and brightening properties in skincare applications.