What it is
Disodium Ascorbyl Sulfate is a salt form of ascorbic acid in which the vitamin C molecule is sulfated and paired with sodium, improving its stability relative to pure ascorbic acid. It is used in formulas as a more stable, water-soluble vitamin C derivative that can function as an antioxidant. It appears in sunscreens and other leave-on skincare products.
Safety & warnings
As a stabilized vitamin C derivative, it is generally well tolerated and tends to be gentler than pure ascorbic acid, which can be irritating at low pH. It is water soluble and not associated with comedogenicity.
Origin & sourcing
Synthetic derivative; produced by chemically modifying ascorbic acid (vitamin C) into its sulfate ester and forming the disodium salt.
Questions everyone asks
Is Disodium Ascorbyl Sulfate a form of vitamin C?
Yes. It is a stabilized, water-soluble derivative of ascorbic acid used for its antioxidant and skin-conditioning properties.
Why use a vitamin C derivative instead of pure vitamin C?
Derivatives like this are more stable in formula and tend to be gentler on the skin than pure ascorbic acid.