Sodium Ascorbyl Phosphate – A Stable Form of Vitamin C

Sodium Ascorbyl Phosphate (SAP) is a water-soluble, stabilized form of Vitamin C. It is valued in skincare for its stability, antioxidant support, and compatibility with a variety of formulations.

Discovery & Manufacturing

SAP was developed as a more stable alternative to ascorbic acid, which is prone to oxidation. It is produced by combining Vitamin C with phosphate and sodium salts, making it resistant to degradation and ideal for water-based serums and creams.

Today, SAP is manufactured globally, with production hubs in Europe, Japan, China, and the United States.

Chemical Structure & Function

SAP is a derivative of Vitamin C that converts to active ascorbic acid when applied to the skin. Its phosphate bond improves stability, while still providing the antioxidant and skin-supportive benefits associated with Vitamin C.

Property	Description
Stability	More stable than pure Vitamin C (ascorbic acid); resists oxidation in formulas
Solubility	Water-soluble; ideal for serums, gels, and creams
pH Range	Stable at pH 6–7; less irritating than low-pH Vitamin C formulas
Main Benefits	Antioxidant support, helps brighten skin, supports barrier health

Fun Facts About Sodium Ascorbyl Phosphate

Fun Fact #1

SAP is considered one of the most stable Vitamin C derivatives, making it easier to formulate without rapid oxidation.

Fun Fact #2

Unlike pure ascorbic acid, SAP works well in water-based serums without requiring a very low pH.

Fun Fact #3

SAP is often paired with antioxidants like Vitamin E and Ferulic Acid for a boosted protective effect.

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