Sodium Ascorbyl Phosphate Sodium L-Ascorbic acid -2-phosphate SAP

Name: Sodium ascorbyl phosphate

Chemical name：Sodium L-Ascorbic acid -2-phosphate 

CAS#: 66170-10-3

Molecular formula：C₆H₆O₉Na₃

Molecular weight：322.05

Appearance: White or almost white crystalline.

Assay：≥95%（HPLC）

• Stable, water-soluble derivative of ascorbic acid (vitamin C)

• Helps reduce signs of aging and hyperpigmentation

• Enzymes in skin convert this ingredient to pure vitamin C

• Doesn’t require a low pH range to be effective

• Works well with other forms of vitamin C and vitamin E

Sodium ascorbyl phosphate (SAP, for short) is a stable, water-soluble form of vitamin C made from combining ascorbic acid with a phosphate and a salt, compounds which work with enzymes in skin to cleave (split) the ingredient and release pure ascorbic acid, which is the most researched form of vitamin C.

ust like pure vitamin C, sodium ascorbyl phosphate functions as an antioxidant on and within skin. When used in higher amounts, it can be effective for brightening a dull skin tone, smoothing wrinkles, visibly firming skin, and reducing discolorations.

The usual concentration of sodium ascorbyl phosphate in skin care ranges from 0.2-3%, an effective range to help improve skin’s environmental defenses and target lines and wrinkles, especially when paired with oil-soluble vitamin E for antioxidant synergy that improves the stability of both ingredients.

A 5% concentration of sodium ascorbyl phosphate was shown in a comparative study with the same amount of ascorbic acid to have equivalent wrinkle-smoothing and elasticity-increasing benefit to skin around the eyes.

Amounts above 3% are considered necessary to target discolorations, similar to the range research has shown ascorbic acid works within to target this concern.