Sodium Ascorbyl Phosphate

Water-soluble stable vitamin C derivative. Skin phosphatase releases active ascorbic acid. Active at pH 7 – does not require acidic pH.

Brightening Acne Protection

Evidence by route

Topical application

Limited evidence. One RCT or several controlled studies with limitations.

Clinical studies confirm antimicrobial activity in acne (via C. acnes suppression) and brightening effect. Anti-aging evidence is weaker than for L-ascorbic acid. The advantage is formula stability and gentleness.

Klock J et al. Skin Pharmacol Physiol. 2005;18(3):132-138.

Working concentrations

1–5%

Tolerability and safety

Irritation potential

Low

Allergen risk

Low

Pregnancy

Safe

Skin types

Suitable for

SensitiveOilyCombinationNormalDry

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Combinations with other ingredients

Works well with

RetinolРетинол

SAP works at neutral pH and does not conflict with retinol. Compatibility is clinically confirmed: brands often combine them in a single anti-aging serum without loss of activity.

Frequently asked questions

Is Sodium Ascorbyl Phosphate safe during pregnancy?

Sodium Ascorbyl Phosphate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.

What skin types is Sodium Ascorbyl Phosphate for?

Sodium Ascorbyl Phosphate suits: sensitive, oily, combination, normal, dry.

What is Sodium Ascorbyl Phosphate and what does it do in cosmetics?

Water-soluble stable vitamin C derivative.

What's the INCI name for Sodium Ascorbyl Phosphate?

The INCI name is Sodium Ascorbyl Phosphate. It may also appear as: SAP, Натрия аскорбилфосфат.

What concentration of Sodium Ascorbyl Phosphate is effective?

1–5%

Published: April 13, 2026 · updated: May 17, 2026