Beauty Encyclopedia›Sodium Ascorbyl Phosphate

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Sodium Ascorbyl Phosphate

Also known as: SAP, Stable Vitamin C

Generally SafeantioxidantEWG: 1

A stable, gentle Vitamin C derivative that converts to active ascorbic acid on skin.

How it works

Sodium Ascorbyl Phosphate is a water-soluble Vitamin C salt that is stable at near-neutral pH, making it suitable for sensitive skin formulations. Skin phosphatases convert it to free ascorbic acid. Research suggests it has particular efficacy against acne-causing bacteria in addition to its antioxidant and brightening properties.

Concentration note

Effective at 1–3%. Studies show acne benefit at 1%.

Best for

Sensitive skinAcne-prone skinBeginners to Vitamin CBrightening

Commonly found in

Brightening serumsAcne treatmentsDaily SPF moisturizers

✅ Pairs well with

NiacinamideHyaluronic AcidGlycerin

Safety & restrictions

No known safety concerns. More stable and less irritating than L-Ascorbic Acid.

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For informational purposes only. Not medical advice. Consult a dermatologist for personalised guidance.