Magnesium Ascorbyl Phosphate
Stable water-soluble vitamin C derivative. Weaker antioxidant activity than L-ascorbic acid, but it spares sensitive skin and works at neutral pH.
Evidence by route
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
At 3–10% it converts in the skin to ascorbic acid, gently brightens and supports collagen synthesis. Weaker than L-AA but more resistant to oxidation.
- Kameyama K et al. J Am Acad Dermatol. 1996;34(1):29-33.
- Pinnell SR. J Am Acad Dermatol. 2003;48(1):1-19.
Tolerability and safety
Irritation potential
LowAllergen risk
LowPregnancy
SafeSkin types
Suitable for
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Combinations with other ingredients
Works well with
RetinolРетинол
MAP is stable at neutral pH, so there is no pH conflict with retinol. On sensitive skin this pair tolerates better than L-AA + retinol: no need to alternate.
RetinaldehydeРетиналь
MAP works gently at neutral pH, so it is compatible with retinal. A good choice for sensitive skin that cannot tolerate L-AA plus a retinoid in one routine.
Frequently asked questions
Is Magnesium Ascorbyl Phosphate safe during pregnancy?
Magnesium Ascorbyl Phosphate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Magnesium Ascorbyl Phosphate for?
Magnesium Ascorbyl Phosphate suits: normal, dry, oily, combination, sensitive.
What is Magnesium Ascorbyl Phosphate and what does it do in cosmetics?
Stable water-soluble vitamin C derivative.
What's the INCI name for Magnesium Ascorbyl Phosphate?
The INCI name is Magnesium Ascorbyl Phosphate. It may also appear as: MAP, Магний аскорбил фосфат, MAP витамин С.