Magnesium Ascorbyl Phosphate
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INCI: MAP
Reviewed by Emma · Last updated 18 Aug 2026
Also known as: vitamin C, ascorbic acid
Stable, water-soluble Vitamin C for sensitive skin
At a glance
Addresses
EWG Safety Score
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What Is Magnesium Ascorbyl Phosphate?
Magnesium Ascorbyl Phosphate (MAP) is a stable, water-soluble derivative of Vitamin C that has been extensively studied for its skin benefits. Unlike pure ascorbic acid, MAP remains stable at higher pH levels and does not cause the stinging or irritation often associated with traditional Vitamin C serums.
This gentle yet effective antioxidant is converted to ascorbic acid within the skin, where it provides brightening and protective benefits. Its excellent tolerability makes it ideal for those with sensitive or reactive skin who cannot use L-ascorbic acid formulations.
Benefits for Your Skin
Clinical Evidence & References
- International Journal of Biological Macromolecules, January 2021, pages 333-341
- The Journal of Clinical and Aesthetic Dermatology, July 2017, pages 14-17; and July 2010, pages 20-31
- Annals of Dermatology, February 2016, pages 129-132; and August 2015, pages 376-382
- International Journal of Dermatology, January 2014, pages 93-99
- Indian Dermatology Online Journal, April-June 2013, pages 143-146
- Skin Research and Technology, August 2008, pages 376-380
- International Journal of Toxicology, Supplement 24, 2005, pages 51-111
How widely it's used
Regulatory information
Standardised cosmetic-ingredient identifiers used by regulators.
Show identifiers
- INCI Name
- MAGNESIUM ASCORBYL PHOSPHATE
- Function
- Antioxidant, Skin Conditioning
Frequently Asked Questions
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