Magnesium Ascorbyl Phosphate – Gentle, Stable Vitamin C

Magnesium Ascorbyl Phosphate (MAP) is a water-soluble, stabilized form of Vitamin C. Known for its gentle profile and antioxidant support, it’s often used in brightening and hydrating skincare formulas.

What It Is & How It’s Made

MAP is produced by combining ascorbic acid with magnesium phosphate, creating a more stable derivative of Vitamin C. It resists oxidation better than pure ascorbic acid, making it easier to formulate in water-based products.

Today, MAP is widely produced in Japan, China, Europe, and the United States for use in skincare and cosmetic products.

Chemical Nature & Function

MAP is a phosphorylated ester of Vitamin C that converts to active ascorbic acid once absorbed. Its water solubility makes it a good fit for serums and creams, especially in formulas designed for sensitive skin.

Property Description
Solubility Water-soluble; works in serums, gels, and lotions
Stability More stable than pure Vitamin C in water-based formulas, but less potent
pH Range Best at pH 6–7; less irritating than low-pH Vitamin C solutions
Main Benefits Gentle brightening, antioxidant protection, hydration support
Skin Suitability Well tolerated by sensitive skin types

Formulator Tips

  • Best used in leave-on serums and light emulsions at 1–10% depending on formulation goals.
  • Pairs well with hyaluronic acid for hydration and niacinamide for barrier support.
  • Protect formulas from high heat to maintain MAP stability.

Fun Facts About Magnesium Ascorbyl Phosphate

Fun Fact #1
MAP is considered one of the most gentle Vitamin C derivatives, making it ideal for sensitive skin formulations.
Fun Fact #2
MAP is water-soluble and doesn’t need a low pH, unlike ascorbic acid, so it feels milder on the skin.
Fun Fact #3
Although gentler, MAP still provides antioxidant protection and mild brightening when used consistently.

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