Vitamin C - Magnesium Ascorbyl Phosphate

Rated 4.7 out of 5
Based on 6 reviews
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Magnesium Ascorbyl Phosphate (MAP) is a stable, water soluble derivative of Vitamin C, it does not readily degrade in formulas containing water.  It is also considered light-stable and oxygen-stable.

Studies of MAP in aqueous solutions have indicated that it retains over 95% of its potency at 40°C without any pH adjustment.

MAP is capable of suppressing skin pigmentation by inhibiting Tyrosinase activity thus making it effective in whitening dark skin, or areas of dark skin.  However, it has been suggested that concentrations of up to 10% may be required to be effective at inhibiting melanin production.

MAP appears to have the same potential to boost skin collagen synthesis as does Ascorbic Acid, but at lower concentrations. As such, it may be the preferred choice for those with sensitive skin or those wanting to avoid the exfoliating effects of highly acidic Ascorbic Acid.


  • Magnesium Ascorbyl Phosphate (MAP) may discolor in formulations with a pH below 6, use in emulsion based products with a pH between 5-7.
  • The solubility of MAP in water is up to 15.4% at 25°C 
  • MAP is stable at 80°C for up to 20 hours so it can be added to the water phase prior to heating.
  • You can also predisperse it in a small amount of distilled water and add at the end of the formulation process.
  • If you're having trouble dissolving MAP in water, warming the solution to about 40°C (104°F) will help.

This product is for external use only, it is not intended for use as a nutritional supplement.


INCI Magnesium Ascorbyl Phosphate 
CAS Number 113170-55-1
Potential Applications Creams, lotions, makeup, after sun care products
Usage 0.2-3%, for skin ligtening up to 10%
Solubility Water Soluble (mix well, allow time for lumps to dissolve)
Palm Free Yes
Vegan   Yes
Tested on animals No
Contains GMO No
Country of origin China
Documents SDS


average rating 4.7 out of 5
Based on 6 reviews
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6 Reviews
Reviewed by Sayaka W.
Verified Buyer
Rated 3 out of 5
Review posted

Doesn't easily dissolve

It took a very, very long time to dissolve in water. Have been using it for a few weeks now, haven't seen any noticeable difference but will keep using it and see.

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Reviewed by Abigail J.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Sensitive Skin Savior

I have incredibly sensitive skin and basically swell up if I even say the words "L-ascorbic acid." Every single time I tried to use vitamin C in the L-ascorbic form I ended up with HORRENDOUS consequences. I'm talking swelling for almost a week. I found out about MAP and thought I'd give it one more try. Long story short, I will shout my love for this product from the rooftops. Finally, a vitamin C I can use!! I've been using it for about a month now and obsessed with the results.

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Reviewed by Shirley S.
Verified Buyer
I recommend this product
Rated 5 out of 5
Review posted

Love this

Great for oil formulations

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