Follow us on our new Insta page »

Magnesium Ascorbyl Phosphate

Also-called-like-this: Form of Vitamin C, MAP
What-it-does: skin brightening


A form of skincare superstar, Vitamin C. If you do not know, what the big deal about Vitamin C is, click here and read all about it, we will wait here for you. 

So now you know that pure vitamin C (aka ascorbic acid, AA) is really unstable and hard to formulate so the cosmetics industry is coming up with a bunch of derivatives to solve the problem and Magnesium Ascorbyl Phosphate (or MAP) is one of them.  

MAP does solve the stability problem: it's stable up to pH 7, so far so good. What is not so good is that, as the great review study about vitamin C derivatives in the Journal of Cosmetic Dermatology writes, MAP is "at very best, poorly absorbed in comparison to AA." 

Moreover,  derivatives not only have to be absorbed into the skin, they also have to be converted into pure AA. The good news is that in-vitro data shows that MAP does convert, but the bad news is we do not really know if the same is true on real, living human skin. Even if it does, we don't know how good the conversion rate is (but to be fair the same is true for all other derivatives).

Regarding the three magic abilities of pure vitamin C (antioxidant, collagen booster, skin brightener), there is no published data about MAP's antioxidant or photoprotection capabilities. We have better news about the other two things: in-vitro data shows that MAP can boost collagen synthesis similar to AA (though in the case of AA it's proven in-vivo) and even better, MAP is proven to work as a skin brightener in-vivo (on real people). 

Bottom line: when it comes to vitamin C derivatives, MAP is definitely an option. We especially recommend it if you are after skin brightening as this seems to be the strongest point of MAP. 


Show me some proof

  • Journal of Cosmetic Dermatology, Volume 11 (4) – Dec 1, 2012, Stability, transdermal penetration, and cutaneous effects of ascorbic acid and its derivatives

Products with a known amount of Magnesium Ascorbyl Phosphate

Other products with Magnesium Ascorbyl Phosphate

100% Pure Sérum De Noche Multi-Vitamin + Antiox Circadia Vitamin C Reversal Serum Dermalogica Map-15 Regenerator Diadermine Lift+ Revitalisierender Vitamin C Booster Hada Labo Shirojyun Deep Whitening Cream Le Mieux Vita-C Serum Timeless Hyaluronic Acid Vitamin C Serum Andalou Naturals Turmeric + C Enlighten Serum Hada Labo Shirojyun Premium Whitening Emulsion Hada Labo Shirojyun Premium Whitening Lotion Light Image Vital C Hydrating Anti-Aging Serum The Ordinary Magnesium Ascorbyl Phosphate 10% it Cosmetics Bye Bye Pores Poreless Finish Airbrush Powder Skin Actives Antioxidant Serum Ausceuticals Vitamin B Serum DrGL Moisturiser All Skin Types Lanocreme Brightening Face Mask QUALITY 1ST All In One Sheet Mask Skin Actives Collagen Serum Skinlex 2% Alpha-Arbutin Serum CNP Laboratory Vita-Solution Whitening Ampule Glowbiotics Ultimate Youth Restoring Serum Hada Labo Shirojyun Clear Lotion OZNaturals Vitamin C + Aha Facial Serum Skin Inc. My Daily Dose Yeouth Hyaluronic Acid Cream With Vitamin C, Vitamin E, Ferulic Acid, Tripeptide 31 Youth To The People Age Prevention Serum Cleanbeauty Skin Resurfacing Facial Serum Corpa Flora Caviar Rouge Youth To The People Superfood Firm And Brighten Serum silk naturals Super Defense Serum Andalou Naturals Cannacell D.Tox Mask Avalon Organics Intense Defense Oil-Free Moisturizer DCL C Scape Enzymatic Gel Cleanser Dmk Beta Gel Environ Retinol Serum 1 Environ Retinol Serum 3 Michael Todd Beauty Hyaluronic Acid + C Serum Pixi Retinol Tonic Swisse Blood Orange Brightening Clay Mask BeautyRX Triple Vitamin C Serum Cannacell Hydrating Toner Le Mieux Rx Complex Serum Priori DNA fx221 Recovery Serum Volition Oceanene Youth-Boost Gel Andalou Naturals Luminous Eye Serum Dr. Jart+ Water Drop Hydrating Moisturiser Ellana Loose Mineral Foundation (Chai Tea Latte) First Aid Beauty Fab Skin Lab Retinol Serum 0.25% Pure Concentrate Juice Beauty Spf 30 Oil-Free Moisturizer