Magnesium Ascorbyl Phosphate 10% — Reddit Reviews
by The Ordinary
Updated September 2, 2026
Gentle 10% vitamin C derivative favored by sensitive skin; allergic reactions possible.
What the community says
A 10% magnesium ascorbyl phosphate vitamin C derivative that's gentler than ascorbic acid and preferred by many sensitive skin users. It converts to ascorbic acid inside the skin but can cause allergic reactions, so patch testing is crucial. Not ideal for those prone to irritation.
What this means for you
Backed by 3 threads from r/scacjdiscussion, r/30PlusSkinCare and 1 more.
Read the threads ↓What people love
- Gentler vitamin C derivative great for sensitive skin
- Stable and water-soluble form of vitamin C that layers well
- Effective at 10% concentration without harshness of L-AA
Watch out for
- Can cause allergic reactions and redness; patch test first
- Weaker antioxidant potency compared to L-ascorbic acid
- Not sufficient for users needing strong vitamin C effects
Product details
Skin type data limited
Where to buy
Real Reddit threads — 7 mentions across 3 threads
The Ordinary Magnesium Ascorbyl Phosphate 10% on Reddit, in one place — 3 threads from r/scacjdiscussion, r/30PlusSkinCare and 1 more, summarized.
“Magnesium Ascorbyl Phosphate 10%: I thankfully patch-tested this before using it on my face”
Cautionary
“it left me with a large, red, itchy, painful welt on the back of my hand”
Cautionary
“I must have had an allergic reaction to the ingredients”
Cautionary
“I personally have been using The Ordinary MAP for a long while and my skin does well with it.”
Positive
“Higher strength doesn't mean better.”
Positive
“If you have sensitive skin, you really want to start low and slow to see how your skin will react.”
Positive
“You might switch to MAP Vitamin C, magnesium Ascorbyl phosphate which is a weaker derivative”
Mentioned
“which is a weaker derivative that turns into ascorbic acid in the skin but is more gentle.”
Mentioned
“Vitamin C tears me up on taz”
Mentioned
