Magnesium Ascorbyl Phosphate 10% — Reddit Reviews
by The Ordinary
Updated October 21, 2026
10% magnesium ascorbyl phosphate offers gentler tolerance; patch-test first.
What the community says
A 10% magnesium ascorbyl phosphate formula gives sensitive users a gentler, stable derivative to try. The catch: one community tester developed a large, red, itchy, painful welt, so patch-testing is non-negotiable.
What this means for you
Backed by 3 threads from r/scacjdiscussion, r/30PlusSkinCare and 1 more.
Read the threads ↓What people love
Watch out for
Product details
Skin Type
Product Traits
Key Ingredients
Skin type data limited
Where to buy
What the science says
Hyperpigmentation
Some evidence
Vitamin C: 9 studies tested it directly. See all 19 studies
What the studies found
- Most studies found vitamin C helped fade dark patches, especially in melasma
- It faded melasma better than a placebo when put on the skin
- It often worked about as well as other common options for melasma
- It improved results when used with procedures like microneedling, sound waves, or acid peels
- The most common side effects were mild and brief irritation
Studied at 3–30%this product: 10%
Anti-Aging
Some evidence
Vitamin C: 4 studies tested it directly. See all 12 studies
What the studies found
- All 4 studies that tested it on its own found it helped with signs of aging
- It improved wrinkles, including crow’s-feet, and made skin feel smoother
- It improved the look and texture of sun-damaged skin
- Some studies found it improved skin tone and lightened skin
- No irritation or sensitivity was reported in one study
Studied at 5–10%this product: 10%
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
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
