Vitamin C12 Serum — Reddit Reviews
Updated October 10, 2026
12% L-ascorbic acid serum for brightness and daytime glow; strong and stingy.
What the community says
A morning vitamin C serum with ascorbic acid, glycerin, dimethicone, sodium hyaluronate, and salicylic acid. People use it for brightness and dark spots, but the alcohol, fragrance, and acid load can sting reactive skin.
What this means for you
What people love
- Brightening glow with real fan-club energy
- 12% L-ascorbic acid plus salicylic acid
- Has glycerin, sodium hyaluronate, and dimethicone
Watch out for
- Strong enough to sting or irritate sensitive skin
- Alcohol denat and fragrance add extra irritation risk
- Can be too much alongside tretinoin or azelaic acid
Product details
Skin type data limited
Where to buy
What the science says
Hyperpigmentation
Some evidence
Vitamin C: 9 studies tested it on its own. See all 20 studies
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 16 mentions across 3 threads
La Roche-Posay Vitamin C12 Serum on Reddit, in one place — 3 threads from r/30PlusSkinCare and r/SkincareAddiction, summarized.
“- LaRoche vitamin C12 serum”
Positive
“☀️Morning:”
Positive
“LaRoche vitamin C12 serum”
Positive
“La Roche-Posay Pure Vitamin C12 Serum (12% L-Ascorbic Acid, Salicylic Acid)”
Mentioned
“OUT: LRP Vit C”
Mentioned
“plus salicylic in ur cleanser, ur vit c AND ur effaclar”
Mentioned
“Vitamin C Serum-- just switched to La Roche Posay Vitamin C12 Serum.”
Cautionary
“I switched from the Timeless to the La Roche Posay because I thought reducing the strength might help, but it hasn't really.”
Cautionary
“it seems like whenever I use actives-- which for me means only a retinol and a vitamin c complex---my skin gets pissed off”
Cautionary
