Skincare
·4 min read
Vitamin C Serums: How to Choose and Use Them
A sourced guide to vitamin C serums: L-ascorbic acid vs derivatives, concentration and pH, stability, how to layer with sunscreen, and what results to expect.
#L-ascorbic acid
All articles tagged "L-ascorbic acid".
3 articles
Skincare
·3 min read
How to Choose the Best Vitamin C Serum
Look for: L-ascorbic acid at 10-20% (the most studied form), pH below 3.5 (ensures penetration), vitamins E and ferulic acid (stabilize and enhance efficac...
Skincare
·4 min read
Vitamin C Serum Oxidized? Color Signs and When to Toss It
If your vitamin C serum has turned dark yellow, orange or brown, it likely oxidized and lost much of its potency. How to tell, if it's harmful, storing it.