Topical Vitamin C
Morning antioxidant. Supports collagen, pairs with sunscreen.
What it does
Topical L-ascorbic acid (10 to 20 percent) adds daytime antioxidant protection against UV and pollution and supports collagen. A complement to sunscreen, not a replacement — and formulation matters more than most topicals.
Vitamin C is a cofactor for collagen synthesis and a potent antioxidant; topical application achieves higher local skin concentrations than oral intake can.
What the evidence shows
Overall evidence strength: Moderate certainty
Who it's for, who should skip
Daytime skin antioxidant support, paired with sunscreen. L-ascorbic acid degrades with light and oxygen — look for opaque packaging and recent dates, and avoid extreme cheapness.
Running it
- Form
- topical
- Dose
- daily, morning · morning
- Titration
- 10–20% L-ascorbic acid in opaque packaging
Stacking & alternatives
Pair it with
- daily sunscreen — Vitamin C complements but does not replace sunscreen — it is an antioxidant layer, not UV blocking.
Access & cost
Available over the counter. Look for: 10–20% L-ascorbic acid serum, opaque packaging.
Last reviewed 27 August 2026.