Vitamin C
Vitamin C is the reference morning antioxidant: it helps protect skin from the oxidative stress of light and pollution, adds radiance and, with continued use, helps even out tone. The most studied form is L-ascorbic acid, which needs a low pH and can sting on sensitive skin; derivatives (ascorbyl glucoside, ethyl ascorbic acid, THD ascorbate) are more stable and gentler at the cost of a slower action. Apply on clean skin, before moisturiser and sunscreen, and keep the bottle away from light so it doesn't oxidise.
Reviewed by the Jade aesthetician team
Avenida Diagonal 369, Barcelona · Last reviewed: 8 September 2026 · Meet the team
Every claim is checked against the laboratory's own datasheet; if it isn't in the source, we don't publish it.
How to use it
- In the morning, always under sunscreen.
- If your serum turns dark orange it has oxidised: replace it.
- Sensitive skin: start with a derivative rather than pure L-ascorbic acid.
- Pairs well with ferulic acid and vitamin E.
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