Vitamin C benefits for skin: what it does and who it suits

What vitamin C actually does

Category: antioxidant (L-ascorbic acid and derivatives). In a cosmetic routine the job of vitamin C is to help neutralise free radicals from sun and pollution and brighten the look of uneven tone, which fits its stated use: brightness and antioxidant defense.

Typical strength: 10–15% L-ascorbic acid or 2–10% gentler derivatives. Best used morning, under sunscreen.

What you can realistically expect

Timeline: eight to twelve weeks for tone and brightness. Typical sensation: slight tingle on pure ascorbic forms, none with derivatives.

A popular belief is that darker orange serum is stronger; in reality oxidised vitamin C (orange or brown) is losing potency and may irritate; replace it.

Who it suits, and who should wait

Best for dull, sun-exposed or uneven tone; derivative forms for sensitive skin. Store away from heat and light.

Take extra care with strong acids layered right before it.

How to spot a good product

Look for opaque, airless bottle with ascorbic acid, ascorbyl glucoside or magnesium ascorbyl phosphate. Skip formulas where vitamin C appears after fragrance and preservatives.

Practical tip: store in a cool, dark place and write the open date on the bottle.

Who should tweak what

Skin type changes how quickly you can build up, so use these starting points as a guide.

Choosing a vitamin C product

Spend thirty seconds with the back of the pack before spending money on the front.

Frequently asked questions