Vitamin CBenefits, how to use & safety
Antioxidant protection. Not a gentle suggestion.
What is Vitamin C?
Vitamin C in its pure form, L-ascorbic acid, is the gold standard antioxidant for skin. It neutralises free radicals from UV and pollution, supports collagen production and brightens dull, uneven skin. It is also notoriously unstable, so formulation quality matters as much as the percentage.
How it works
Skin cells need vitamin C as a cofactor to build collagen, and applied topically it also interrupts the enzyme tyrosinase, which slows melanin formation. As an antioxidant it absorbs oxidative damage that would otherwise break down collagen and darken pigment, and it adds measurable protection when used under sunscreen.
Key benefits
- Brightens dullness and fades sun-related dark spots
- Supports collagen and softens fine lines
- Boosts the daytime protection of sunscreen against oxidative damage
- Helps even tone and improve radiance
- Dullness
- Hyperpigmentation
- Fine lines
Best suited for: Normal, oily, combination and sun-exposed skin. Sensitive skin should start with a gentler derivative such as ascorbyl glucoside.
How to use it
Apply 10–20% L-ascorbic acid in the morning on clean, dry skin, then moisturiser and broad-spectrum sunscreen. Start at 10% every other day and build up. Store in a cool, dark place, keep the cap tight, and discard the product when it turns dark orange or brown.
Pairs well & what to avoid
- Vitamin E and ferulic acid, which stabilise it and boost protection
- Hyaluronic acid to offset dryness
- Sunscreen every single morning
- Benzoyl peroxide in the same routine, which can oxidise it
- Layering strong acids or retinol at the same time on sensitive skin
Safety & side effects
Stinging, tightness and mild redness are common when starting, especially below pH 3.5. Introduce slowly. Oxidised vitamin C is not dangerous, but it works poorly and may irritate. Topical vitamin C is generally considered fine in pregnancy; confirm with your doctor.
Frequently asked
Morning or night for vitamin C?
Morning is the best slot because the antioxidant protection works alongside sunscreen through the day. It can be used at night too, but there is no special advantage.
Why did my vitamin C turn orange?
L-ascorbic acid oxidises when exposed to air, light and heat. Orange or brown means it has degraded and delivers less benefit. Choose airless pumps or dark glass bottles.
Can I use vitamin C with retinol?
Yes, but not in the same step if you are new to either. Use vitamin C in the morning and retinol at night.
Educational content only, not medical advice. Individual skin responds differently. Patch-test new actives, introduce one at a time, and consult a dermatologist for persistent skin concerns, pregnancy or breastfeeding questions, or any prescription treatment.
