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Ingredients

Vitamin C

Antioxidant protection by day, with a genuine role in collagen synthesis.

Published August 14, 20265 min read

Vitamin C in skincare is used for antioxidant defence against daily environmental damage, for brightening uneven tone, and because it's a required cofactor in the body's collagen synthesis.

It's also one of the more temperamental ingredients — formulation and storage matter more here than in most categories.

What it does

  • Neutralises free radicals generated by UV and pollution
  • Supports collagen synthesis as an enzymatic cofactor
  • Fades post-inflammatory marks and evens tone over months
  • Complements sunscreen; it doesn't replace it

Forms

L-ascorbic acid

The most studied form, typically at 10–20% and low pH. Also the least stable and the most likely to irritate. Buy small bottles and replace them.

Derivatives

Ascorbyl glucoside, magnesium ascorbyl phosphate, tetrahexyldecyl ascorbate and similar are more stable and gentler, with less direct evidence but a better tolerance profile.

How to use it

  • Morning, on clean skin, before moisturiser and sunscreen
  • Start every other day if your skin is reactive
  • Store away from light and heat
  • Discard if it turns deep orange or brown — it has oxidised

Where it fits after weight loss

Its role in collagen synthesis makes it a sensible part of a long-term skin-quality routine. That's a support role, not a treatment for laxity, and worth keeping in proportion.

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This guide is general skincare education, not medical advice. For anything concerning your health, medication or a specific skin condition, speak with a qualified clinician.