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antioxidant · active

Vitamin C

Watch if sensitive·Strong evidence·INCI: Ascorbic Acid

The most well-studied form of topical vitamin C, used as an antioxidant and to support collagen signaling and brighten uneven tone. It is acidic and can sting or irritate sensitive skin, and it oxidizes readily once a bottle is opened, which can reduce its effectiveness rather than create a safety issue.

Worth knowing

  • Can irritate, especially left on

References

This dossier covers safety and concern. For what the efficacy evidence says about Vitamin C, see SerumTruth ↗, our sister site.

Cosmetic information for general education, not medical advice. Concern is graded on cited evidence, never on hazard-score lists. See how we score.