The Lab
Specimen No. 0051
ClearedDerivedantioxidant

Vitamin C (Ascorbic Acid)

ascorbic acid · l-ascorbic acid · sodium ascorbyl phosphate

Potent antioxidant that brightens skin, stimulates collagen synthesis, and neutralizes free radical damage. Well-established and one of the most researched skincare ingredients.

high confidence
Researched April 18, 2026

Concerns

  • Oxidizes quickly — formulas must be in opaque packaging
  • Can sting on application, especially above 15%
  • Not all derivatives are equally effective — L-ascorbic acid is most potent but least stable

Sourcing & processing

naturally sourcedplant derived

Commonly found in

Vitamin C serumBrightening moisturizerEye creamSPF formulas

Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.

Check another ingredient

Search our database of scored cosmetic, food, and household ingredients — or scan a full product label.

Open the Ingredient Lab

Embed this verdict

LabelCleared verdict badge: Vitamin C (Ascorbic Acid) — Cleared
<a href="https://labelcleared.com/lab/vitamin-c-ascorbic"><img src="https://labelcleared.com/embed/vitamin-c-ascorbic/badge.svg" alt="LabelCleared verdict badge: Vitamin C (Ascorbic Acid) — Cleared" height="34"></a>