Ascorbic acid (vitamin C) is a water-soluble antioxidant used in skincare to neutralize free radicals, support collagen synthesis, and brighten skin tone. At 0.01% it is present at a very low concentration, well below the typical 5-20% range needed for significant active effects, so it likely functions as a minor antioxidant or stabilizer.
| Reported effect | How often | Notes |
|---|---|---|
| Mild stinging or tingling | Uncommon | More common at higher concentrations and low pH; minimal at 0.01% |
| Skin irritation or redness | Uncommon | Typically associated with higher concentrations or sensitive skin |
| Dryness | Rare | Occasional with acidic formulations |
| Allergic contact dermatitis | Very rare | Hypersensitivity reactions are infrequently reported |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.