Vitamin C (ascorbic acid) is a water-soluble antioxidant that neutralizes free radicals, supports collagen synthesis, and inhibits melanin production to brighten skin and even tone. It is commonly used in serums at concentrations of 5-20% and works synergistically with vitamin E and ferulic acid.
| Reported effect | How often | Notes |
|---|---|---|
| Mild stinging or tingling | Common | Often transient, more likely at higher concentrations or low pH formulations. |
| Skin dryness or irritation | Common | Can occur particularly in sensitive skin or with frequent use. |
| Erythema (redness) | Uncommon | Usually temporary and resolves after discontinuation. |
| Contact dermatitis | Rare | Allergic or irritant reactions reported in a small number of users. |
| Yellowish skin discoloration from oxidized product | Rare | Caused by degraded ascorbic acid; cosmetic and washes off. |
| Paradoxical hyperpigmentation | Very rare | Isolated reports, mechanism not well established. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.