Malic acid is a naturally occurring alpha hydroxy acid (AHA) derived from fruits such as apples, used in skincare to exfoliate the skin surface, improve texture, and promote cell turnover. It is often combined with other AHAs and acts as both an exfoliant and a humectant.
| Reported effect | How often | Notes |
|---|---|---|
| Mild stinging or tingling on application | Common | Transient sensation, especially at higher concentrations or low pH. |
| Skin irritation and redness | Common | More likely with frequent use or sensitive skin. |
| Dryness or peeling | Uncommon | Results from over-exfoliation. |
| Increased photosensitivity | Common | AHAs heighten UV sensitivity; sunscreen use is advised. |
| Allergic contact dermatitis | Rare | Hypersensitivity reactions reported infrequently. |
| Chemical burn | Very rare | Associated with very high concentrations or improper use. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.