Hydroxycinnamic acid is a phenolic compound (the parent of derivatives like ferulic, caffeic, and p-coumaric acids) used in skincare for its antioxidant and free-radical scavenging properties. It is often incorporated to help protect against oxidative and UV-induced skin damage.
| Reported effect | How often | Notes |
|---|---|---|
Mild transient irritation or stinging | Uncommon | Most often seen at higher concentrations or in sensitive skin. |
Contact dermatitis or allergic sensitization | Rare | Reported occasionally with phenolic acids; presents as redness or itching. |
Photosensitivity-related reactions | Very rare | Limited reports; generally considered photoprotective rather than photosensitizing. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.