Caffeine is a methylxanthine used in topical skincare for its antioxidant properties and ability to temporarily constrict blood vessels, which may reduce the appearance of under-eye puffiness, dark circles, and skin redness. It is also studied for potential anti-cellulite and protective effects against UV-induced damage.
| Reported effect | How often | Notes |
|---|---|---|
| Mild transient skin irritation or stinging | Uncommon | Usually associated with higher concentrations or sensitive skin. |
| Redness (erythema) | Rare | Typically resolves shortly after application. |
| Allergic contact dermatitis | Very rare | Sensitization to topical caffeine is uncommon but documented in case reports. |
| Dryness | Rare | More likely when combined with other actives or in leave-on formulations. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.