Caffeine is a methylxanthine used in topical skincare for its antioxidant properties and ability to temporarily constrict blood vessels, which can reduce puffiness and the appearance of redness, contributing to a toned look. It is also studied for reducing under-eye puffiness and supporting the skin's defense against UV-induced oxidative stress.
| Reported effect | How often | Notes |
|---|---|---|
Mild skin irritation or stinging | Uncommon | More likely at higher concentrations or on sensitive skin. |
Contact dermatitis / allergic reaction | Rare | Caffeine sensitization is reported but infrequent. |
Transient redness or dryness | Uncommon | Usually mild and resolves on discontinuation. |
Eye irritation | Rare | Possible if eye-area products migrate into the eyes. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.