Caffeine

Caffeine is the chief stimulant in beverages such as coffee and tea. It’s often included in skin care products with claims that it will improve the look of cellulite or puffy eyes. Applied to skin, caffeine may have soothing and antioxidant properties, especially when skin is exposed to UV light. It can penetrate skin and has a constricting effect, which can help improve the look of redness but also may be sensitizing.