1,3,7-Trimethylxanthine, jo commonly caffeine kehte hain, ek methylxanthine alkaloid hai jo skin pe lagane ke liye use hota hai. Iska antioxidant aur anti-inflammatory properties hote hain. Caffeine se blood vessels tight ho jaate hain jo puffiness aur dark circles ko kam karne me help karta hai. Isse under-eye area ke liye acha maana jaata hai.