Caffeine has antioxidant and inflammatory properties. It’s often found in skincare products designed to improve circulation and decrease puffiness, such as eye creams and anti-cellulite formulations. Caffeine is a vasoconstrictor – it makes blood vessels smaller, which can help address redness, too. It’s also a great anti-irritant which can soothe and smooth skin. When combined with certain other ingredients, caffeine boosts brightness and helps keep skin looking fresh.