Caffeine is a commonly used active ingredient in cosmetics, especially in eye contour care. Available scientific data associate it with several documented effects on the appearance of the eye area. It is linked to visibly reducing the appearance of under-eye puffiness and improving the look of dark circles. Its antioxidant properties are documented and associated with protection against oxidative stress, one of the factors contributing to a tired look. It also provides an immediate toning sensation, linked to smoother, more comfortable-looking skin. Caffeine is documented to help visibly reduce signs of fatigue in the eye contour area.