Vitamin E is a natural, non-toxic ingredient that can be used daily, AM and/or PM. Because it is so gentle, it’s okay to layer it with other vitamin E skincare. It also plays well with all other skin ingredients, but especially vitamin C. These two antioxidants up their protective abilities when used together. That’s because they defend against separate types of UV rays. When mixed together, skin is better protected against the sun (as long as you’re using daily sunscreen, of course). Find sources of both in our Vacation Eyes Brightening Eye Gel.