If there's one thing these rockstar antioxidant vitamins have in common, it's the ability to support youthful, flawless skin! Vitamin E is perhaps most seen in topical form as a moisturizing agent. Vitamin A, also known as retinol, works as a moisturizing agent for the skin. Vitamin D, considered A's complementary vitamin, is known as the "Sunshine Vitamin," providing this important nutrient to your skin.