Vitamin C is powerful antioxidant that works to stimulate collagen production in your skin. It also fights fine lines, brightens your complexion, and provides a host of other benefits. Skincare experts also tout it as one of the best anti-aging ingredients you could ever use. Although you get vitamin C from the foods you eat, it probably doesn’t end up in your skin. Using vitamin C serum is the easiest and most direct way to deliver the nutrient to your skin. It’s a effective product in the treatment of acne.