Vitamin C is what protects your skin from harmful free radicals, collagen-destroying, barrier-weakening, sagging, and dehydrating.
Vitamin C can completely brighten your complexion because they have an ability to reduce the appearance of hyperpigmentation and discoloration caused by sun damage. Not only reduce the appearance, but also vitamin C can reduce sun damage. In 1992, a study was done by Dr. Sheldon Pinnell proves that the vitamin-C form of L-ascorbic acid reduced sun damage. And because Vitamin C is full of antioxidant, it protects you from skin troubles and retexturizes your skin.
Vitamin C is also a vital component to a healthy diet, but applying onto the skin is 20X more effective than oral ingestion.