Since 1947 Antioxidant Support Immune Support Non-GMO Gluten, Wheat & Dairy Free Suitable for Vegans K-Parve Dietary Supplement Vitamin C is water-soluble vitamin that helps fight free radicals, which can lead to oxidative stress and the premature aging of cells. One of its primary functions is collagen formation, which is important for healthy skin and joints. Vitamin C also plays and essential role in the functioning of white blood cells, which are vital components of the immune system. It helps to promote cardiovascular health.