Solgar Vitamin C 500 mg Vegetable Capsules contains Vitamin C, an antioxidant vitamin essential to the body's health and is often seasonally used to support the immune system. Vitamin C is also known to support healthy skin and joints. Also known as Ascorbic Acid, Vitamin C is a water-soluble vitamin. Unlike most other animals, humans cannot make their own Vitamin C. With Vitamin C playing a role in more than 300 bodily functions, life itself depends on regular replenishment. Its primary function is to maintain Collagen, a protein necessary for the formation of skin, ligaments, bones and teeth, and for the strength of blood vessel walls. In addition, Vitamin C plays an important part in the absorption of Iron, which is necessary for the formation of red blood cells. It also plays a role in the utilisation of Folic Acid, one of the B-Complex Vitamins.