Vitamin C, also known as ascorbic acid, is one of the most essential elements of any diet. It is often referred to as a ‘free-radical scavenger’ for its ability to protect cells against oxidative damage. A regular dietary intake of vitamin C strengthens the immune system and may help to defend against colds and flu. Vitamin C also maintains healthy collagen levels in the skin, gums and joint cartilage. Collagen is one of the most abundant proteins in the human body, and helps to provide structural integrity all throughout your body.