Vitamin C. Molecular model of ascorbic acid (C6.H8.O6), also known as vitamin C. The molecule is shown as the molecule's electrostatic potential map.Vitamin C is a water soluble vitamin which plays an essential role in the activity of many enzymes in the human body. It is necessary for the growth and maintenance of healthy bones, gums, teeth, ligaments, and blood vessels. It is also thought to stimulate the immune system against infection. Dietary sources of vitamin C are citrus fruits and green vegetables. Deficiency of vitamin C leads to scurvy, with swollen bleeding gums and anaemia.