Vitamin C is an essential vitamin that is utilized by the body for many physiological purposes. It is an important compound in the production of collagen and carnitine. It also plays a role in a properly functioning neurological system as well as reducing fatigue and sensations of tiredness. Vitamin C also plays a role in iron absorption. Perhaps the most well known role of Vitamin C is that it supports normal immune function and helps protect immune cells from the toxic byproducts of the immune systems normal functioning.