Vitamin amino acids. Most vitamins are not single molecules, but groups of related molecules called vitamers. For example, vitamin E consists of four tocopherols and four tocotrienols. The thirteen vitamins required by human metabolism are: vitamin A (retinols and carotenoids), vitamin B (thiamine), vitamin B (riboflavin), vitamin B (niacin), vitamin B (pantothenic acid), vitamin B (pyridoxine), vitamin B (biotin), vitamin B (folic acid or folate), vitamin B (cobalamins), vitamin C (ascorbic acid), vitamin D (calciferols), vitamin E (tocopherols and tocotrienols), and vitamin K (quinones). Vitamins have diverse biochemical functions. Some forms of vitamin A function as regulators of cell and tissue
Vitamin C (singer) Vitamin C (singer) Colleen Ann Fitzpatrick (born July 20, 1972), better known by her stage name Vitamin C, is an American pop music singer, songwriter, record producer, dancer, and actress. She began her career as an Ivory soap baby and child actress, appearing in John Waters' film "Hairspray" (1988), and continued to appear in minor roles in films before starting the alternative rock band Eve's Plum in 1991. In 1999, Fitzpatrick embarked on a solo career under the name Vitamin C, releasing her eponymous debut album "Vitamin C" (1999), which was certified as Gold and later Platinum by the RIAA.