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 Records Records has also released an album honoring songs from the popular video game series Guitar Hero. Vitamin Records Vitamin Records is a Los Angeles based record label founded in 1999 as a subsidiary of CMH Records. The label was formerly home to the Vitamin String Quartet, who are best known for performing string quartet tributes to popular rock and metal acts such as Tool, Nine Inch Nails, and Radiohead. Vitamin Records has also produced tribute albums in several other styles including lounge, electronica, industrial, and dub music. The label's first release was "The String Quartet Tribute to Led Zeppelin" in