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 Cottage Natural Grocers Vitamin Cottage Natural Grocers Vitamin Cottage Natural Food Markets, Inc () (commonly referred to as "Vitamin Cottage" or "Natural Grocers") is a Colorado based health food chain. The business was founded in 1955 as a door-to-door sales operation by Margaret and Philip Isely. They opened the first Vitamin Cottage store in Lakewood, Colorado in 1963. After Margaret Isely's death in 1997, the Iselys' children took over the business the following year. Beginning in 2008, Vitamin Cottage Natural Grocers phased in a name change to Natural Grocers by Vitamin Cottage, to emphasize that groceries, rather than nutritional supplements, formed a majority