<unk> , also known as<unk> and vitamin<unk> , is a vitamin, an essential micronutrient, which cannot be made in the body. It is found in food and commercially synthesized to be a dietary supplement or medication. Food sources of<unk>  include whole grains, legumes, and some meats and fish. Grain processing removes much of the<unk>  content, so in many countries cereals and flours are enriched with<unk> . Supplements and medications are available to treat and prevent<unk>  deficiency and disorders that result from it, including beriberi and Wernicke encephalopathy. Other uses include the treatment of maple syrup urine disease and Leigh syndrome. They are typically taken by mouth, but may also be given by intravenous or intramuscular injection.<unk>  supplements are generally well tolerated. Allergic reactions, including anaphylaxis, may occur when repeated doses are given by injection.<unk>  is required for metabolism including that of glucose, amino acids, and lipids.<unk>  is on the World Health Organization's List of Essential Medicines.<unk>  is available as a generic medication, and as an over-the-counter drug.
Thiamine
Folate
Pantothenic acid
Niacin
Calamine
Pyridoxine
Cholic acid
Tocopherol