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B-Complex Vitamins. A group of eleven water-soluble vitamins (q.v.), formerly identified by letters, as B1, B2, G, etc., but now more generally identified by their chemical names, as thiamine (q.v.), riboflavin (q.v.), niacin (q.v.), pyridoxine, biotin (q.v.), pantothenic acid (q.v.), etc. While they are not chemically related, most of them are constituents of coenzymes (q.v.).