B vitamins are a class of water-soluble vitamins that play important roles in cell metabolism and synthesis of red blood cells.[1] They are a chemically diverse class of compounds; some contain sulfur and B12 contains cobalt.[1] Dietary supplements containing all eight are referred to as a vitamin B complex. Individual B vitamins are referred to by B-number or by chemical name, such as B1 for thiamine, B2 for riboflavin, and B3 for niacin,[1] while some are more commonly recognized by name than by number, such as pantothenic acid (B5), biotin (B7), and folate (B9).
Each B vitamin is either a cofactor (generally a coenzyme) for key metabolic processes or is a precursor needed to make one.[1]
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