B vitamins are a class of water-soluble vitamins that play important roles in cell metabolism. Though these vitamins share similar names, they are chemically distinct compounds that often coexist in the same foods. In general, dietary supplements containing all eight are referred to as a vitamin B complex. Individual B vitamin supplements are referred to by the specific number or name of each vitamin: B1 that is thiamine, B2 that is riboflavin, B3 that is niacin, etc. Some are better known by name than number: niacin, pantothenic acid, biotin and folate
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