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B vitamins are a class of water-soluble vitamins that play important roles in cell metabolism.
Some individual B vitamins are better known by name than number, for example, B1 is thiamine, B2 is riboflavin, B3 is niacin B5 is pantothenic acid, and B7 is biotin.
B vitamins are often supplemented to help support normal energy levels and the reduction of tiredness and fatigue.