Which B vitamins are usually considered part of a B Complex?

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A Vitamin B-Complex usually contains thiamine (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), pantothenic acid (vitamin B5), pyridoxine (vitamin B6), biotin, folic acid, and cobalamin (vitamin B12). B vitamins support a variety of physiological functions, from energy metabolism to DNA synthesis to neurological health.