vitamin B complex

A group of vitamins including thiamin (vitamin B₁), riboflavin (vitamin B₂), niacin, pyrodoxine (vitamin B₆), pantothenic acid, folic acid, cobalamin (vitamin B₁₂), and biotin. These vitamins play an essential role in the release of energy from food, making them of great interest to exercisers. Prolonged aerobic exercise depends on a sustained production of energy, so deficiencies impair endurance performance. However, there is no evidence for beneficial effects of supplements over and above the amounts required to prevent deficiency.