B vitamins support normal energy yielding metabolism vitamins b1 b2 b3 pantothenic acid b6 and b12 and the reduction of tiredness and fatigue vitamins b2 b3 pantothenic acid b6 b12 high strength mega b 100 is an excellent source of b vitamins including thiamin b1 riboflavin b2 niacin b3 vitamin b6 and vitamin b12 which also contribute to the normal functioning of the nervous system b vitamins support normal energy yielding metabolism vitamins b1 b2 b3 pantothenic acid