Quest multi b complex is a gentle potency quick acting formula providing a full spectrum of the b vitamins plus vitamin c to support energy levels the nervous system and psychological function vitamins b1 b2 niacin b3 b6 pantothenic acid and vitamin c contribute to the reduction of tiredness and fatigue vitamins b1 niacin b3 b6 b12 biotin and vitamin c contribute to normal functioning of the nervous system and normal psychological function