Dietary Supplement. 1,000 MCG B-12 Methylcobalamin! With "Quick Energy" MCT s*. Why Supplement with B Vitamins? B vitamins are essential to life.* These nutrients play a critical role in numerous biochemical reactions throughout the body.* The are especially important for metabolism, energy production, and the maintenance of a healthy nervous system.* B vitamins are water-soluble nutrients that are poorly stored in the body and readily eliminated after a short period of time.* Therefore, in order to maintain optimum levels, B vitamins must be replenished daily.* Mega B-Complex is a balanced blend of high-potency B vitamins that can help you meet or exceed your daily requirements.* This formula provides all of the.