Viridian HIGH TWELVE Vitamin B12 with B Complex offers a full array of B vitamins along with a higher level of a featured B vitamin. This supplement features higher levels of methylcobalamin and Adenosylcobalamin (vitamin B12). Vitamin B12 contributes to normal homocysteine metabolism and red blood cell formation, to the reduction of tiredness and fatigue, the energy-yielding metabolism, to normal psychological function, and the functioning of the nervous system. Vitamin B12 also contributes to the normal function of the immune system. Folic acid (folate) contributes to a reduction in tiredness and fatigue, the normal function of the immune system, and normal psychological function.