Solgar Methylcobalamine Vitamin B12 contributes to normal energy-yielding metabolism, to the reduction of tiredness and fatigue, to the normal functioning of the nervous system, to normal psychological function, to the normal formation of red blood cells and to the normal functioning of the system immune. Suitable for vegans. Methylcobalamin is the co-enzymatic form of vitamin B-12 that has been considered especially critical in maintaining a healthy nervous system.