Holistic Way Natural Vitamin B12 600 mcg is composed of Methylcobalamin which may help support the body to metabolize carbohydrates, proteins and fats. This fast acting sublingual tablet dissolves under the tongue for quick absorption into the bloodstream. Vitamin B12 is necessary for the formation of red blood cells and it acts as key nutrient for supporting the structure and function of brain and nerves, heart health and energy production.