Natural Factors Vitamin B12 - 250 mcg - Required to prevent anemia, Vitamin B12 (Cyanocobalamin) also aids Folic Acid in regulating the formulation of red blood cells and helps in the utilization of iron. Required for proper digestion, absorption of foods, synthesis of protein, and metabolism of carbohydrates and fats, maintenance of Vitamin B12 levels is crucial for vibrant health and well-being. Strict vegetarians and seniors require B12 supplementation, as it is found almost exclusively in animal tissues. Natural Factors Vitamin B12 is an excellent source of this important nutrient, designed to insure the maintenance of adequate levels of B12.