Vitamin B12 Tablets 250mcg. Healthy levels of vitamin B12 are required for normal cell division and the production of red blood cells. What is Vitamin B12?. Vitamin B12 1000µg 40,000. Ingredients Bulking Agents (Microcrystalline Cellulose, Dicalcium Phosphate), Vitamin B12 (Cyanocobalamin), Anti-Caking Agent (Magnesium Stearate).