Swanson Vitamin B-12 will promote the natural production of energy in your body and improve the health of your cardiovascular system. This vitamin is of key importance for the formation of red blood cells which supply all body parts with oxygen. This in turn increases the energy levels in the body. Vitamin В-12 plays a significant role in maintaining the cardiovascular system in good health. It furthermore contributes to neutralising the harmful homocysteine in combination with vitamin B-6 and folic acid. Everyone needs sufficient levels of vitamin В-12, but its intake as a supplement is vital for vegetarians since products of animal origin are the main natural source of this important nutrient.