Vitamin B12 is an essential co-factor for your body to function properly on a day to day basis. Vitamin B12 injection therapy helps to boost metabolism, aid in weight loss, improve energy and create mental clarity. Many people choose to take Vitamin B12 in a supplement form, however this form has to go through the digestive system where the vitamin may or may not be absorbed. Choosing injection therapy insures that Vitamin B12 will go directly into the blood stream and start being utilized immediately. Meat and eggs are rich in Vitamin B12, therefore vegans and vegetarians should supplement their diets with B12.