Vitamin B12 is a nutrient that helps keep the body's nerve and blood cells healthy and helps make DNA, the genetic material in all cells. Vitamin B12 also helps prevent a type of anemia called megaloblastic anemia that makes people tired and weak. Those at greatest risk of vitamin B12 deficiency are vegans and vegetarians, who get little to no B12 from their diet. Deficiency can also be caused by poor absorption.
Vitamin B12 injections are the most common way to prevent or treat a deficiency. The injections are given intramuscularly, or into muscle. Bottom Line: If you are deficient in vitamin B12, then the injections are very effective at raising your blood levels.
Vitamin B12 helps your body use fat and carbohydrates for energy and make new protein. It is also important for normal blood, cells, and nerves.
The B12 injections can also help with energy levels, brain function and weight loss.
Vitamin B12 injections are generally considered to be very safe. They have no major side effects. However, in very rare cases, some people can experience side effects caused by allergic reactions or sensitivity.
If you experience any side effects, speak with your doctor.