The body needs enough B12 to create energy and optimize brain functioning. Vitamin B12 is an important nutrient within the body that assists with adequately forming red blood cells, replicating DNA, lowering homocysteine levels (which reduces the risk of heart disease and stroke), and forms myelin sheath which safeguards the nerves in the body.

Injections are preferred over oral therapy because, without sufficient enzymes and stomach acid, B12 from oral supplements or food may not be absorbed effectively. Vitamin B12 is a water-based vitamin that can be easily eliminated from the body through urine if the body naturally has adequate levels. Therefore, there are very little risks involved with having a vitamin B12 injection.

Signs of low vitamin B12 levels include: