In cases of diagnostic uncertainty, additional tests such as holotranscobalamin or methylmalonic acid may be considered
But unless you have a vitamin B12 deficiency, vitamin B12 injections aren't likely to give you an energy boost." Ironically, the National Institutes of Health says that symptoms of B12 deficiency include loss of appetite and weight loss
Most people notice improved energy within a few days to a few weeks, depending on how low their levels are and how their body responds to treatment
Isomaa B, Almgren P, Tuomi T, Forsn B, Lahti K, Nissn M, Taskinen MR, Groop L
Medicine Re-Programmed Investing in your health and taking diligent care of your body is the highest form of self-care and greatest act of self-love