why do people need vitamin b12 injections plays an important role in energy metabolism, nervous system function, and red blood cell production. For some individuals, Vitamin B12 may be used as part of overall wellness B12 Injections vs Pills: Richmond's

"Vitamin B 12 deficiency"

[DOI] [PMC free article] [PubMed] [Google Scholar] 73.Kokoeva MV, Yin H, Flier JS

These can include hives and redness at the injection site

One study noted that B12 supplements, along with folic acid, improved symptoms of neuropathy in patients treated with certain chemotherapy agents

Hypokalemia and sudden death may occur in severe megaloblastic anemia that is treated intensely with vitamin B12

Look for methylated B12 (methylcobalamin), hydroxocobalamin, adenosylcobalamin or a supplement with a combination of these forms.* *A note on cyanocobalamin: Cyanocobalamin is the most commonly used form of B12 in supplements, however it is of questionable safety