However, there is little to no evidence to support these claims
[25] Supplementation with vitamin B 12 during conditions of deficiency restores the intracellular level of cobalamin and maintains a sufficient level of the two active coenzymes: methylcobalamin and adenosylcobalamin
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However, some people may experience some pain, swelling or redness at the injection site, and in much rarer cases headaches, itching or nausea
Moreover, increased homocysteine levels due to vitamin B12 deficiency could induce neurotoxicity caused by oxidative stress
Most B12 injections are 1000 mcg/mL, but there are other options too