how often are b12 injections given Should You Get Injections? The Timing of B12 Injections:

This keeps B12 levels just right

Gastrointestinal absorption of vitamin B 12depends on the presence of sufficient intrinsic factor and calcium ions

Energy The research is limited and far from a slam dunk but Cowling says higher doses of B 12 supplementation may increase energy, particularly if you have a deficiency or are at risk of a deficiency

IN-VITRO RESEARCH ONLY NOT FOR HUMAN USE Peptides

The inhibitory effects of chronic exposure of vitamin B12 on glutamate-induced neurotoxicity were determined in cell culture, probably by altering the membrane properties through S-adenosylmethionine (SAM)-mediated methylation [26, 27]