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Across a 2-4 week period, the vial gets punctured 20+ times

Self-Administration Guidelines for Home Use For patients who need ongoing vitamin B12 injections, self-administration at home can be convenient

Metformin to reduce metabolic complications and inflammation in patients on systemic glucocorticoid therapy: a randomised, double-blind, placebo-controlled, proof-of-concept, phase 2 trial

10.1016/j.ijbiomac.2024.135844 Int J Biol Macromol

It turns out, though, that the injections may not always be necessary

The boost in energy happens because the vitamin B12 is absorbed directly into your bloodstream through the shot