B-12 injectables usinginslulin needles
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If you're going to do it I would suggest you research it thoroughly plus use sterile equipment. Probably for IM I would choose a large muscle. The thigh might be the most accessible.
In all honesty, I don't think you should be doing this (or even thinking about doing it). I think you should be discussing this with your health professional and if the shot is warranted them let them administer it.
I think this is very, very stupid and very, very dangerous.