vitamin b12 injections subcutaneous or intramuscular (Cyanocobalamin Injections) — Mountainside Medical Vitamin B12 Intramuscular Injection Deltoid

Pro tip: Ask your doctor or nurse what needle length and size will work best for your body and where you want to insert it

B12 increases your energy levels and fights fatigue

hi I find it very easy to reach either arm but admit people do ask me that,I cant see why it would be a problem I just sit on end of bed with stuff all laid out on a clean towel and sharps bin handy,draw up b12 with a red filter needle,personal preference here,then discard and do the injecting with the orange needle , if the b12 is cold or you do have a bead of it on injecting needle then yes your right it can sting but again that is a rarity for me

I have to admit I was skeptical, but this really does work