where to give im b12 injections How self-inject intramuscular vitamin - Overview Instruction Guide for Intramuscular (IM)

After opening and / or dilution and / or reconstitution: the product should be used immediately

Critical Reviews in Clinical Laboratory Sciences

It is very difficult to overdose on vitamin B12, and some would not even consider taking too much excess B12 as an overdose, as the body efficiently filters out what it does not need

Side effects and precautions Vitamin B12 injections are generally safe, but some side effects have been reported

Less Common but Serious Side Effects: Sudden severe pelvic pain or bloating

How long it lasts depends on what caused it, the extent of the damage if any that it caused, the treatments and more