how to administer vitamin b12 injections at Home - Safety Guide for Self-Administration Best Vitamin B12 Injection Site:
Description
It is given by injection into a muscle or vein

Thanks If my memory serves me well I believe you would need about 10mls of air direct into a vein to cause an air embolism so I wouldnt worry about a tiny amount re subcutaneous and IM
[16] Injectable hydroxocobalamin [edit] Injection of hydroxocobalamin is used to rectify the following causes of vitamin B 12 deficiency (list taken from the drug prescription label published by the U.S

If you want the beneficial effects of testosterone, but you do still care about fertility, taking both TRT and HCG may be the right option
