If you ever feel worse after a B12 injection, the cause is most likely not the B12 itself, but some troublesome excipient
It is also sometimes prescribed to help with certain types of anemia caused by poor absorption of vitamin B12. This particular formulation comes in 1 mL vials that contain 1000mcg of cyanocobalamin, which can be used for multiple doses
Skin flushing or warmth (8-10% of reviews) Brief flushing sensation, usually facial, occurring 10-30 minutes post-injection
They are prescription-only medicines (POMs) subject to rigorous regulatory oversight, with clear indications, dosing schedules, and safety monitoring requirements
No tolerance development to the lipolytic effects was noted in these studies, suggesting that unlike beta-2 agonists (which rapidly desensitize their receptors), beta-3 receptor activation may not produce the same downregulation pattern