arm hurts after b12 injection for Tendinitis Pain Relief Prevent Arm Pain After a
Description
Adults usually get 1000 mcg of Vitamin B12 injected into a muscle

5-Amino-1MQ is a synthetic small-molecule compound classified as an NNMT (nicotinamide N-methyltransferase) inhibitor
Compounded methylcobalamin injections may be prescribed for those with vitamin B12 deficiency

These are more considerations of medications affecting vitamin status (rather than the vitamin affecting the medication), but they illustrate the clinical judgment required when co-administering this injection with certain treatments