where should b12 injections be given B-12 Vitamin How to Give a B12

Use a drug take-back program if available in your area, or follow FDA guidelines for safe disposal of injectable medications

And heres the thing: You probably dont need any more niacin

doi: 10.1186/s12933-014-0129-4

Luke's Hospital lists the following drugs as those that might possibly interact with B12 injections

If you produce meat or milk from your goats, you will need to make sure any pesticides detected in those products don't exceed legally required limits

when drugs display this biphasic elimination pattern, the half-life corresponding to the second phase is what is clinically relevant, and this half-life is known as the terminal half-life