b12 injection what is it for INJECTIONS What are the benefits of

It would be advisable to tell him / her that you have supplemented with B12 (since a high serum B12 level, in the ABSENCE of supplementation, can be indicative of other serious conditions, so your GP will need to know that the high level is probably due to supplements)

Most available information comes from clinical trial protocols that don't translate easily to real-world use

And always avoid any unauthorized megadose vitamin regimens unless your provider approves

This can increase your need for B12 supplementation, and injections may be especially helpful in these cases

This does not completely negate the peptide, but it reduces efficiency