what happens if you inject b12 in the wrong place Injections at Home - Safety Guide for Self-Administration What You Need to Know

How to inject vitamin B12 in your arm Instructions to inject vitamin B12 into your arm B-12 injections are often given in the arm and especially, in medical terms, the deltoid part of the shoulder

I also spoke to my local Sainsburys pharmacy who told me the same thing

B12 injections are typically administered intramuscularly (IM) into the deltoid muscle of the arm or the gluteal muscle of the buttock

The following screen shots are of NICE Guidelines Do not do recommendations for CFS/ME It is a really tricky page to find (and has a habit of hiding) so here is the link

Amos K, Yeoh S, Farah CS

Because of this, taking more than the recommended dosage of Vitamin B-12 will neither help nor harm you unless you have an actual problem with deficiency