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recommendation injection site for vitamin b12 What is the best route administering B12: intramuscular or subcutaneous injection? Where to Inject Vitamin B12
Description
Understanding the limitations of this data helps set realistic expectations about long-term use

Injection site rotation Rotate between at least three injection sites: the abdomen (2 or more inches from the navel), the front of the thigh, and the back of the upper arm

2014 Mar;33(1):70-3
Most cases are temporary and resolve within 3 to 6 months once weight stabilizes

It is a small molecule called 5-amino-1-methylquinolinium, with no amino acids and no peptide bonds
