vitamin b12 shot injection site Sites: All You Need to Know Vitamin B12 Shots Guide: Benefits

For a healthy person eating meat, dairy or fortified plant foods, the NHS view is that you do not need B12 injections

Nature Medicine (primary report

For example, if a weekly injection on Monday was missed, it could be given on Tuesday and then resume the normal schedule

Site rotation importance Repeatedly injecting in the same location can cause local tissue changes including lipohypertrophy (abnormal fat accumulation) or lipoatrophy (fat loss creating depressions)

A decrease in NAD+ adversely impacts cellular energy metabolism, while a reduction in SAM hinders the activation of genes that are vital for boosting metabolism