how long does a b12 injection take to work It for Shots Fast? The Truth About B12 Injections:

My cat Cleo (who I had to put down after a lengthy illness with advanced renal disease) felt much better after I gave her a B12 shot and even though I knew it wasn't curing her it made me feel better to know that I was at least making her feel better

For growth hormone secretagogues like tesamorelin, the research is inconclusive

Nervous System Issues : Vitamin B12 injections can sometimes cause nervous system problems, such as numbness or tingling in the hands and feet, muscle weakness, or difficulty walking

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Oral and mucosal symptoms often provide early clues