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That works, but leaves no room for error
Lets say there are 12 inches of fat between the skin and the muscle below
[1] [2] Factors That Affect How Fast B12 Injections Work Multiple variables influence how quickly you will respond to B12 injection therapy, making it difficult to predict an exact timeline for any individual patient
If the person appears nervous or tense, advise them to put their weight on the leg or arm that you aren't injecting to help relax the muscles
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