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Individual results depend heavily on baseline body composition, diet quality, exercise adherence, sleep, and other lifestyle factors
Some physicians limit B12 shots only to those with documented deficiencies or absorption issues to prevent unnecessary treatment where dietary B12 is sufficient
The evidence is unclear or shows little to no benefit from using B12 supplementation, but more research is needed in these areas
Most people will excrete any excess vitamin B12 through their urine without experiencing any adverse effects
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