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The duration of the effects of B12 injections varies depending on individual factors such as metabolism and the frequency of injections
How long B12 shots take to work depends on your B12 levels when you receive the injection, but you can expect to see improved energy, mental clarity, sleep, and other benefits anywhere from 12-48 hours after treatment
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References to metabolic activity are limited to nonclinical research context only
We suggest starting with a 1,000 mcg dose given weekly
