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How Quickly They Work The effects of a vitamin B12 injection are usually felt within days to weeks
Community research plans often use an 8- to 16-week window, but those schedules were not tested in controlled human trials
The Initial Boost: What to Expect After Your First Shot If youve been diagnosed with a significant B12 deficiency, your GP will likely prescribe an initial course of injections, often called a loading dose phase
Vitamin B12 improves your metabolism, which in turn helps with weight control
These citations are context, not medical advice, proof of eligibility, or a claim that every study applies to every patient
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