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Further, even though B12 shots are a good way to remedy B12 deficiency in susceptible people, studies show that B12 supplements do just as good of a job
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Vitamin B12 deficiency and use of proton pump inhibitors: a systematic review and meta-analysis
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Persistent side effects beyond 2 weeks after a dose increase Transient nausea, mild constipation, and decreased appetite are expected and normal during the 1 to 2 weeks after each dose increase
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