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Research shows that around 50 percent to 60 percent of ingested vitamin B12 is usually absorbed when enough intrinsic factor is present in relation to B12, but absorption decreases drastically when this ratio changes
While it has not received FDA approval for therapeutic use, it is available for research purposes and is used in metabolic optimization protocols
This side effect is usually temporary
Comprehensive review on prevalence, clinical features, and diagnosis of B12 deficiency
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For additional clinical context, review Cleveland Clinic vitamin B12 injection information
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