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Using Multicountry Ecological and Observational Studies to Determine Dietary Risk Factors for Alzheimers Disease
B12 shots are often prescribed by medical providers to treat B12 deficiencies and pernicious anemia
The evidence base for use of these drugs, either for off-label indications or as non-approved drugs, is wanting
Exact reference ranges also vary between individual laboratories, but generally a serum vitamin B12 of under 148pmol/L or 200ng/L is thought to indicate a deficiency[2]
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