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Feeling Tired All the Time? It Might Be a Vitamin B12 Deficiency Fusion HealthCare Vitamin B12 Blood Test: Uses, Normal Range, and Results How Quickly Does a B12 Shot Work? Benefits & What to Expect Vitamin B12 Deficiency Harvard Health How long after initiating vitamin B12 (cobalamin) injections should lab work be rechecked for a patient with an initial vitamin B12 level of 173, which is below the normal range?
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