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When should B12 (vitamin B12) levels be rechecked after starting monthly injections? Vitamin B12 Deficiency: Causes, Symptoms, and Treatment B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics About to start B12 injections today after getting these results. How likely am I to start feeling an immediate improvement? : r B12_Deficiency For those taking injectable B12, how often is your level tested? : r B12_Deficiency
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