Vitamin B12 Deficiency: Symptoms, Causes & Treatment B12 Injections for Energy: Benefits and How It Works AZ IV Medics B12 Folate normal ranges in blood work can be between 220 and 1200. I personally think anything under 600 is too low. B12 injections are the best (by pass digestion) and you can B12 level 99 ng L. Is this really low or just a little low? How often for injections? : r B12_Deficiency
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