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 Vitamin B12 Injection Dosage Duluth GA Vitamin B12 Deficiency: Causes, Symptoms, and Treatment How Long Does a B12 Shot Last?
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how low does b12 have to be for injections Vitamin B12 (5000 mcg/ml) [100 mL]