Vitamin B12 Deficiency: Recognition and Management AFP 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 Oral vs. Intramuscular Vitamin B12 in Vitamin B12 Deficiency The Blood Project B12 Shots for Weight Loss: What You Need to Know ISSA
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