EVIDENCE GRADES Multiple rat studies (Krivic 2006 PMID 16583442
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For men, a normal hemoglobin level is 13.2 to 16.6 g/dL, and for women, 11.6 to 15 g/dL.[ref] A normal vitamin B12 level is usually defined as 400 pg/mL or higher
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Vitamin B12 is necessary for the proper functioning of many different aspects of our bodies, and it can sometimes be too tricky to ensure that your diet is allowing you to reach sufficient levels of the vitamin regularly