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Serum B12 reference ranges vary between laboratories, but generally, levels below 148 pmol/L are considered deficient, whilst levels between 148258 pmol/L are regarded as borderline and may warrant further investigation or a trial of treatment, particularly if symptoms are present

doi: 10.1016/j.amepre.2015.02.009

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The NHS reports that severe calorie restriction, such as with anorexia, bulimia, or similar eating disorders, sends a message to your brain to stop producing the hormones needed for ovulation (and if you dont ovulate, you wont have a true period, though you may still experience some vaginal bleeding)