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Methylmalonic acid and homocysteine levels provide accurate diagnosis when serum B12 falls between 200-400 picograms per milliliter (the gray zone where symptoms appear but standard tests show normal results)

10.1016/j.intimp.2021.108175 52 XuZ.ZhangQ.DingC.WenF.SunF.LiuY.et al (2023)

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"All the food we eat is broken down by the body into amino acids," Dr

B12 isa complex vitamin that is most often found naturally in foods like meat, eggs, dairy, and some fortified foods, so it can sometimes be difficult to achieve high enough levels of B12 if you do not regularly eat these foods