Common symptoms include: Chronic fatigue Dizziness or light-headedness Pale or yellowing skin Shortness of breath Mood swings, anxiety, or depression Tingling in hands and feet Brain fog or memory difficulties When these symptoms occur alongside hair loss, a B12 test is highly recommended
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10.1096/fj.201700908R [DOI] [PMC free article] [PubMed] [Google Scholar] 36.Qi L, Chen X, Wang J, Lv B, Zhang J, Ni B, Xue Z