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Genetics, hormones (particularly DHT), stress, sleep, iron, thyroid function, and other micronutrients all influence hair quality and retention
PMID 19255021
25 Patients diagnosed with vitamin B 12 deficiency whose history and physical examination do not suggest an obvious dietary or malabsorptive etiology should be tested for pernicious anemia with anti-intrinsic factor antibodies (positive predictive value = 95%), particularly if other autoimmune disorders are present
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