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A blood test is the clearest way to know if this applies to you

Other iron tests like serum iron can vary significantly throughout the day, making ferritin levels the gold standard for diagnosing iron deficiency-related hair loss

Such conditions can prevent your body from absorbing the essential nutrient or inhibit the release of the nutrient

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Contraindications/Precautions: Who should not take this medication? Patients with early hereditary optic nerve atrophy, cyanocobalmin hypersensitivity, and those who are pregnant

(PubMed) Ho C, Kauwell GP, Bailey LB