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Key Takeaways TL/DR Ferritin levels below 30-40 ng/mL can trigger hair loss even when iron levels appear normal B12 deficiency affects hair follicle health and can cause premature graying and thinning Vitamin D levels under 30 ng/mL are linked to alopecia and poor hair growth cycle function A complete blood count with additional markers provides the most comprehensive hair loss diagnosis Early detection through blood tests enables targeted treatment before permanent hair damage occurs Understanding Blood Tests for Hair Health Blood tests serve as powerful diagnostic tools that reveal the underlying biochemical factors affecting your hair health

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doi: 10.3390/ijpb13010003 223 UdomkunP.BoonuparaT.SumitsawanS.KhanE.PongpichanS.KajitvichyanukulP