March 1963 in “Sangyo Igaku” Women generally have higher levels of iron, copper, and zinc in their hair than men, with differences increasing with age.
January 2006 in “Heilongjiang yiyao kexue” Children with frequent respiratory infections may have low levels of zinc, iron, and copper.
March 2024 in “Indian Journal of Dermatology” Iron supplements may improve hair loss satisfaction even if initial iron levels are normal.
January 2011 in “Nuclear Techniques” Lead levels in hair increased due to environmental exposure, while iron, copper, and zinc levels stayed stable.
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January 2016 in “Hair therapy & transplantation” People with early graying hair often have lower levels of iron, ferritin, and calcium.