27 citations,
September 1988 in “PubMed” Hair follicle shape determines hair type: curly, straight, or in-between.
12 citations,
July 2016 in “Forensic science international” The research found that postmortem root bands in hair are likely caused by the breakdown of a specific part of the hair's inner structure after death.
9 citations,
January 2014 in “Journal of analytical & bioanalytical techniques” The study did not conclude whether hair can reliably indicate kidney stones, cholelithiasis, hypertension, or diabetes.
8 citations,
November 2019 in “International Journal of Morphology” Henna dye improves hair cuticle and thickness but effects vary by hair type and health.
5 citations,
March 2009 in “Pediatric Dermatology” The study found that pili bifurcati causes hair to intermittently split into two branches, each with its own outer layer.