47 citations,
July 1967 in “Science” Not eating enough protein can cause hair roots to shrink and lose color, and hair to become thinner.
42 citations,
April 2008 in “Acta materialia” Different ethnicities and treatments affect human hair strength and structure.
25 citations,
February 2007 in “Forensic science international” Different hair cleaning methods caused varying levels of damage to the hair's outer layer.
3 citations,
December 2013 in “Journal of Dermatology” Scanning electron microscopy revealed four distinct hair root shapes in alopecia areata, suggesting a less invasive diagnostic method.
April 2023 in “Han'gug miyong haghoeji/Journal of the Korean society of cosmetology” Direct heat perms cause more damage to hair than softening heat perms.