21 citations
,
October 2011 in “PloS one” In this study, researchers identified three molecules in hair that varied with age, suggesting potential markers for aging and targets for cosmetic products.
62 citations
,
December 2008 in “Journal of structural biology” This study found that in naturally curved human scalp hairs, distinct arrangements of cell types on either side of the hair fiber contribute to its curvature.
13 citations
,
October 2008 in “PubMed” This study examined hair curvature in Japanese women, finding that 47% have curved hair, and identified structural differences in hair fiber, which resemble those in wool fibers.
76 citations
,
December 2006 in “Journal of Dermatological Science” This study observed that Japanese women experience diffuse central hair loss after age 40, characterized by reduced hair density and thicker hair ratio rather than vellus-like hairs.
65 citations
,
May 2006 in “Journal of Structural Biology” This study concluded that the curliness of human hair, regardless of ethnicity, originates from the inhomogeneous internal nanostructure due to differences in the distribution of two types of cortices.
12 citations
,
February 2006 in “Lipids” This study found that in Japanese, German, and American females, changes in hair lipid patterns with age may reflect alterations in sebum excretion and affect hair texture.
7 citations
,
March 2005 in “International Journal of Cosmetic Science” This study found that menopause alters hair lipids and reduces hair quality, with hormone replacement therapy mitigating some changes.
234 citations
,
February 2001 in “British Journal of Dermatology” FPHL affects hair density and diameter, causing visible hair loss in older women.
