170 citations
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January 2010 in “animal” Hair follicle growth and fiber production in animals are influenced by chemical signals, proteins, pigmentation, genetics, and nutrients.
97 citations
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March 2010 in “The American Journal of Human Genetics” A mutation in the KRT74 gene causes tightly curled hair.
73 citations
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June 2001 in “Endocrinology” Prolactin affects when mice shed and grow hair.
40 citations
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June 2019 in “Biochemical and Biophysical Research Communications” CHIR99021 helps create human skin with hair follicles, offering hope for hair loss treatments.
36 citations
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May 2016 in “Biomaterials” Endo-HSE helps grow hair-like structures from human skin cells in the lab.
19 citations
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February 2008 in “Archives of Dermatological Research” Mast cells might contribute to hair loss by causing skin thickening.
18 citations
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November 2016 in “Transgenic research” Overexpressing Tβ4 in cashmere goats improves hair fiber traits and increases cashmere yield.
14 citations
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June 2001 in “Endocrinology” Prolactin affects when mice shed and grow hair.
14 citations
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December 2021 in “International journal of molecular sciences” Growth hormone levels affect hair growth and loss, with too much causing excess hair and too little leading to hair loss.
9 citations
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February 2016 in “Anatomical Science International” Hair proteins change location and structure as hair cells mature.
6 citations
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May 2020 in “Scientific reports” Researchers identified genes and proteins that may influence wool thickness in sheep.
5 citations
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February 2013 in “Dermatology and therapy” Crescina® lotion helps reduce hair loss and increase hair growth in males with androgenetic alopecia.
May 2026 in “Frontiers in Cell and Developmental Biology” Collagen networks play a key role in hair loss and follicle miniaturization.
January 2019 in “Journal of Entomology and Zoology Studies” Ruminant goats have larger and more defined hair follicles than younger goats.
70 citations
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June 1998 in “Polymer” Permanent waving damages hair by disrupting its keratin structure.
45 citations
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February 2002 in “International Journal of Cosmetic Science” Ceramide helps protect African–American hair from breakage.
35 citations
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May 2011 in “Experimental Dermatology” Aging causes changes in hair follicles, leading to weaker hair growth.
16 citations
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August 2000 in “Il Farmaco” Men have more tryptophan in their hair than women, and it increases with age and is higher in darker and grey or white hair.
10 citations
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January 2012 in “International Journal of Cosmetic Science” Thioglycolic acid mainly affects the unordered areas in hair structure.
3 citations
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August 2018 in “Stem cells international” Hair follicle cells help maintain and support stem cells and blood cell formation.
48 citations
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July 1993 in “Archives of Dermatological Research” Merkel cells are abundant in facial vellus hair follicles, especially during the anagen phase.
35 citations
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February 2003 in “Biochimica et Biophysica Acta (BBA) - General Subjects” Lead can help reveal and organize lipids in human hair.
24 citations
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November 2019 in “Experimental Dermatology” PPAR-γ is important for healthy hair and its problems, and more research on PPAR-γ treatments is needed.
8 citations
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August 2020 in “Domestic Animal Endocrinology” Melatonin improved cashmere production in goats during the first cycle but had no lasting effects on the next cycle.
5 citations
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May 1983 in “Australian journal of biological sciences” Certain amino acid analogues can inhibit wool and hair growth and affect fiber strength.
July 2025 in “The Journal of Physiology” C-tactile afferents are linked to emotional touch and social bonding through hair movement.
86 citations
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May 2002 in “Journal of Investigative Dermatology” A new keratin, hK6irs1, is found in all layers of the hair follicle's inner root sheath.
53 citations
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November 1997 in “Journal of Forensic Sciences” Darker hair in guinea pigs holds more codeine than lighter hair.
48 citations
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May 1991 in “The journal of investigative dermatology/Journal of investigative dermatology” Trichohyalin is also found in the outer layers of normal human skin.
41 citations
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June 2006 in “Journal of Investigative Dermatology” Beard and scalp hair cells have different gene expressions, which may affect beard growth characteristics.