February 2019 in “PubMed” The research found that twisting hair fibers can show changes in stiffness and damage, and help tell apart different hair treatments.
December 2020 in “한국인그리에학회지” Astringent persimmon fruit extract may help increase hair length and coverage without increasing the number of hair follicles.
Tianqi trichogen boosts hair growth in animals without causing allergies.
March 2018 in “Journal of Experimental Biology” Hair curliness is caused by the arrangement and length of two different cell types.
3 citations
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June 1979 in “The Journal of Dermatology” Glycosaminoglycan levels peak early in hair growth and decrease as the cycle progresses.
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September 2017 in “Genes” Selecting specific KRTAP26-1 gene variants can improve wool quality in sheep.
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December 2013 in “Phytotherapy Research” Safflower (Carthamus tinctorius) extract helps hair grow and could be used in hair products.
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August 2022 in “Biochemical Genetics” 
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February 2008 in “Experimental Dermatology” Cyclosporin A promotes hair growth in mice and increases a protein linked to hair growth, but it may not work the same way in humans.
1 citations
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March 2022 in “The Scientific World Journal” The cream made from cocoa pod peel can promote hair growth but may cause skin irritation.
6 citations
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October 2018 in “Endocrinology” Prenatally androgenized ewes can model increased hair diameter in women with PCOS.
10 citations
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May 2016 in “bioRxiv (Cold Spring Harbor Laboratory)” Lipid metabolism affects wool thickness in sheep.
January 1998 in “Proceedings of the British Society of Animal Science” Biotin supports cell growth and DNA synthesis in Angora goat hair follicles.
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December 2019 in “Textile Research Journal” L-cysteine and ultrasound successfully improved rabbit hair fibers for industrial use.
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January 2005 in “Indian Journal of Animal Research” Goat neck skin has a complex network of collagen, elastic, and reticular fibers.
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September 2010 in “Clothing and Textiles Research Journal” Poplar seed hair fibers could be an eco-friendly insulation for textiles.
January 1998 in “Proceedings of the British Society of Animal Science” Biotin supports cell growth and DNA synthesis in Angora goat hair follicles.
Wheat bran promotes hair growth by helping hair cells multiply.
January 2009 in “Adelaide Research & Scholarship (AR&S) (University of Adelaide)” Identifying and manipulating key genes can improve wool quality and productivity in sheep.
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January 2020 in “Czech Journal of Animal Science” The FAT1 gene and its variations can help improve wool quality in Chinese Merino sheep through selective breeding.
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September 2016 in “World Rabbit Science” High wool density in Rex rabbits is linked to specific gene activity affecting hair follicle development.
September 2017 in “Korean journal of acupuncture” Crataegi Fructus water extract may help treat hair loss.
521 citations
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January 1954 in “Physiological Reviews” Hair growth is cyclic and influenced mainly by local factors.
September 2004 in “PubMed” Hair grows in three stages: growing, transition, and resting.
August 2025 in “Animal Bioscience” m6A methylation affects the thickness of Alpine Merino wool fibers.
Stretching-setting treatment works for wool and human hair using specific equipment and methods.
42 citations
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January 2017 in “Genes” The gene KAP22-1 affects wool yield and fiber shape in sheep.