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.
3 citations
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April 2014 in “Journal of Dietary Supplements” CARI ONE helps start hair growth and makes hair follicles bigger and more numerous.
18 citations
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September 2018 in “The Journal of Agricultural Science” Genetic variation in the KRTAP15-1 gene affects wool yield in sheep.
January 2025 in “SSRN Electronic Journal” 7 citations
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December 2015 in “PloS one” Cryopreserved mouse whisker follicles can grow hair when transplanted into nude mice.
42 citations
,
February 1996 in “Journal of Investigative Dermatology” Polyamines, especially spermidine, are essential for hair growth.
22 citations
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February 2017 in “Clinical and Experimental Dermatology” Icariin helps mouse hair grow by boosting a growth factor in skin cells.
1 citations
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January 2008 in “Proceedings of the 9th World Rabbit Congress, Verona, Italy, 10-13 June 2008” Furless male rabbits grew slightly faster and heavier than furred ones, but testosterone levels were not the cause.
January 2022 in “Figshare” Melatonin affects when and how goat hair follicle genes turn on and off during growth cycles.
January 1998 in “Proceedings of the British Society of Animal Science” Biotin supports cell growth and DNA synthesis in Angora goat hair follicles.
January 1998 in “Proceedings of the British Society of Animal Science” Biotin supports cell growth and DNA synthesis in Angora goat hair follicles.
5 citations
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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.
4 citations
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April 2018 in “Biotechnology Letters” Human growth factor 20 can boost mouse whisker growth.
December 2025 in “Jurnal Farmasi Tinctura” Cocoa leaf extract is effective and safe for promoting hair growth.
26 citations
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December 1999 in “Journal of Investigative Dermatology” Certain genes are linked to wool follicle structure and function, but not hair cycle regulation.
8 citations
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April 1965 in “Archives of biochemistry and biophysics” Sheep wool follicles can metabolize both glucose and acetate using different pathways important for wool growth.
5 citations
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March 2017 in “Gene” CAP1 decreases the expression of a hair-related protein in young Tan sheep's skin.
August 2025 in “Animal Bioscience” m6A methylation affects the thickness of Alpine Merino wool fibers.
July 2025 in “Biotechnology and Bioprocess Engineering” Camellia japonica seed extract helps hair grow by activating hair follicles and preventing cell aging.
January 2022 in “Figshare” Melatonin affects when and how goat hair follicle genes turn on and off during growth cycles.
January 2022 in “Figshare” Melatonin affects when and how certain genes work during the different stages of goat hair growth.
1 citations
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January 2020 in “Qucosa (Saxon State and University Library Dresden)” Fine hair on bovine leathers is hard to remove, lowering leather quality and value, but can be managed with specific processing methods.
A 5% pomegranate peel water extract optimally enhances hair growth.
12 citations
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September 2010 in “Clothing and Textiles Research Journal” Poplar seed hair fibers could be an eco-friendly insulation for textiles.
12 citations
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January 1934 in “Proceedings of the Royal Society of London Series B Containing Papers of a Biological Character” Stretched hair has a similar structure to natural silk, showing hair's elasticity involves reversible changes within its molecules.
March 2018 in “Journal of Experimental Biology” Hair curliness is caused by the arrangement and length of two different cell types.
October 2023 in “Cell & bioscience” A special gene region controls the re-emergence of a primitive wool type in Merino sheep, improving their wool yield and adaptability.
September 2024 in “Genes” CRABP1 boosts hair cell growth in Hu sheep by affecting key genes.
4 citations
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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.
6 citations
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February 2016 in “American Journal of Dermatopathology” The boy with woolly hair nevus had thinner hair and abnormal hair follicles, which improved with treatment but worsened when treatment stopped.