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August 2014 in “Jo'jig gonghag gwa jaesaeng uihag/Tissue engineering and regenerative medicine” Human hair keratin can be used in many medical applications.
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July 2009 in “The journal of investigative dermatology/Journal of investigative dermatology” Human beard hair medulla contains a unique and complex mix of keratins not found in other human tissues.
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December 2019 in “Nutrients” An apple-based supplement was found to stimulate hair protein production, which may help with hair growth.
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February 2021 in “FEBS open bio” Human hair keratins K85 and K35 create unique filament patterns important for early hair formation.
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July 1999 in “Journal of biological chemistry/The Journal of biological chemistry” Human hair is made up of different keratins, some strong and some weak, with specific types appearing at various stages of hair growth.