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January 2017 in “PubMed” All five hair fiber products improved appearance but didn't stick to completely bald areas.
September 2024 in “Heliyon” Repeated hair dyeing significantly damages hair.
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February 2015 in “Clinics in Dermatology” The document concludes that changes in eyelashes and eyelid skin can indicate various local and systemic diseases.
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May 2020 in “Molecules/Molecules online/Molecules annual” Yak belly hair has higher porosity and is less stiff than human hair, making it absorb dye better but less suitable as a direct substitute for hair dyeing.
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February 2023 in “International journal of molecular sciences” Body hairs can be used in forensic science and toxicology like scalp hair.