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July 2015 in “PubMed” Human hair's strength comes from a honeycomb-like structure and macrofibrils.
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April 2016 in “Toxicological Research” Lavender oil significantly promotes hair growth in mice.
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November 2016 in “International Journal of Cosmetic Science” A tough membrane between the outer and inner layers of human hair protects it from damage.
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April 2018 in “PubMed” The medulla in Asian scalp hair has a tubular structure that allows ions and large molecules to flow through it.
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January 2012 in “Journal of biomedical optics” Melanin density affects hair color, and this method can help in cosmetic assessments and diagnosing hair diseases.