September 2025 in “International Journal of Cosmetic Science” Friction causes hair breakage during combing, and fragment count predicts hair strength.
45 citations
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February 2002 in “International Journal of Cosmetic Science” Ceramide helps protect African–American hair from breakage.
1 citations
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October 2017 in “ecancermedicalscience” Breast cancer alters specific molecular structures in hair, which revert after cancer removal.
2 citations
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September 2008 in “International Journal of Cosmetic Science” Brushing causes more long hair breaks than combing, especially with bleached or wet hair.
4 citations
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September 2003 in “Livestock Production Science” Epidermal growth factor reduces hair growth, but cortisol does not.