This study found that a blend of low- and high-molecular weight hyaluronic acid significantly improved penetration into the hair cortex compared to individual HA types, reducing frizz and increasing hair elasticity and water content, as measured by Confocal Raman Spectroscopy.
33 citations
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July 2007 in “Skin research and technology” The study found that the break force of human hair significantly depends on hair diameter and strain, but not on age, gender, use of hair dye, or drugs.
42 citations
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December 2018 in “International Journal of Phytocosmetics and Natural Ingredients” This study found that hair care formulations containing vegetable oils like Brazil nut and olive oil improved hair strength, shine, and combability more effectively than those with silicone.
May 2026 in “International Journal of Cosmetic Science” This study found that UV radiation exposure during a simulated Brazilian summer caused more significant mechanical damage to natural hair than bleaching, although both caused comparable structural alterations, with double bleaching leading to the most severe protein degradation.
42 citations
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April 2008 in “Acta materialia” This study investigated the tensile response and morphological changes of different ethnic hair types using AFM, showing variations between virgin, chemically damaged, and conditioner-treated Caucasian hair under different conditions.