TLDR UV radiation damages hair by creating holes and peeling cuticle layers.
The study concluded that UV radiation caused significant damage to human hair by creating cuticle holes and peeling off cuticle layers. This damage was attributed to the oxidation of linoleic acid, a polyunsaturated fatty acid present between the cuticle layers, leading to the production of highly reactive hydroxy radicals. These radicals were responsible for forming cuticle holes and overall hair damage. The findings emphasized the importance of protecting hair from UV exposure to maintain its structural integrity and appearance.
11 citations,
January 2016 in “Biointerphases” The hair's outermost surface has multiple layers of lipids and proteins.
13 citations,
September 2014 in “Journal of photochemistry and photobiology. B, Biology” UV radiation increases protein loss from hair and reduces hair protein quality.
18 citations,
August 2014 in “Lipids” Human hair has more unsaturated fats inside than on the surface, and certain lipids may help bind the outer and inner layers together.
3 citations,
February 2023 in “ACS omega” Grape seed oil improved hair quality the most, followed by rosehip and safflower seed oils, and reduced damage from shampoo.
1 citations,
December 2022 in “Middle East Journal of Science” Permanent hair dyes use chemicals that react with hydrogen peroxide to create color.
83 citations,
August 2020 in “Resources” Macroalgae compounds offer sustainable, effective benefits for cosmetics.
January 2017 in “Springer eBooks” The document explains various skin conditions and their treatments.
2 citations,
July 2023 in “Cosmetics” Surfactants in shampoos and conditioners remove some but not all lipids from hair, and more research is needed to understand their full impact.
