April 2024 in “Cosmetics” Different oils affect hair flexibility and strength, with their impact varying on whether hair is virgin or bleached.
2 citations
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July 2023 in “Cosmetics” In this study, researchers highlighted that while hair lipids are crucial for hair health and protection, surfactants in shampoos and conditioners can partially remove these lipids, potentially affecting hair structure, though the exact mechanisms remain poorly understood and require further investigation.
September 2022 in “KnE medicine” This study found that hair tonic nanoemulsions containing 1%, 2%, and 3% argan oil promoted hair growth in mice over 21 days.
This chapter provides an overview of the complex chemical and physical structure of the hair surface, detailing how factors like ethnicity, environmental stress, and cosmetic treatments can alter its properties and influence the adhesion of hair care products.
7 citations
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September 2020 in “International Journal of Cosmetic Science” This study investigated the effects of wool-derived hydrolysed keratin peptides on relaxed textured hair and found that mid- and high-molecular weight peptides improved mechanical strength and reduced breakage in different humidity conditions.
27 citations
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May 2019 in “Cosmetics” This review explores the structure and development of the hair cuticle, highlighting difficulties in studying some aspects and proposing new experimental approaches, but reports no new clinical results.
25 citations
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May 2019 in “Cosmetics” This paper reviews the surface degradation of hair and describes how combining 18-MEA with specific surfactants can maintain hydrophobicity on bleached and weathered hair surfaces.
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.
30 citations
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September 2018 in “International Journal of Cosmetic Science” In this study, researchers observed that cosmetic peroxide bleaching causes oxidative damage and protein loss in human hair, not only affecting the cuticle but also deeper cortical structures, correlating with bleaching severity.
7 citations
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April 2018 in “Cosmetics” This study found that the medulla of Japanese hair contains unsaturated lipids such as squalene and oleic acid, which may contribute to hair glossiness.
96 citations
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April 2017 in “Oncotarget” This study found that nanoemulsions of different sizes vary in their ability to penetrate skin layers, with smaller sizes aiding transdermal delivery and potential applications in transcutaneous immunization.
11 citations
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January 2016 in “Biointerphases” This study suggests that the outermost hair cuticle surface is rich in 18-methyleicosanic acid (18-MEA), supporting previous findings of its multilayer lipid and protein structure.
18 citations
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August 2014 in “Lipids” This study found that unsaturated fatty acids are more abundant in the cortex of human hair than on its surface, and steryl glycoside-like lipids may help bind the cuticle to the cortex.
59 citations
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January 2013 in “Annals of Dermatology” In this study, researchers found that Asian hair contains more integral lipids than European or African hair, which may protect it better from UV-induced damage.
7 citations
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December 2011 in “Springer eBooks” I'm sorry, but I can't provide a summary without the content of the document.
263 citations
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February 2011 in “Journal of Controlled Release” This study found that medium-sized particles (643 and 646 nm) penetrated deeper into porcine hair follicles in vitro than smaller or larger particles, suggesting size-selective targeting within follicular sites.
46 citations
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January 2010 in “The journal of investigative dermatology/Journal of investigative dermatology” This study found that Insig deficiency in the skin of mice causes cholesterol precursors to accumulate, leading to defective hair development and skin abnormalities, which were alleviated by simvastatin treatment.
11 citations
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January 2006 in “International Journal of Cosmetic Science” Some oils can penetrate hair and reduce the stickiness between fibers, but mineral oil cannot.
2 citations
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January 2006 in “International Journal of Cosmetic Science” This study investigated the penetration of a low-molecular-weight cationic conditioning compound into the hair cortex and suggests it may improve hair's fatigue resistance.
30 citations
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November 2005 in “The journal of investigative dermatology. Symposium proceedings/The Journal of investigative dermatology symposium proceedings” This study discovered that the lipid in human hair follicles is mainly located in the hair cuticle and keratinized inner root sheath, distinct from sebaceous and epidermal lipids, suggesting a potential role as a "hair barrier.
3 citations
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September 2005 in “International Journal of Cosmetic Science” This study found that monounsaturated oils like olive oil penetrate hair fibers effectively, whereas polyunsaturated oils typically do not penetrate beyond the cuticle.
10 citations
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March 2005 in “International Journal of Cosmetic Science” This study found that photochemical and cosmetic chemical oxidation of hair causes surface damage by delipidation and acid formation, which can be characterized and quantified using microfluorometry and X-ray photoelectron spectroscopy.
11 citations
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June 2001 in “PubMed” Coconut oil can penetrate hair better than mineral oil, potentially protecting against damage.
86 citations
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January 1996 in “Clinics in dermatology” This review discusses the effects of protein-based cosmetics on hair properties and reports no new research findings, suggesting potential benefits for developing advanced, sustainable hair products.