Prussian Blue causes hair cuticles to detach, weakening the hair.
November 2025 in “Eurasian journal of applied biotechnology” Combining L-cysteine, NAC, and a MET inhibitor significantly kills cervical cancer cells.
March 2021 in “Juniper Online Journal Material Science” Energy healing treatment improved L-cysteine's stability, solubility, bioavailability, and shelf-life.
January 2019 in “Journal of cosmetology & trichology” L-Cystine and L-Cystine with Kera-Diet® safely improved hair and nail quality in healthy women.
3 citations
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January 2017 in “Journal of cosmetology & trichology” The food supplement with L-cystine, Serenoa repens extract, and biotin safely reduced hair loss and improved hair growth in men and women.
September 2024 in “Journal of the American Academy of Dermatology” The supplements improved hair density and reduced hair loss.
July 2024 in “Skin Appendage Disorders” The supplement significantly improves hair density and appearance in people with hair loss.
June 2023 in “Italian journal of dermatology and venereology” The oral supplement improved hair loss in patients with telogen effluvium.
51 citations
,
January 2004 in “European Journal of Cell Biology” Human cathepsin V can replace mouse cathepsin L to maintain normal skin and hair in mice.
10 citations
,
November 2018 in “Genetics in medicine” Lack of cystatin M/E causes thin hair and dry skin.
May 2018 in “International journal of clinical obstetrics and gynaecology” N-acetyl cysteine and metformin both improved fertility in women with PCOS equally, but N-acetyl cysteine had fewer side effects.
October 2021 in “QJM: An International Journal of Medicine” N-acetyl-cysteine improves hair growth and is safe for treating early male hair loss.
32 citations
,
January 1966 in “Archives of Dermatology” The method accurately measures hair growth with minimal risk and is better than other techniques.
7 citations
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January 1966 in “Archives of Dermatology” The method accurately measures hair growth with minimal risk and is better than other methods.
6 citations
,
January 1998 in “Journal of applied cosmetology” 35 citations
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September 1994 in “Journal of Investigative Dermatology”
September 2019 in “The journal of investigative dermatology/Journal of investigative dermatology” Not having enough cystatin M/E protein causes less hair growth and dry skin.
January 2007 in “Leather Science and Engineering” 1 citations
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January 2004 in “Adelaide Research & Scholarship (AR&S) (University of Adelaide)” SPARC likely aids in tissue remodeling during the hair cycle, not in starting new hair growth phases.
1 citations
,
January 1971 in “Acta dermato-venereologica” Mice hair follicles take in the amino acid cystine.
4 citations
,
December 1962 in “European journal of endocrinology” Alloxan diabetes, methylthiouracil, cortisone, and adrenaline affect how white mice hair follicles use glucose and cystine and their cell division.
226 citations
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January 2006 in “International review of cytology” Keratin-associated proteins are crucial for hair strength and structure.
140 citations
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August 2010 in “Pigment Cell & Melanoma Research” We know a lot about mouse hair color, but not much about human hair color differences.
73 citations
,
June 2006 in “Animal genetics” The FGF5 gene determines hair length in dogs.
62 citations
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January 2004 in “The journal of investigative dermatology/Journal of investigative dermatology” A second domain of high sulfur KAP genes on chromosome 21q23 is crucial for hair structure.
38 citations
,
May 2000 in “Livestock production science” Giving high-quality protein or methionine supplements helps improve hair growth in Angora goats and, to a lesser extent, in Cashmere goats.
36 citations
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October 2014 in “Langmuir” Bleaching hair removes its protective top layer and exposes more hydrophilic groups, changing its chemical surface and affecting how it interacts with products.
34 citations
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September 2007 in “Experimental Dermatology” The outer layer of Merino wool is rich in sulfur proteins, making it resistant to damage.
31 citations
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January 2004 in “Methods in cell biology” Hair and follicle keratins differ in structure and expression, especially in cysteine content.