July 2009 in “International Journal of Cosmetic Science” Japanese women's curved hair has an uneven internal structure and varied amino acid composition.
March 2005 in “Journal of the American Academy of Dermatology” Adding amino acids to damaged hair can improve its strength and appearance.
December 2025 in “Advanced Healthcare Materials” The composite helps hair growth and scalp healing by reducing stress and inflammation.
80 citations
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December 1996 in “Pain” Disruption of glycinergic circuits increases pain sensitivity, suggesting new pain treatment options.
38 citations
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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.
28 citations
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September 2002 in “The Journal of Comparative Neurology” Presynaptic inhibition of certain nerve fibers in cats is mainly controlled by GABA and glycine.
16 citations
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October 2009 in “Xenobiotica” The tested hair dye ingredients do not form harmful oxidized metabolites in the liver.
15 citations
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October 1970 in “Archives of disease in childhood” Hair amino acid levels can indicate metabolic disorders.
14 citations
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November 2015 in “Annals of the New York Academy of Sciences” Changing the diet of mice lacking the enzyme CBS can affect symptoms related to the genetic condition.
10 citations
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March 2016 in “Toxicology and applied pharmacology” Using A132 hair dye with sunlight can cause skin damage and hair loss.
August 2025 in “Frontiers in Nutrition” Leucine levels may affect hair loss after bariatric surgery.
March 2022 in “Annals of Bariatric Surgery” Protein supplements with zinc, iron, and B vitamins reduce hair loss after sleeve gastrectomy.
3 citations
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July 2019 in “Journal of Cosmetic Dermatology” New shampoo with tyramine hydrochloride reduces hair loss by making a small muscle in the hair follicle contract.
238 citations
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May 1989 in “Journal of Investigative Dermatology”
12 citations
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August 1984 in “Genetics Research” The N gene affects the protein makeup of mouse hair.
11 citations
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November 1966 in “Experimental Biology and Medicine” Hair diameter can indicate protein status in malnourished children if sample location is controlled.
8 citations
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July 1997 in “Archives of Gerontology and Geriatrics” 5 citations
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January 2011 in “International Journal of Cosmetic Science” 1,2,3,4-tetrahydroquinoline compounds are great for stable, pure blue hair dye.
February 2025 in “International Journal of Cosmetic Science” A new amino acid derivative, ATS, improves hair texture and moisture, making it easier to straighten curly hair.
Using enzymes to link proteins makes hair repair treatments more effective and long-lasting.
43 citations
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April 2005 in “The Journal of Dermatology” Biotin supplements improved skin and hair in a biotin-deficient infant on amino acid formula.
43 citations
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May 1999 in “Journal of Biological Chemistry” Agouti protein affects melanocortin receptors through competitive antagonism and receptor down-regulation.
1 citations
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April 1977 in “Munich Personal RePEc Archive (Ludwig Maximilian University of Munich)”
January 2011 in “Yearbook of Dermatology and Dermatologic Surgery” Hair relaxers are linked to reduced cystine levels and potential hair damage.
January 1974 in “Nippon Nōgei Kagakukaishi/Nihon Nougei Kagakkaishi” Applying L-methionine and L-serine to the skin promotes the most hair growth.
99 citations
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August 1998 in “Pain” Blocking GABA(A) receptors increases neuron sensitivity, showing GABA and glycine have different roles in pain.
11 citations
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December 2017 in “Orphanet Journal of Rare Diseases” A new mutation in the ST14 gene broadens the understanding of ichthyosis-hypotrichosis syndrome.
1 citations
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December 2007 in “Journal of Microbiology and Biotechnology” Minoxidil in triamino alpha-cyclodextrin promotes hair growth effectively.
January 2023 in “Side effects of drugs annual” Some vitamins, amino acids, and alternative medicines can cause serious side effects, including bone, muscle, and skin issues, and healthcare professionals should be aware of these risks.
June 2015 in “Han'gug eung'yong saengmyeong hwa haghoeji/Journal of the Korean Society for Applied Biological Chemistry” Some synthesized peptides improved cell growth better than thymosin β4, VEGF, and minoxidil.