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    1. Hair Amino Acids: Normal Values and Results in Metabolic Errors Archives of disease in childhood · 1970 · 15 citations
    2. Influence of Amino Acids on the Hair Structure Before and During Chemical Treatments Universal library of medical and health sciences. · 2025
    3. Unique amino acid signatures that are evolutionarily conserved distinguish simple-type, epidermal and hair keratins Journal of Cell Science · 2011 · 76 citations
    4. Protein and sulphur amino acid nutrition of hair fibre-producing Angora and Cashmere goats Livestock production science · 2000 · 38 citations
    5. Replenishing amino acids in damaged hair Journal of the American Academy of Dermatology · 2005
    6. Novel amino acid‐based surfactant for silicone emulsification and its application in hair care products: a promising alternative to quaternary ammonium cationic surfactants International Journal of Cosmetic Science · 2017 · 12 citations
    7. Hair and amino acids: the interactions and the effects. PubMed · 2007 · 5 citations
    8. Metabolomic analysis of amino acids and lipids in human hair altered by dyeing, perming and bleaching Experimental Dermatology · 2016 · 24 citations
    9. Simultaneous RP-HPLC-DAD determination of dansyl amino acids in chemically treated human hair Macedonian Journal of Chemistry and Chemical Engineering · 2018 · 4 citations
    10. Amino Acid Content of Damaged Human Hair 1981 · 2 citations
    11. Coacervate Formation Behavior and Lubrication Properties of a Hair Shampoo Formulated With Amino Acid Surfactants and Cationized Cellulose Journal of Surfactants and Detergents · 2025
    12. Content of Citrulline and Other Amino-Acids in a Protein of Hair Follicles Nature · 1958 · 88 citations
    13. The cDNA-deduced amino acid sequence for trichohyalin, a differentiation marker in the hair follicle, contains a 23 amino acid repeat. 1990 · 39 citations
    14. Annurca Apple Polyphenols Ignite Keratin Production in Hair Follicles by Inhibiting the Pentose Phosphate Pathway and Amino Acid Oxidation Nutrients · 2018 · 18 citations
    15. An assessment of hair loss ameliorating effect of medicinal plant extracts, amino acid and vitamin complex in human subject Korean Journal of Human Ecology · 2012 · 3 citations
    16. Uptake and Utilisation of Amino Acids by Human Hair Follicles and Related Cells 1996 · 1 citations
    17. Amino Acids Oral Treatment for the Amelioration of Skin, Hair, and Nails Conditions: An Open-Label Study Current research in nutrition and food science · 2024
    18. Efficacy and tolerability of an oral supplement containing amino acids, iron, selenium, and marine hydrolyzed collagen in subjects with hair loss (androgenetic alopecia, AGA or FAGA or telogen effluvium). A prospective, randomized, 3‐month, controlled, assessor‐blinded study Skin Research and Technology · 2023
    19. Improved Humidity-Resistant Hair Straightening Using a Cysteamine-Derived Amino Acid Compound Preprints.org · 2026
    20. Amino Acid Compositions of Human Hair Fibrous Protein Components Purified with Two‐dimensional Electrophoresis The Journal of Dermatology · 1989 · 4 citations
    21. Characterization of curved hair of Japanese women with reference to internal structures and amino acid composition. PubMed · 2008 · 13 citations
    22. Diameter and Amino Acid Changes in Hair of Negro Children with Protein-Calorie Malnutrition. Experimental Biology and Medicine · 1966 · 11 citations
    23. Investigation of Some Amino Acid Analogues and Metabolites as Inhibitors of Wool and Hair Growth Australian journal of biological sciences · 1983 · 5 citations
    24. <i>J. Cosmet. Sci., </i>59, 263–289 (July/August 2008) Characterization of curved hair of Japanese women with reference to internal structures and amino acid composition International Journal of Cosmetic Science · 2009
    25. ‘Relaxers’ damage hair: Evidence from amino acid analysis Yearbook of Dermatology and Dermatologic Surgery · 2011
    26. Synthesis of a new amino acid derivative with long‐lasting hair shape control effects and elucidation of its mechanisms International Journal of Cosmetic Science · 2025
    27. Enzymatic Crosslinking of Amino Acids Improves the Repair Effect of Keratin on Hair Fibre Polymers · 2023
    28. Evaluation effects of essential amino acids and zinc and iron supplementation on the prevention of early hair loss after sleeve gastrectomy Annals of Bariatric Surgery · 2022
    29. Amino Acid as Hair Repair Agent: Unraveling its Mechanism of Interaction with Keratin Fibers and Polymers · 2026
    30. Protein and amino acid composition of hair from mice carrying the naked (<i>N</i>) gene Genetics Research · 1984 · 12 citations