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    Glossary Amino Acids

    organic compounds forming proteins, essential for biological functions

    Amino acids are organic compounds that serve as the building blocks of proteins, which are essential for various biological functions in the body. Each amino acid contains an amino group (NH2), a carboxyl group (COOH), and a unique side chain that determines its properties. There are 20 standard amino acids that combine in different sequences to form proteins, playing crucial roles in processes such as tissue repair, nutrient absorption, and enzyme function.

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    1. Content of Citrulline and Other Amino-Acids in a Protein of Hair Follicles Nature · 1958 · 88 citations
    2. Unique amino acid signatures that are evolutionarily conserved distinguish simple-type, epidermal and hair keratins Journal of Cell Science · 2011 · 76 citations
    3. Amino acid–derived defense metabolites from plants: A potential source to facilitate novel antimicrobial development Journal of Biological Chemistry · 2021 · 69 citations
    4. Trypanocidal Effect of Isotretinoin through the Inhibition of Polyamine and Amino Acid Transporters in Trypanosoma cruzi PLoS neglected tropical diseases · 2017 · 41 citations
    5. The cDNA-deduced amino acid sequence for trichohyalin, a differentiation marker in the hair follicle, contains a 23 amino acid repeat. 1990 · 39 citations
    6. Biotin deficiency in an infant fed with amino acid formula and hypoallergenic rice Acta Paediatrica · 1996 · 29 citations
    7. Metabolomic analysis of amino acids and lipids in human hair altered by dyeing, perming and bleaching Experimental Dermatology · 2016 · 24 citations
    8. Aberrant amino acid metabolism promotes neurovascular reactivity in rosacea JCI Insight · 2022 · 18 citations
    9. Annurca Apple Polyphenols Ignite Keratin Production in Hair Follicles by Inhibiting the Pentose Phosphate Pathway and Amino Acid Oxidation Nutrients · 2018 · 18 citations
    10. Amino Acids, Peptides, and Proteins Elsevier eBooks · 2017 · 5 citations
    11. Hair and amino acids: the interactions and the effects. PubMed · 2007 · 5 citations
    12. Simultaneous RP-HPLC-DAD determination of dansyl amino acids in chemically treated human hair Macedonian Journal of Chemistry and Chemical Engineering · 2018 · 4 citations
    13. 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
    14. Amino Acid Content of Damaged Human Hair 1981 · 2 citations
    15. Uptake and Utilisation of Amino Acids by Human Hair Follicles and Related Cells 1996 · 1 citations
    16. Influence of Amino Acids on the Hair Structure Before and During Chemical Treatments Universal library of medical and health sciences. · 2025
    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. Replenishing amino acids in damaged hair Journal of the American Academy of Dermatology · 2005
    20. Coacervate Formation Behavior and Lubrication Properties of a Hair Shampoo Formulated With Amino Acid Surfactants and Cationized Cellulose Journal of Surfactants and Detergents · 2025
    21. Characterization of curved hair of Japanese women with reference to internal structures and amino acid composition. PubMed · 2008 · 13 citations
    22. 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
    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. Amino Acid Compositions of Human Hair Fibrous Protein Components Purified with Two‐dimensional Electrophoresis The Journal of Dermatology · 1989 · 4 citations
    25. Effect of Liposomes Containing Antioxidant, Phospholipid, and Amino Acid on Skin Regeneration after Chemical Burn Bulletin of Experimental Biology and Medicine · 2009 · 2 citations
    26. A prospective real-world study evaluating serum levels of arginine and cysteine in women with chronic telogen effluvium: do we really need blanket prescription of amino acid supplementation? Clinical and Experimental Dermatology · 2022 · 1 citations
    27. Amino Acid as Hair Repair Agent: Unraveling its Mechanism of Interaction with Keratin Fibers and Polymers · 2026
    28. Comment on 'A prospective real world study evaluating serum levels of arginine and cysteine in females with chronic telogen effluvium: do we really need blanket prescription with amino acid supplementation?' Clinical and Experimental Dermatology · 2022
    29. <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
    30. Hair Amino Acids: Normal Values and Results in Metabolic Errors Archives of disease in childhood · 1970 · 15 citations