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    Glossary Cystine

    amino acid formed by linking two cysteine molecules

    Cystine is an amino acid that forms when two cysteine molecules are linked by a disulfide bond. It is important for the structural stability of proteins, particularly in keratin, which is a key component of hair, skin, and nails. This bond helps maintain the strength and rigidity of these proteins, contributing to the overall health and resilience of hair and other tissues.

    Related Terms

    Learn 2

    1. L-cysteine
    2. acetyl cysteine

    Research 10 of 1000+

    1. Chemoprevention of smoke-induced alopecia in mice by oral administration of l-cystine and vitamin B6 Journal of dermatological science · 2007 · 41 citations
    2. Ultrastructural Localization of S100A3, a Cysteine-rich, Calcium Binding Protein, in Human Scalp Hair Shafts Revealed by Rapid-freezing Immunocytochemistry Journal of Histochemistry & Cytochemistry · 1999 · 40 citations
    3. [Low dosage retinol and L-cystine combination improve alopecia of the diffuse type following long-term oral administration]. PubMed · 1989 · 16 citations
    4. Cystine-thiamin-containing hair-growth formulation modulates the response to UV radiation in an in vitro model for growth-limiting conditions of human keratinocytes Journal of Photochemistry and Photobiology B-biology · 2018 · 9 citations
    5. Xenobiotics in Vitro: The Influence ofL-Cystine, Pantothenat, and Miliacin on Metabolic and Proliferative Capacity of Keratinocytes Cutaneous and ocular toxicology · 2006 · 9 citations
    6. Determination of Cystine and Cysteine in Altered Human Hair Fibers Analytical Chemistry · 1947 · 9 citations
    7. Application of XANES profiles to X-ray spectromicroscopy for biomedical specimens: Part II. Mapping oxidation state of cysteine in human hair Journal of X-ray science and technology · 2011 · 9 citations
    8. Utilization of L-Cystine and L- and D-Methionine by Mink during the Period of Intensive Hair Growth Acta agriculturae Scandinavica · 1982 · 7 citations
    9. The Influence of Electrode Potentials on the Extent of Reduction of Cystine in Hair Fibers by Reducing Agents Textile Research Journal · 1955 · 4 citations
    10. Dissecting hair breakage in alopecia areata: the central role of dysregulated cysteine homeostasis Amino Acids · 2024 · 3 citations
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    Community 10

    1. Any clinical study on cysteine alone for hair loss? Reddit · 22 Mar 2025
    2. Efficacy and Tolerability of N-Acetyl-Cysteine for Treatment of The Early-onset Androgenetic Alopecia in Men Reddit · 3 Jan 2022
    3. Clinical Trial: N-Acetyl-Cysteine for Treatment of AGA in Men Reddit · 20 Jan 2021
    4. Please Help! I’m 2x with Hair Loss, and been using Minoxidil but got side effect :(( Community · 23 Oct 2025
    5. Protein's role in hair growth is more nuanced than just quantity Reddit · 22 Apr 2026
    6. Can amino acids help with AGA Reddit · 1 Apr 2024
    7. This may be common news to some, but I’ve just learned the importance of amino acids for hair growth / strength. Reddit · 28 Sept 2022
    8. Losing ground after 14 months of fin use and 11 months of min Reddit · 20 Jul 2022
    9. Has anyone tried collagen supplements? Reddit · 9 Apr 2017
    10. Let Me Sell You on NAC Reddit · 23 Apr 2019