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    Did you mean Cystine?
    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.

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    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. 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
    6. Xenobiotics in Vitro: The Influence ofL-Cystine, Pantothenat, and Miliacin on Metabolic and Proliferative Capacity of Keratinocytes Cutaneous and ocular toxicology · 2006 · 9 citations
    7. Determination of Cystine and Cysteine in Altered Human Hair Fibers Analytical Chemistry · 1947 · 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 of 49

    1. (17M) Hair loss and Cystic Acnes / Dutasteride Community · 26 Nov 2025
    2. What brand of Biotin works best for you guys that doesn’t break you out in cystic acne? Community · 24 Nov 2025
    3. Any clinical study on cysteine alone for hair loss? Reddit · 22 Mar 2025
    4. Efficacy and Tolerability of N-Acetyl-Cysteine for Treatment of The Early-onset Androgenetic Alopecia in Men Reddit · 3 Jan 2022
    5. Clinical Trial: N-Acetyl-Cysteine for Treatment of AGA in Men Reddit · 20 Jan 2021
    6. Please Help! I’m 2x with Hair Loss, and been using Minoxidil but got side effect :(( Community · 23 Oct 2025
    7. Finasteride/ Dutasteride Cured my Acne.. Anyone else? Reddit · 15 Sept 2026
    8. Protein's role in hair growth is more nuanced than just quantity Reddit · 22 Apr 2026
    9. Derma Harmony Sulfur/salicylic acid soap bar shampoo, it caused major hair loss shedding and oily scalp with acne breakout Reddit · 15 Sept 2025
    10. Can amino acids help with AGA Reddit · 1 Apr 2024
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    Learn 2

    1. L-cysteine
    2. acetyl cysteine