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    Research 10 of 1000+

    1. Cystatin M/E Is a High Affinity Inhibitor of Cathepsin V and Cathepsin L by a Reactive Site That Is Distinct from the Legumain-binding Site 2006 · 100 citations
    2. Tyrosinase inhibition due to interaction of homocyst(e)ine with copper: the mechanism for reversible hypopigmentation in homocystinuria due to cystathionine beta-synthase deficiency. PubMed · 1995 · 74 citations
    3. Structure and expression of genes for a class of cysteine-rich proteins of the cuticle layers of differentiating wool and hair follicles. 1990 · 67 citations
    4. A null mutation in the cystatin M/E gene of ichq mice causes juvenile lethality and defects in epidermal cornification 2002 · 66 citations
    5. Cystoid macular oedema in uveitis: An unsolved problem Eye · 2001 · 52 citations
    6. Chemoprevention of smoke-induced alopecia in mice by oral administration of l-cystine and vitamin B6 Journal of dermatological science · 2007 · 41 citations
    7. Cysteine Prevents the Reduction in Keratin Synthesis Induced by Iron Deficiency in Human Keratinocytes Journal of Cellular Biochemistry · 2015 · 40 citations
    8. 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
    9. Gene Expression of Mouse S100A3, a Cysteine-Rich Calcium-Binding Protein, in Developing Hair Follicle 1998 · 40 citations
    10. Convergent Evolution of Cysteine-Rich Keratins in Hard Skin Appendages of Terrestrial Vertebrates Molecular biology and evolution · 2019 · 36 citations
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    Community 10 of 17

    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. Finasteride/ Dutasteride Cured my Acne.. Anyone else? Reddit · 15 Sept 2026
    7. Protein's role in hair growth is more nuanced than just quantity Reddit · 22 Apr 2026
    8. Please Help! I’m 2x with Hair Loss, and been using Minoxidil but got side effect :(( Community · 23 Oct 2025
    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