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    Glossary Hair Shaft

    visible part of hair extending above the skin's surface

    The hair shaft is the visible part of the hair that extends above the skin's surface. It is composed of three layers: the cuticle (outer layer), the cortex (middle layer), and the medulla (inner layer). The hair shaft is primarily made of keratin, a protein that provides strength and resilience. Understanding the structure of the hair shaft is crucial for professionals in dermatology and cosmetology, as it influences hair health, texture, and response to treatments.

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    Community 10 of 1000+

    1. After using finasteride, did you notice an improvement in the hair shaft in terms of looking more “alive” and shiny? Reddit · 23 Jan 2026
    2. Microneedling must reach the stem cells in the upper hair shaft Reddit · 24 Jan 2022
    3. Recent trials investigating mesenchymal stem cell derived exosomes demonstrate significant increases in anagen duration and hair shaft caliber by upregulating Wnt/beta-catenin pathways. Reddit · 24 Aug 2026
    4. Hair Shaft Diameter and Density Comparison Reddit · 23 Aug 2026
    5. FDA Policy Shift Explained: What It Actually Means for PP405, VDPHL-01, Breezula and Hair Loss Drug Timelines Reddit · 22 Feb 2026
    6. Seeking Suggestions for VEGF Gene Therapy in Hair Transplants Community · 3 Apr 2026
    7. Has anyone here tried topical synthetic prostaglandins (Bimatoprost, Latanoprost, cetirizine) to stimulate hair growth? Reddit · 15 Aug 2024
    8. Has anyone tried Redensyl instead of Minoxidil in combination with Finasteride? Reddit · 25 Oct 2023
    9. GHK-Cu helping with reducing hairloss Reddit · 7 Aug 2026
    10. Will these bad boys ever thicken up? I feel like they're getting there. Reddit · 16 Aug 2024
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    Research 10 of 1000+

    1. Dihydrotestosterone-Inducible IL-6 Inhibits Elongation of Human Hair Shafts by Suppressing Matrix Cell Proliferation and Promotes Regression of Hair Follicles in Mice Journal of Investigative Dermatology · 2011 · 173 citations
    2. `Cyclic alopecia' in<i>Msx2</i>mutants: defects in hair cycling and hair shaft differentiation Development · 2002 · 158 citations
    3. Mutations in Three Genes Encoding Proteins Involved in Hair Shaft Formation Cause Uncombable Hair Syndrome American journal of human genetics · 2016 · 119 citations
    4. Hair Shafts in Trichoscopy Dermatologic Clinics · 2013 · 86 citations
    5. The disruption of Sox21-mediated hair shaft cuticle differentiation causes cyclic alopecia in mice Proceedings of the National Academy of Sciences · 2009 · 73 citations
    6. Resistance of degraded hair shafts to contaminant DNA Forensic Science International · 2005 · 69 citations
    7. Human hair shaft proteomic profiling: individual differences, site specificity and cuticle analysis PeerJ · 2014 · 68 citations
    8. Dermatoscopy of hair shaft disorders Journal of the American Academy of Dermatology · 2012 · 68 citations
    9. Lamellar ichthyosis, dwarfism, mental retardation, and hair shaft abnormalities Journal of the American Academy of Dermatology · 1980 · 61 citations
    10. Differential effects of caffeine on hair shaft elongation, matrix and outer root sheath keratinocyte proliferation, and transforming growth factor‐β2/insulin‐like growth factor‐1‐mediated regulation of the hair cycle in male and female human hair follicles<i>in vitro</i> British Journal of Dermatology · 2014 · 60 citations
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    Learn 10 of 61

    1. Hair Multiplication extract, clone, and reinsert your own hair cells
    2. Castor oil Thick plant oil used in hair care
    3. Adenosine Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient
    4. Cetirizine Antihistamine allergy medicine
    5. Exosomes Tiny cell-derived particles offered by clinics as an injectable treatment
    6. Low Level Laser Therapy Red-light devices, such as caps, combs and helmets, used on the scalp
    7. Follistatin Protein that blocks activin, a growth-regulating signal
    8. Neem Oil Oil from the neem tree, used in traditional remedies
    9. Hair Fibers cosmetic product that temporarily makes hair appear thicker
    10. Hair Transplant Surgery that moves hair follicles from the back of the scalp to thinning areas
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