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    Did you mean Hair Shaft?
    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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    Research 10 of 1000+

    1. Krtap11-1, a hair keratin-associated protein, as a possible crucial element for the physical properties of hair shafts Journal of Dermatological Science · 2014 · 38 citations
    2. Secretory phospholipase A2-IIA overexpressing mice exhibit cyclic alopecia mediated through aberrant hair shaft differentiation and impaired wound healing response Scientific Reports · 2017 · 7 citations
    3. Physical and mechanical properties of the hair shaft: A review of measurement techniques to verify the efficacy of cosmetic products Seven Editora eBooks · 2024
    4. Mitochondrial DNA Variation in Human Hair Shafts Influenced by Physical Characteristics: A Massively Parallel Sequencing Analysis Genes · 2026
    5. l-Ascorbic acid 2-phosphate promotes elongation of hair shafts via the secretion of insulin-like growth factor-1 from dermal papilla cells through phosphatidylinositol 3-kinase 2009 · 34 citations
    6. A 2% Oleosome-FGF-2 Fusion Extract Scalp Serum Improves Photo-trichogramDerived Hair Density, Anagen/Telogen Ratio, Hair Shaft Thickness, and Scalp Barrier Parameters in Women with Shedding-Prone Hair: A Randomized, SingleBlind, Placebo-Controlled Pilot Study International Journal of Clinical & Experimental Dermatology · 2026
    7. Effects of ultraviolet B radiation on physicochemical properties of human hair shaft Microscopy Research and Technique · 2012 · 5 citations
    8. Comparative Studies of the Diameters of Hairshafts in Anagen and in Telogen Phases in Male Adults Without Alopecia and in Male Adults With Androgenetic Alopecia 1981 · 6 citations
    9. Angora Mouse Mutation: Altered Hair Cycle, Follicular Dystrophy, Phenotypic Maintenance of Skin Grafts, and Changes in Keratin Expression Veterinary Pathology · 1997 · 69 citations
    10. Anatomy and Physiology of Hair InTech eBooks · 2017 · 14 citations
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    Community 10 of 1000+

    1. 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
    2. FDA Policy Shift Explained: What It Actually Means for PP405, VDPHL-01, Breezula and Hair Loss Drug Timelines Reddit · 22 Feb 2026
    3. Seeking Suggestions for VEGF Gene Therapy in Hair Transplants Community · 3 Apr 2026
    4. After using finasteride, did you notice an improvement in the hair shaft in terms of looking more “alive” and shiny? Reddit · 23 Jan 2026
    5. Microneedling must reach the stem cells in the upper hair shaft Reddit · 24 Jan 2022
    6. Hair Shaft Diameter and Density Comparison Reddit · 23 Aug 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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    Learn 7 of 61

    1. Hair Multiplication extract, clone, and reinsert your own hair cells
    2. Adenosine Molecule the body uses for energy, used as a cosmetic hair-lotion ingredient
    3. Cetirizine Antihistamine allergy medicine
    4. Exosomes Tiny cell-derived particles offered by clinics as an injectable treatment
    5. Follistatin Protein that blocks activin, a growth-regulating signal
    6. Neem Oil Oil from the neem tree, used in traditional remedies
    7. Castor oil Thick plant oil used in hair care
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