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    Glossary Anagen Hair Ratio

    proportion of hair follicles in the active growth phase

    The Anagen Hair Ratio refers to the proportion of hair follicles that are in the anagen phase, which is the active growth phase of the hair cycle. A higher anagen hair ratio indicates a greater number of hair follicles are actively growing, which is typically a sign of healthy hair growth. This ratio is often used by dermatologists and trichologists to assess hair health and diagnose conditions like alopecia.

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    1. Melatonin increases anagen hair rate in women with androgenetic alopecia or diffuse alopecia: results of a pilot randomized controlled trial British Journal of Dermatology · 2004 · 78 citations
    2. Dietary supplement increases anagen hair rate in women with telogen effluvium: results of a double-blind, placebo-controlled trial Therapy · 2006 · 47 citations
    3. A comparative study on the rate of anagen effluvium and survival rates of scalp, beard, and chest hair in hair restoration procedure of scalp Journal of Cutaneous and Aesthetic Surgery · 2019 · 3 citations
    4. Gender differences in scalp hair growth rates are maintained but reduced in pattern hair loss compared to controls Skin Research and Technology · 2015 · 11 citations
    5. [Changes in telogen rate, hair density, hair diameter and rate of growth in androgenetic alopecia of the male. Simultaneously a contribution to the significance of dysplastic hair]. PubMed · 1986
    6. A 6-Month Prospective, Open-Label, Randomized Study Showing Increased Hair Growth Rate in Women Using Multi-Targeting Hair Growth Nutraceuticals Dermatology and Therapy · 2026
    7. Increased Rate of Hair Regrowth in Mice with Constitutive Overexpression of Del1 Journal of Surgical Research · 2007 · 6 citations
    8. Colorimetry provides a rapid objective measurement of <i>de novo</i> hair growth rate in mice Skin research and technology · 2009 · 4 citations
    9. Systematic approach to hair loss in women Journal der Deutschen Dermatologischen Gesellschaft · 2010 · 45 citations
    10. Effect of the multifunctional cosmetic ingredient sphinganine on hair loss in men and women with diffuse hair reduction Clinical, cosmetic and investigational dermatology · 2016 · 3 citations
    11. Evaluation of a Combination of Cystine, B Vitamins and Minerals, in the Management of Diffuse Hair Loss in Women: A Prospective, Open-Label Study Preprints.org · 2026
    12. Hormonal changes in menopause: do they contribute to a ‘midlife hair crisis’ in women? British Journal of Dermatology · 2011 · 38 citations
    13. Female patients complaining about hair loss: documentation of defective scalp hair dynamics with contrast-enhanced phototrichogram Skin Research and Technology · 2006 · 23 citations
    14. Targeted Follicular Delivery via Liposomal Encapsulation of Sesbania grandiflora - Enhances Hair and Scalp Health: A Randomized, Double-Blind, Placebo-Controlled Clinical Study DOAJ (DOAJ: Directory of Open Access Journals) · 2026
    15. Normal Hair Growth in Children Pediatric Dermatology · 1987 · 57 citations
    16. Effect of De-epithelialization on Graft Survival Rate After Follicular Unit Extraction Dermatologic Surgery · 2021 · 1 citations
    17. P33: Experimental Advances in Hair Restoration Surgery Plastic and Reconstructive Surgery · 2006
    18. Evaluating hair growth promoting effects of candidate substance: A review of research methods Journal of Dermatological Science · 2019 · 28 citations
    19. Characteristic features of Japanese women's hair with aging and with progressing hair loss Journal of Dermatological Science · 2006 · 76 citations
    20. TrichoScan: A Novel Tool For The Analysis of Hair Growth In Vivo Journal of Investigative Dermatology Symposium Proceedings · 2003 · 70 citations
    21. Characterization of X‐linked hypohidrotic ectodermal dysplasia (XL‐HED) hair and sweat gland phenotypes using phototrichogram analysis and live confocal imaging American Journal of Medical Genetics - Part A · 2013 · 15 citations
    22. Hair follicle characteristics as early marker of Type 2 Diabetes Medical Hypotheses · 2016 · 13 citations
    23. Targeted Follicular Delivery via Liposomal Encapsulation of Sesbania grandiflora - Enhances Hair and Scalp Health: A Randomized, Double-Blind, Placebo-Controlled Clinical Study Clinical Cosmetic and Investigational Dermatology · 2026
    24. The Effects of the Oral Supplementation with a Natural Keratin Hydrolysate (Kera-Diet®) on Hair and Nails: Randomized, Placebo and Benchmark-Controlled Clinical Trial on Healthy Females Trichology and cosmetology: · 2021
    25. TrichoScan: combining epiluminescence microscopy with digital image analysis for the measurement of hair growth in vivo. PubMed · 2001 · 31 citations
    26. TrichoScan®: A useful method for measuring hair growth parameters and enhancing patient selection for hair restoration surgery Hair transplant forum international · 2009 · 1 citations
    27. Why Do Not All Chemotherapy Patients Lose Their Hair? Answering an Intriguing Question Skin appendage disorders · 2021 · 1 citations
    28. Mapping cell dynamics in human ex vivo hair follicles suggests pulling mechanism of hair growth Nature Communications · 2025
    29. Efficacy and safety of oral minoxidil in comparison to topical form in male pattern hair loss Archives of Dermatological Research · 2025
    30. Chronic telogen effluvium and female pattern hair loss are separate and distinct forms of alopecia: a histomorphometric and immunohistochemical analysis Clinical and Experimental Dermatology · 2014 · 8 citations