Effects of Topical Royal Jelly Extract on Hair Quantity and Quality of Individuals with Self-Perceived Hair Thinning: A Randomized Double-Blind Placebo-Controlled Trial

    August 2026 in “ Clinical Traditional Medicine and Pharmacology ”
    Ryo Takahashi, Chizuru Fujikura, Hideto Okamoto … Kayoko Numano
    Studysummary In this study, a royal jelly formulation applied for 12 weeks led to significant improvements in hair elongation and gloss among individuals with self-perceived hair thinning, although changes in hair density were mild compared to placebo.
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    Research cited in this study 12

    1. The Effectiveness of Medicated Hair Tonic Containing Royal Jelly Extract Journal of Society of Cosmetic Chemists of Japan · 2024
    2. The Emergent Power of Human Cellular vs Mouse Models in Translational Hair Research Stem Cells Translational Medicine · 2022
    3. Scalp Condition Impacts Hair Growth And Retention Via Oxidative Stress International journal of trichology · 2018
    4. A New Classification of Early Female Pattern Hair Loss International Journal of Trichology · 2018
    5. Hair Camouflage: A Comprehensive Review International Journal of Women's Dermatology · 2017
    6. Hair Follicle Aging Is Driven by Transepidermal Elimination of Stem Cells via COL17A1 Proteolysis Science · 2016
    7. Towards a Consensus on How to Diagnose and Quantify Female Pattern Hair Loss – The Female Pattern Hair Loss Severity Index (FPHL-SI) Journal of The European Academy of Dermatology and Venereology · 2015
    8. Hair Cosmetics: An Overview International journal of trichology · 2015
    9. Is Trichoscopy a Reliable Tool to Diagnose Early Female Pattern Hair Loss? International Journal of Trichology · 2013
    10. Chronological Aging of Human Hair Keratin Fibers International Journal of Cosmetic Science · 2010
    11. Healthy Hair: What Is It? ˜The œjournal of investigative dermatology. Symposium proceedings/˜The œJournal of investigative dermatology symposium proceedings · 2007
    12. Hair Follicle Stem Cells: Insights from the 2003 Workshop ˜The œjournal of investigative dermatology. Symposium proceedings/˜The œJournal of investigative dermatology symposium proceedings · 2003