March 2023 in “Human Pathology” This review found that while follicular hair counts and ratios assist in diagnosing non-scarring alopecia, they should be used alongside specific morphological features for accurate diagnosis.
11 citations
,
September 2021 in “Skin Appendage Disorders” This study observed variability in hair density and types across different scalp areas in cadaver biopsies, providing reference values that could aid in diagnosing hair disorders in Asians.
1 citations
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February 2023 in “Siriraj Medical Journal/San Sirirat” This study found that Thai males with androgenic alopecia displayed lower average hair density in the occipital scalp compared to other Asian populations, but higher than those with advanced AGA.
July 2025 in “Journal of Dermatological Treatment” This study found that platelet-rich plasma significantly improved hair growth parameters in androgenic alopecia patients and was even more effective when combined with minoxidil, particularly in reducing vellus hair.
In this study using C3H/HeJ mice, a single subcutaneous injection of the fusion protein PTH-CBD increased anagen hair follicle counts and promoted hair regrowth comparably to daily oral ruxolitinib, potentially by enhancing beta-catenin production and stimulating anagen transition.
April 2023 in “The journal of investigative dermatology/Journal of investigative dermatology” In this study, a single subcutaneous dose of PTH-CBD showed similar hair regrowth to daily oral ruxolitinib in mice with alopecia, possibly through increased beta-catenin and anagen transition stimulation.
33 citations
,
April 2005 in “British Journal of Dermatology” This study found that age and follicular miniaturization were extremely weak predictors of total hair count in women with hair loss.
April 2025 in “Journal of Cosmetic and Laser Therapy” This study found that QR678 Neo® significantly enhanced hair regrowth, density, and shaft diameter in males with advanced androgenetic alopecia undergoing hair transplant surgery, compared to a conventional method, making it a promising adjunct treatment option.
56 citations
,
March 2015 in “Journal of Investigative Dermatology” Healthy mitochondria in skin cells are essential for proper hair growth and skin cell interaction in mice.
6 citations
,
April 2020 in “Applied sciences” This study reports that mesenchymal stem cell-conditioned medium promoted dermal cell migration and proliferation, enhancing wound healing but not direct hair growth, in vitro and in adult mouse models.
May 2021 in “Journal of Dermatology and Cosmetic” This study found that using low-power lasers on cryosurgery-induced wounds in rats can prevent hair follicle necrosis and increase hair follicle numbers, with the experimental group showing significantly more hair follicles than the control group across all time points studied.
69 citations
,
April 2019 in “Biomedicines” This study found that hair thickness and density increased after treatment with human follicle mesenchymal stem cells and platelet rich plasma, associated with enhanced Wnt signaling and platelet derived growth factors.
30 citations
,
July 2017 in “Stem cells and cloning” This study found that scalp injection of fat enriched with stem cells may offer a promising alternative for treating early genetic alopecia in both men and women.
9 citations
,
June 2008 in “Springer eBooks” Understanding hair follicle structure is key for treating hair disorders and could help develop new treatments.
April 2024 in “JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology” This study investigates the role of retinoic acid in regulating hair follicle stem cell homeostasis to identify new potential targets for treating androgenetic alopecia.
8 citations
,
February 2017 in “Archives of Dermatological Research” This study found that IPL hair reduction led to significant decreases in hair count and thickness by promoting hair follicle miniaturization, increased telogen phase, and reduced cell proliferation.
January 2022 in “Springer eBooks” Using micrografts with stem cells and platelet-rich plasma can safely and effectively help regrow hair.
1 citations
,
January 2003 in “Annals of Dermatology” This study found that hair follicles on the anterior scalp may be more vulnerable to acute telogen effluvium than those on the occipital scalp.
51 citations
,
January 2004 in “Skin Pharmacology and Physiology” This review discusses various techniques for evaluating hair shedding and alopecia but reports no new clinical results. The authors emphasize the value of specific clinical and instrumental methods in assessing hair growth.
26 citations
,
November 2005 in “Journal of Investigative Dermatology Symposium Proceedings” TrichoScan effectively measures hair growth improvements in people using minoxidil.
69 citations
,
December 2011 in “Journal of Ethnopharmacology” This study found that Carthamus tinctorius exhibited the strongest 5α-reductase inhibitory and hair growth promoting activities among evaluated Thai herbs, suggesting potential for developing alternative hair loss treatments.
14 citations
,
November 2005 in “Life sciences” This study indicates that vitamin D3 administration may protect rat hair follicles from radiation-induced damage, as evidenced by maintained follicle numbers and increased Vitamin D receptor activity in treated skin.
April 2024 in “Lasers in medical science” This study found that near-infrared LED therapy enhanced ATP synthesis, reduced reactive oxygen species, and promoted collagen production and hair growth more effectively than white LEDs in human skin cells and a photoaging mouse model.
27 citations
,
September 2012 in “Dermatologic Clinics” This review outlines a systematic method for diagnosing hair loss and presents no new findings; the authors emphasize the importance of biopsy in cicatricial alopecia cases.
3 citations
,
August 2020 in “Journal of cosmetic dermatology” In this study, a scalp care solution with 0.5% timosaponin B‐II from Anemarrhena asphodeloides significantly improved hair luster, reduced hair fall, enhanced scalp hydration, and decreased scalp redness over 28 days, suggesting benefits for scalp health and hair loss prevention.
September 2024 in “Egyptian Journal of Dermatology and Venerology” In this interventional study on female-pattern hair loss, researchers found that fractional CO2 laser therapy alone improved hair growth, as evidenced by increased hair count, thickness, density, and patient satisfaction compared to saline controls. However, the precise mechanisms behind these effects require further investigation.
September 2024 in “Journal of Microbiology and Biotechnology” In this study, the researchers found that their conductive bio-harvesting tonic enhanced hair follicle proliferation and delayed regression with electric stimulation and the antifungal agent 6-pentyl-α-pyrone in both mice and human hair follicle tests.
183 citations
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January 2014 in “BioMed Research International” This study reported that AA-PRP injections significantly increased hair count and density in individuals with pattern hair loss compared to baseline, demonstrating their potential for enhancing hair growth.
139 citations
,
July 1991 in “Journal of The American Academy of Dermatology” This article discusses the structure of hair follicles and their significance in evaluating hair disorders, but it does not report any new research findings.
15 citations
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May 2013 in “American Journal of Medical Genetics - Part A” People with X-linked hypohidrotic ectodermal dysplasia have no sweat ducts and less, thinner hair.