23 citations
,
December 1991 in “Annals of the New York Academy of Sciences” This study reported that human balding scalp grafted onto nude mice showed reduced linear growth rates of both vellus and terminal hairs.
11 citations
,
November 2015 in “Skin Research and Technology” This study found that individuals with patterned hair loss, both male and female, showed a slower linear hair growth rate compared to controls with hair of equal thickness.
7 citations
,
September 2014 in “European Journal of Dermatology” This study found a significant positive correlation between hair thickness and growth rate, with a notably slower growth rate observed in men with male pattern hair loss compared to healthy controls.
April 2024 in “Journal of wildlife diseases” This study reported that captive muskoxen in Fairbanks, Alaska have significantly faster and variable guard hair growth rates compared to free-ranging Greenland muskoxen, indicating that a universal hair growth rate cannot be applied across different muskox populations or time periods.
January 2025 in “Conservation Physiology” This study developed and tested two methods to accurately quantify hair growth rates in polar, black, and grizzly bears using dye application and isotopically labelled amino acids, revealing growth rate variations by individual and season.
May 2023 in “General and comparative endocrinology” This study found that hair cortisol concentrations in rhesus macaques were not significantly correlated with hair growth rate, suggesting that cortisol-mediated inhibition of hair growth does not explain higher cortisol levels within the non-stress range.
This study found that plucked hair follicles exhibited a higher growth rate than conventional one-hair micrografts in vitro, suggesting they may be a less invasive alternative for hair transplantation.
This study observed that in men with androgenetic alopecia, frontal hair regions showed reduced density, diameter, and growth rate compared to occipital regions, worsening with advanced stages.
21 citations
,
January 2016 in “NeuroImmunoModulation” This study found that daily hair washing was associated with significantly lower hair cortisol concentrations, suggesting it may influence the accuracy of using hair cortisol as a biomarker for chronic stress.
7 citations
,
May 1979 in “Medical & biological engineering & computing” The trichometer accurately measures hair growth and is easy to use.
1 citations
,
September 2016 in “Brain Behavior and Immunity” Hair cortisol levels can indicate stress and are affected by washing frequency, not cosmetic treatments.
1 citations
,
January 2016 in “Hair therapy & transplantation” In this study, male participants with early androgenetic alopecia experienced a significant increase in hair growth rate after applying topical lipoid cepharanthine lotion for six months.
July 2026 in “Dermatology and Therapy” In this study, women experiencing hair thinning who consumed tailored botanical-based nutraceuticals saw significant increases in linear hair growth rate and other hair health parameters over 90 and 180 days, supporting their effectiveness across different life stages.
26 citations
,
December 1981 in “British journal of dermatology/British journal of dermatology, Supplement” This study observed that most hirsute patients on combined cyproterone acetate and 'Diane' therapy experienced a reduction in hair growth, with hair becoming softer, thinner, and lighter in color over 12 months.
5 citations
,
September 2023 in “Pediatric Research” 
4 citations
,
October 2009 in “Skin research and technology” This study found that tristimulus colorimetry is a sensitive and quantitative method for projecting hair growth rates in depilated mice, and it observed that 890 nm LED irradiation promotes hair regrowth.
29 citations
,
May 1975 in “Clinical Endocrinology” In this study, treatments combining betamethasone and anovulatory steroids significantly reduced testosterone production in women with hirsutism, with many reporting improved hirsutism and acne, although clinical benefit did not consistently correlate with testosterone reduction.
4 citations
,
January 2022 in “Journal of nanomaterials” In this study, silver nanoparticles prepared using Ziziphus nummularia fruit extract showed higher hair growth activity and were more effective against Gram-positive bacteria compared to other extracts.
August 2024 in “Siberian Journal of Life Sciences and Agriculture” In this study, researchers found that both oral and percutaneous applications of melatonin and lyotritone in laboratory rats enhanced hair quality and growth rate compared to a control group, which showed slower hair growth and lower hair quality.
January 2024 in “ResearchWorks at the University of Washington (University of Washington)” This study found that while measuring zinc in hair did not allow calculation of individual hair growth rates, it effectively characterized zinc, lead, and mercury concentrations and improved methods for analyzing these exposures using LA-ICP-MS.
1 citations
,
January 2015 in “Trace Elements in Medicine (Moscow)” This case study reports that different organs, such as hair and stature, may grow at varying rates during different stages of growth.
January 2026 in “Journal of Nanomaterials” 2 citations
,
May 1981 in “Journal of Animal Science” The researchers concluded that while swine hair mineral content is influenced by dietary levels, the variability and interaction between minerals suggest it may not be a reliable indicator of an animal's overall mineral composition.
70 citations
,
June 2003 in “Journal of Investigative Dermatology Symposium Proceedings” This study reports that the TrichoScan method effectively measures hair growth parameters and detected significant improvements in hair counts and thickness in men with androgenetic alopecia after finasteride treatment.
57 citations
,
November 1987 in “Pediatric Dermatology” This article reviews common hair growth abnormalities in children, emphasizing the importance of distinguishing normal development from potential signs of metabolic disorders and indicates no new clinical results.
28 citations
,
March 2019 in “Journal of Dermatological Science” This review discusses methods for evaluating hair growth-promoting effects of candidate substances for androgenetic alopecia, focusing on cell assays, organ cultures, and animal models, and reports no new results.
11 citations
,
January 2017 in “Evidence-based Complementary and Alternative Medicine” This study investigated the effects of the herbal formulation DA-5512 on hair growth, finding that it significantly promotes dermal papilla cell proliferation and stimulates hair growth in mice while showing efficacy and safety in human trials compared to placebo and minoxidil (3%).
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.
31 citations
,
August 2001 in “PubMed” This study found that the TrichoScan method detected significant increases in hair counts and cumulative hair thickness in men after finasteride treatment, suggesting its potential for monitoring hair treatment responses.
3 citations
,
January 1994 in “Journal of Society of Cosmetic Chemists of Japan” This study found that a hair tonic increased hair growth and reduced resting hair ratios in men with alopecia.