18 citations
,
November 2010 in “Journal of morphology” This research examined the ultrastructure of deer hair fibers and found significant variations in diameter, cuticle thickness, and intermediate filament arrangements among different fiber types.
11 citations
,
January 2020 in “Skin appendage disorders” This study reviewed clinical trials and found that low-level laser therapy significantly increased hair diameter or density in both men and women with pattern hair loss compared to a sham device, though the involvement of industry relationships in some studies suggests cautious interpretation.
5 citations
,
October 2020 in “Lasers in Medical Science” This study found that combination therapy with LLLT and 5% minoxidil improved hair diameter and density more effectively than each treatment alone in women with female pattern hair loss.
4 citations
,
January 2000 in “Durham e-Theses (Durham University)” This study found that anagen skin in PVG rats showed significantly smaller wound diameters compared to telogen skin at 7 and 8 days after wounding, suggesting the importance of hair follicle dermal components in wound healing.
1 citations
,
December 2022 in “Archives of Dermatological Research” This study reported significant improvements in hair density, diameter, and patient satisfaction after using non-enzymatic stromal vascular fraction treatment for androgenic alopecia over six months.
1 citations
,
January 2019 in “PubMed” This study found that transgenic mice expressing cgVEGF164 had increased hair follicle diameter and density, potentially linked to higher phosphorylation levels of ERK1/2, AKT1, and LEF1 proteins.
1 citations
,
October 1997 in “PubMed” This study found that both finasteride and flutamide significantly decreased hirsutism severity and hair diameter in women with PCOS and Idiopathic Hirsutism, with abdominal hairs showing greater sensitivity to the treatments.
April 2025 in “Journal of Oncology Pharmacy Practice” This study found that a lotion containing an alpha lipoic acid derivative increased hair diameter in chemotherapy patients with gastric or colorectal cancer, while those not using the lotion had more pronounced hair loss, suggesting potential benefits in managing chemotherapy-induced alopecia.
March 2025 in “Archives of Dermatological Research” This study found that combined microneedling with minoxidil significantly improved hair count and diameter in patients with androgenetic alopecia, although more mild adverse events were reported compared to minoxidil alone.
January 2025 in “International Journal of Medicine in Developing Countries” This systematic review found that combining fractional photothermolysis with topical minoxidil significantly increased hair diameter compared to minoxidil alone in androgenetic alopecia treatment.
This study found that Xiaochuang Drink significantly reduced the sebaceous gland and hair follicle diameter in a rabbit ear acne model and was determined to be safe at clinical doses.
December 2013 in “Journal of Pharmaceutical and Scientific Innovation” This study found that the Ayurvedic formulation Trichup Capsule significantly increased hair length and diameter in treated animals without signs of toxicity or mortality.
January 2011 in “Kufa Medical Journal” This study found that topical minoxidil solution significantly promoted hair growth and increased hair follicle diameter in mice, compared to untreated controls, without affecting hormone levels.
January 2010 in “Laboratory animal science” This study found that Heterogeneous Victoria A Acid Capsules significantly reduced sebaceous acid capsule diameter and hair follicle size in a rabbit model of micro-acne.
February 2003 in “Dermatology Times” According to this study, hair diameter diversity and peripilar signs can predict future hair loss in early-stage androgenic alopecia.
74 citations
,
July 1991 in “The Journal of Urology” This study found that topically applied minoxidil was more effective than nitroglycerin and placebo in enhancing penile diameter, rigidity, and arterial flow, with the most pronounced effects in patients with neurogenic impotence.
40 citations
,
March 2019 in “Pharmaceutical development and technology” The study found that cyproterone acetate-loaded nanostructured lipid carriers, particularly those with a 300 nm diameter, improved skin penetration and targeted hair follicles more effectively than free cyproterone acetate.
29 citations
,
April 2019 in “Lasers in Medical Science” This study found that combining fractional erbium-glass laser therapy with topical minoxidil significantly improved hair density and diameter in men with androgenetic alopecia compared to using minoxidil alone over a 24-week period, with no serious adverse events reported.
20 citations
,
May 2007 in “Asian-Australasian Journal of Animal Sciences” This study found that polymorphisms in the KAP8.2 gene in Chinese Inner Mongolia cashmere goats are associated with variations in cashmere fibre diameter, suggesting its potential as a molecular marker for this trait.
11 citations
,
December 2016 in “Frontiers in Psychology” In this study, researchers used computer-generated models to demonstrate that subtle changes in hair diameter, density, and style significantly affect perceptions of age, health, and attractiveness.
7 citations
,
March 2019 in “Dermatologic surgery” In this randomized trial, bimatoprost 0.01% significantly improved eyebrow hair density and diameter in patients with eyebrow hypotrichosis compared to a placebo, with minimal adverse effects, suggesting it is an effective and safe treatment option.
7 citations
,
August 1985 in “British journal of dermatology/British journal of dermatology, Supplement” This study found that subcutaneous injection of medroxyprogesterone acetate was more effective than intramuscular or topical treatments in reducing hair diameter for hirsute females.
6 citations
,
December 2018 in “International Journal of Cosmetic Science” In this study, hair samples from Mexican women were found to be intermediate in diameter and shape between Asian and Caucasian hair, exhibiting high intra- and inter-individual variability and unexpected levels of tensile damage.
5 citations
,
January 2021 in “Journal of Cosmetic Dermatology” This study found that adding platelet-rich plasma with microneedling to conventional medical treatment significantly increased hair density and diameter in androgenetic alopecia patients compared to medical treatment alone.
4 citations
,
July 2019 in “Journal of cosmetic dermatology” This clinical study reported that while both 0.01% and 0.03% bimatoprost significantly improved eyebrow density and diameter in patients with eyebrow hypotrichosis, the 0.03% concentration was more clinically preferred by patients.
2 citations
,
January 2014 in “Hair therapy & transplantation” This study found that combining oral chelated Zinc with 5% minoxidil solution improved hair density and hair shaft diameter in women with female pattern hair loss, without reported side effects.
2 citations
,
January 2012 in “Charles Sturt University Research Output (CRO)” This study found that during pregnancy, dairy cattle experienced an increase in body hair diameter and weight; however, after giving birth, the hair weight decreased.
1 citations
,
February 2025 in “International Journal of Molecular Sciences” This study found that supplementing Liaoning cashmere goats with HMBi increased cashmere length while decreasing its diameter, attributed to changes in Met-related metabolites and elevated expression of genes related to the Met cycle and cell differentiation pathways such as Wnt and MAPK.
1 citations
,
January 2013 in “Hair therapy & transplantation” This study reported that adding the topical product CG210 to oral finasteride 1mg significantly increased hair diameter more than finasteride alone in male androgenetic alopecia patients already stabilized on finasteride treatment.
June 2026 in “Journal of Sulaimani Medical College” This study found that adipose-derived stem cell exosome injections were more effective than minoxidil in improving hair density and diameter in patients with androgenetic alopecia, with high patient satisfaction and manageable side effects.