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This brief article is a response from the authors about hair density, hair diameter, and female pattern hair loss, and it reports no new clinical findings.

This upcoming clinical trial at Shenzhen People's Hospital will explore the safety and efficacy of human umbilical cord mesenchymal stem cell-derived small extracellular vesicles as a treatment for androgenetic alopecia in young men, comparing them to minoxidil. Results are not reported yet.

In this study, researchers found that circulating exosomes from different sheep breeds can significantly alter hair growth in mice, with the source of exosomes influencing hair follicle size and hair diameter, as well as expression of specific hair growth and melanin synthesis markers.

In this study, researchers found that circulating exosomes isolated from the plasma of Xinji fine-wool and small-tailed Han sheep influenced hair growth characteristics in mice, altering follicle and hair shaft diameters, and affecting hair follicle development and melanin synthesis.

This study investigated the impact of circulating exosomes from Xinji fine-wool and small-tailed Han sheep on hair growth in mice, finding that these exosomes influenced hair follicle development and melanin synthesis, with differences noted in hair follicle and hair diameters between different exosome treatments.

This study found that videodermoscopy is a promising non-invasive tool for distinguishing between types of non-scarring alopecia on the scalp, highlighting its potential in dermatological practice.

This study found that a cholesterol-conjugated, cell-penetrating asiRNA targeting the androgen receptor effectively reduced hair loss and promoted hair growth in mouse models of androgenetic alopecia, suggesting potential as a novel treatment.

This study found that intradermal injection of a cell-penetrating, AR-targeting asiRNA promoted hair growth and reduced androgen receptor expression in mouse models of androgenetic alopecia, suggesting its therapeutic potential.

This study found that platelet-rich plasma injections increased hair diameter in the treated Pakistani population, with significant improvements observed in both men and women.

This article provides an overview of hair density, hair diameter, and the prevalence of female pattern hair loss but reports no new clinical findings.

This study found that hair diameter increases toward the scalp during pregnancy, a novel observation compared to the normal decrease seen in nonpregnant women.

In this study, microneedling followed by topical 2% chitosan significantly improved hair growth parameters in patients with androgenetic alopecia, comparable to results with 5% minoxidil, but a small sample size limits definitive conclusions on their relative efficacy.

This systematic review study found that platelet-rich plasma treatment may improve hair density and diameter in women with androgenetic alopecia, although the findings are limited by the small sample sizes and pilot nature of the included studies.

In this study, trichoscopic examination revealed that variations in hair diameter were more common in certain types of alopecia affecting the frontal scalp, suggesting the importance of evaluating the entire scalp for accurate diagnoses, although limitations include a single center design and small sample size.

Hair loss in women is genetic, diagnosed by examination and biopsy, and treated with minoxidil, finasteride, or transplantation.

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.

This study found that a new formulation kit of Pielus Anti-hair loss lotion and shampoo, used daily for 90 days, was safe and effective in reducing hair loss and increasing hair strength and density among patients with telogen effluvium and/or androgenetic alopecia.

This study found that oral spironolactone 100 mg daily for 24 weeks improved terminal hair counts and diameters in premenopausal women with female pattern hair loss when used alongside minoxidil, despite a higher incidence of menstrual irregularities.

In this study, female pattern hair loss in Chinese Han patients was characterized by decreased hair density and shaft diameter, with minor gender differences and the vertex most affected.

In this study, oral supplementation with NMN for 12 weeks in middle-aged Japanese women significantly increased hair growth density and diameter and improved subjective assessments of hair texture and quality of life, with no significant changes in hair hormone concentrations observed.

This article offers guidance for hair transplant surgeons on addressing old or poorly executed transplants, focusing on surgical precision and effective use of limited donor hair to enhance cosmetic outcomes.

This study found that in Chinese Alashan Left Banner White Cashmere goats, guard hair length was positively correlated with guard hair diameter and down fiber length, but not with body weight at first combing.

This study observed no significant improvement of mesotherapy over 5% topical minoxidil for male androgenic alopecia, despite a small increase in hair shaft diameter variation with mesotherapy.

This study found that a 16-week dermal application of rice bran extract significantly increased hair density and diameter in male androgenic alopecia patients without causing adverse reactions.

In this study, QR678® and QR678 Neo® injections significantly improved hair density and thickness in women with PCOS-related alopecia over eight sessions, with effects lasting over a year.

This study found that a combined treatment using autologous scalp‐derived micrografts and allogeneic dental pulp stem cell‐derived conditioned medium was well-tolerated and improved hair characteristics in 69.5% of patients with male androgenetic alopecia, particularly increasing hair diameter and hair number per follicular unit.

In this study, microarray and proteomic analyses indicated that genes involved in immune response, receptor binding, and growth factor activity might influence wool fibre diameter in sheep.

Among Super Merino and Small-Tailed Han sheep, this study identified differentially expressed long non-coding RNAs and mRNAs linked to hair follicle growth and fiber traits, suggesting their potential roles in regulating these important wool characteristics through RNA sequencing and gene enrichment analyses.

This study found that trichoscopy was useful in diagnosing different types of alopecia, with specific trichoscopic features aiding in the differential diagnosis.

This study found that repeated immunization against melatonin in Australian feral goats temporarily increased cashmere production and altered growth cycles, but these effects diminished after the first year.