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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.

In this study, the authors found that applying hypobaric pressure to the skin significantly increases the transdermal permeation of large molecules by enhancing diffusion, despite the associated skin stretching and hair follicle enlargement not fully explaining this effect.

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 in the Thai population, hair density varies by scalp location and decreases with age, and that Asians generally have lower hair density compared to Caucasian and African populations.

This study observed that the biophysical properties of hair in Caucasian females with brown hair significantly change with age, and smoking or being overweight was linked to smaller hair cross-sectional areas.

This study reported that intradermal injections of stem cell exosomes appeared safe and significantly improved hair density and diameter in male androgenetic alopecia patients over 24 weeks, suggesting the therapy may be a promising new treatment option worthy of further investigation.

This study found that miniaturization of hair is present in some women with androgenetic alopecia, but diagnosis may also be based on differences in hair shaft diameter between scalp regions.

This study found that bleached hair showed optimal protein structural integrity and tensile strength at pH 5, with significant changes in cross-linking, water content, and diameter at more alkaline or acidic levels.

This review discusses guidelines for hair transplantation tailored to East Asian patients, focusing on hairline design, donor harvesting, and graft techniques, and reports no new clinical results.

This study reports that plasma rich in growth factors appeared to improve hair follicle regeneration and patient satisfaction in individuals with androgenetic alopecia, though further trials are needed.

This study observed that Koreans generally have lower hair density, larger diameter, and slower growth rate compared to Caucasians, providing useful baseline data for studying hair diseases and treatments.

This network meta-analysis found that for female pattern hair loss, microneedling combined with minoxidil ranked highest for hair density and patient satisfaction, while poly-L-lactic acid threads plus minoxidil led in hair diameter; however, the evidence is uncertain and lacks placebo-controlled trials.

This study found distinct sex-based differences in the microscopic characteristics of scalp hair among a Nigerian population, providing valuable forensic data specific to this group.

This article reviews the biological and physical principles of laser hair removal and reports that current laser systems do not consistently achieve permanent hair follicle destruction across treated areas.

This study proposes a new, objective method to classify human hair into eight categories based on specific shape measurements, rather than traditional ethnicity-based classifications.

This study found that thermal hair straightening in Asian women was associated with various signs of scalp and hair damage, including CCCA-like hair loss.

This meta-analysis found that the combination of topical minoxidil-finasteride was more effective than minoxidil alone in improving hair density, hair diameter, and global photographic assessment for male androgenetic alopecia, though larger standardized trials are needed to confirm long-term outcomes.

In this phase I/II clinical trial, placenta-derived mesenchymal stem cell exosome therapy significantly improved hair density and diameter, and reduced hair loss in patients with androgenetic alopecia, though further large-scale studies are needed to confirm these results and investigate the underlying molecular mechanisms.

In this study, low-level laser therapy showed no statistically significant improvements in hair growth measures, despite some patients experiencing increases in terminal hairs and shaft diameter.

This study found that ADMSC-enriched lipografts used in conjunction with Follicular Unit Extraction improved graft survival, reduced post-surgery edema, and increased patient satisfaction in alopecia treatment.

This study found that using a hair removal laser can effectively reduce hair thickness in the hairline of Asian women with thick donor hairs from previous hair transplants, improving hairline appearance with mild, transient side effects.

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 the black bean-licorice-biotae folium extract may improve hair diameter, scalp moisture, and sebum secretion, although its effect on hair density was not significant.

In this systematic review and meta‐analysis, botulinum toxin monotherapy was found to significantly increase hair density in patients with androgenetic alopecia, with optimal effects observed using a 100-unit dose every six months. These findings suggest potential efficacy but should be confirmed in larger, placebo-controlled trials.

This review highlights new treatment options for hair restoration, including platelet-rich plasma and stem cell therapy, which have shown efficacy in increasing hair count and density for androgenetic alopecia and alopecia areata, but presents no original clinical data.

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.

This randomized controlled trial found that consuming *Gynostemma pentaphyllum* extract significantly improved hair elasticity, density, and diameter over 24 weeks without severe adverse events, suggesting it as a safe functional food ingredient for hair health improvement.

This pilot study found that intradermal 10% glucose combined with non-cross-linked hyaluronic acid improved hair density and diameter more than hyaluronic acid alone in adults with androgenetic alopecia, with no serious adverse events.

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.

This study found that using Urtica cannabina extract shampoo led to increased levels of copper, zinc, and iodine in the scalp hair of Mongolian women, along with improvements in hair growth, diameter, and density compared to a regular shampoo.