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This study found that applying a red clover-chamomile complex extract ampoule for 4 weeks significantly improved hair density and shaft thickness at the hairline in participants with self-perceived decreased density.

This exploratory pilot study reported that using a 2% Oleosome-FGF-2 fusion extract scalp serum twice daily for 84 days in women with telogen effluvium and brittle hair improved hair density, anagen/telogen ratio, hair shaft thickness, and scalp hydration compared to a placebo.

Traction alopecia reduces hair density and thickness; proper hair care can help prevent it.

This study used high-resolution imaging and genetic analysis to investigate hair density in the Dazu black goat, identifying key genes like GJA1 and GPRC5D involved in follicle development and maintenance, and highlighted their role in animal hair density regulation.

This study analyzed changes in hair diameter and density with age in Caucasian women, highlighting variations in perception of hair amount over time.

This study observed significant differences in hair care practices and biologic hair parameters between Caucasian and African American women, which may contribute to varying hair fragility and growth.

This study found that the parietal/occipital hair density ratio decreases significantly only when baldness is visibly present, making it no better than the Hamilton/Norwood scale for assessing baldness severity.

This study found that glycosaminoglycan levels were higher in the occipital area of the hair shaft compared to the parietal area, with children showing higher levels than adults.

This study found that trichoscopic measurements of hair density and diameter are useful for assessing the severity of female pattern hair loss and its progression.

This study observed that indigenous South Africans with natural afro-textured hair have lower hair densities, varying shaft diameters, and distinct follicular unit patterns compared to other racial groups, with significant gender differences in some parameters, highlighting the need for tailored reference values in clinical settings.

This study found that in vivo, a novel microneedle system for valproic acid delivery may improve hair regrowth efficacy by upregulating hair follicle development pathways more effectively than topical application.

This study observed that a wearable electric stimulation device significantly promoted hair regeneration in rats and mice, outperforming conventional pharmacological treatments and enhancing growth factor secretion.

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.

This study found that treatment with the polyphenolic compound TCQA activated β-catenin, promoting hair regrowth and the initiation of the anagen phase in mice and human dermal papilla cells.

This study found that a single intradermal injection of Hair Stimulating Complex significantly improved hair growth in men with androgenetic alopecia compared to placebo.

This study found that visual hair density is better correlated with hair count and shaft diameter, leading to the development of the Hair Diameter Index used in planning hair restoration procedures.

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.

In this study, oral administration of Crataegus pinnatifida extract was associated with hair growth promotion in mice by inducing anagen phase and enhancing cell signaling related to hair follicle development.

In this study, blue light therapy at a specific wavelength increased hair density and shaft width in 90% of patients with androgenetic alopecia after 10 weeks.

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.

This systematic review suggests that laser treatments, especially low-level laser therapy and excimer lasers, may be effective for hair regrowth, though further large-scale studies are needed for validation.

This study found that 5% azelaic acid solution and 2% minoxidil solution both significantly increased hair density and shaft diameter in women with FPHL, with no significant differences between them.

This study found that combining ablative fractional CO₂ laser therapy with hair growth factors significantly increased hair density in men with androgenetic alopecia compared to using growth factors alone.

This review discusses the management of hair loss in midlife women, focusing on female pattern hair loss, hair shaft alterations from hair care, and telogen effluvium, and reports no new research findings.

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%).

In this study, the HairLux fractional radiofrequency device was found to be effective and safe for stimulating hair growth in androgenetic alopecia, with patients experiencing increased hair density and thickness after ten treatments.

This study found that combining topical minoxidil with microneedling improved hair density more than either minoxidil alone or with spironolactone for women with mild-to-moderate female pattern hair loss.

This study reports that quantitative trichoscopy, while noninvasive and convenient, provides less accurate hair density data compared to invasive histopathologic examination, which was demonstrated in a sample of adult Chinese individuals without alopecia.

This study found that hair care products containing fermented papaya, fermented mangosteen, and caffeine significantly inhibited hair loss, increased hair density and thickness, and improved hair follicle structure in individuals with androgenic or diffuse alopecia over three months compared to placebo and caffeine controls.

This study found that trichoscopic quantitative parameters reliably indicate the severity of female pattern hair loss and complement the Sinclair scale by offering a more objective and reproducible grading system.