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This study found that horizontally bisected donor hairs can be used to create finer hairlines, with about 46-47% growth reported in transplanted hair shafts and bulbs.

This study found that the HairMax LaserComb® significantly increased hair density and was safe and well tolerated for treating androgenetic alopecia in men compared to a sham device.

This study observed that human hair follicles were able to regenerate fiber-forming structures after the bulb was amputated and transplanted onto athymic mice, suggesting a general regenerative capacity.

This study found that maternal sub-maintenance nutrition reduced the density and branching ratio of secondary wool follicles in Merino sheep fetuses and identified genes potentially involved in these processes.

This article outlines a method for achieving natural-looking hair direction and density in hair transplants using specific parting and incision techniques, without accelerating hair loss in the recipient area.

This pilot clinical trial suggests that platelet-rich plasma (PRP) treatment may increase hair density in patients with androgenetic alopecia, though outcomes varied between patients.

This review suggests that platelet-rich plasma may be effective in increasing hair density in patients with androgenetic alopecia, but more research is needed to determine the best treatment protocol.

This study found that topical melatonin solution was associated with positive effects on hair density and reduction in hair loss for androgenetic alopecia, with good tolerability reported in several clinical trials.

The researchers highlighted the nutritional benefits of kiwifruit, noting its high vitamin C content, dietary fiber, and potassium, as well as its wealth of phytochemicals and antioxidants, which may aid immune function, digestion, and potentially reduce chronic disease risk.

This study found that culturing fibroblasts on stiffer substrates mimicking fibrotic wounds led to an aligned EDA fibronectin matrix with thinner fibers and decreased YAP activity, suggesting disrupted signaling that might be restored to promote regenerative wound repair.

This study reported that using human follicle stem cells isolated from hair bulge areas increased hair density by about 29% over baseline in patients with androgenetic alopecia, with significant improvements observed 23 weeks after the last treatment.

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.

In this study, BPA rapidly increased dendritic spine and synapse densities in cultured rat hippocampal neurons, with involvement of estrogen receptors and ERK1/2 and p38 pathways, but disrupted dihydrotestosterone's effects on synaptic plasticity.

This study found that a 12-week supplementation with MePL, a solution of miliacin encapsulated within polar lipids, significantly reduced hair density in the telogen phase and improved scalp dryness and hair brightness in women with telogen effluvium.

This study found that cyclophosphamide treatment in cashmere goats significantly increased cashmere yield by inducing shedding without affecting fiber length, with a 20 mg/kg body weight dose being optimal for hair removal and regrowth.

This study found that intradermal administration of adipose-derived stem cell–conditioned medium significantly increased hair density and dermal thickness, suggesting potential regenerative effects on both hair follicles and the interfollicular scalp in patients with alopecia.

In this study, topical 2% minoxidil did not significantly improve hair density measures in men with male pattern baldness, although there was no deterioration, suggesting a potential prophylactic effect.

This study reported that a magneto-responsive transdermal microneedle system delivered Minoxidil effectively and significantly increased hair density by 800% in mice with androgenetic alopecia after 10 days.

This study reported that follicular unit extraction using nonhead hair sources like the chest or beard may successfully restore hair density and achieve aesthetically pleasing results in severely bald men with limited head donor hair.

This protocol outlines a study aiming to determine if combining 660 nm red laser photobiomodulation and microneedling increases hair density in female pattern hair loss, but it reports no results yet.

In this pilot study, baicalin-containing serum significantly decreased hair loss and increased hair growth after two months in participants with telogen effluvium, as subjective and objective assessments showed statistically significant improvements in hair thickness and density.

This study reports that a prototype device may accurately measure changes in hair quantity, diameter, and density in patients with balding by assessing the cross-sectional area of hair bundles.

This study observed that treating human hair with NaOH led to partially removed cuticles, resulting in better fiber cohesion and mechanical properties similar to wool, unlike bleach or formic acid treatments, which weakened the fibers.

In this study, bromocriptine's inhibition of prolactin promoted secondary follicle development during anagen in cashmere goats, likely via changes in specific gene expressions, despite not affecting fiber characteristics or primary follicle activity.

This study found that both human and rat dermal papilla spheroids can induce hair follicle neogenesis, but larger spheroids increase inductivity without significantly affecting hair fiber diameter.

This study observed that epidermal growth factor and fibroblast growth factor have distinct roles in sheep skin, with EGF involved in differentiation and FGF in bulb proliferation and fiber growth.

In this study, researchers found that a polyphenolic extract from Annurca apples, high in procyanidin B2, increased hair growth, density, and keratin content in healthy subjects after 2 months of use, and stimulated keratin biosynthesis in vitro.

This study explored gene expression in Changthangi goats and found that higher expression of keratin-related genes and specific signaling pathways may play a role in the development of Pashmina fiber.

In this study, the bending stiffness of human hair was linked to the varying proportions of para-like versus ortho-like cortical cells within the hair fiber.

This review found that hydrolyzed collagen supplementation, particularly marine collagen, improves skin hydration, elasticity, and density while strengthening hair and nails, especially when paired with vitamin C and trace elements; however, more studies are necessary to evaluate long-term efficacy across different sources and demographics.