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This study found that specific SNPs in the sheep FAT1 gene are significantly associated with wool quality traits, suggesting potential markers for improving wool crimp, fibre length, and fibre diameter in breeding.

This study involving male patients with androgenic alopecia found that a higher baseline zinc plasma level, specifically above 10 µmol/L, may predict the success of treatment with 5% topical minoxidil, correlating with increased hair density and diameter in the parietal area.

This study found that using a high concentration of minoxidil with microneedling and carboxytherapy significantly increased hair growth in 9 adults with androgenetic alopecia, as measured by hair density and diameter improvements.

Among Merino × Southdown cross sheep, this study found that certain variants of the KRT81 gene were associated with differences in fleece weight, but not with staple length or fibre diameter traits.

This study found that GnRH-A treatment significantly reduced hirsuties scores in women with mild idiopathic hirsuties but did not affect hair growth rate or diameter.

This study identified three genes in the ovine KAP13 family on chromosome 1 and found that a specific allele of KRTAP13-2 is associated with improved wool fibre diameter uniformity in Chinese Tan sheep, suggesting its potential use as a marker for enhancing wool traits.

This study found that intradermal spermidine injections stimulated cell proliferation and increased fibre length growth rate in wool follicles of Merino lambs, without significantly affecting fibre diameter.

This study observed that Althaea officinalis gel increased fibroblast populations, hair follicles, and vessel diameter in rat wounds, suggesting it might aid wound healing, though further clinical studies are needed.

This study found that the cross-section trichometer (HairCheck device) can accurately and sensitively measure hair mass index changes, offering a convenient tool for assessing hair density and diameter in patients with alopecia.

In this study, the researchers found that an increased number of hairs less than 40 microns in diameter per cm² was associated with androgenic alopecia in both men and women.

In this study, nucleotide sequence variation in the KRTAP13-3 gene was associated with changes in heterotypic hair fibre diameter variation in Chinese Tan sheep.

This study observed that multimodal therapy, including platelet-rich plasma, minoxidil, finasteride, and lifestyle modifications, significantly improved hair diameter and density among individuals with androgenetic alopecia and other noncicatricial hair loss conditions, especially in less advanced cases, after at least 8 sessions.

In this randomized, double-blind, placebo-controlled trial, topical 3% minoxidil was found to significantly improve facial hair density and diameter, quality of life, and patient satisfaction in transgender men on stable gender-affirming hormone therapy, with minimal adverse events compared to placebo.

This study on albino mice found that hair tonic formulations using methanolic and ethanolic extracts of Beta vulgaris L. promoted hair growth, with the ethanolic extract showing greater effectiveness in terms of length and diameter, potentially due to antioxidant and anti-inflammatory effects.

This study applied a machine learning-based genomic analysis to identify genetic markers associated with wool traits in Central Anatolian Merino sheep, successfully highlighting loci relevant to fiber diameter, staple length, and greasy fleece yield, which could inform breeding programs to enhance wool quality and yield.

This study found that scalp cooling resulted in visible hair retention in 53% of breast cancer patients undergoing Epirubicin/Cyclophosphamide and Paclitaxel treatment, with factors like hair bulb diameter, shaft diameter, and anagen rate significantly predicting outcomes.

In this study, researchers observed that blue LED irradiation enhanced cosmetic permeation, increased diameter, and improved resistance of hair fiber in Caucasian and Asian ethnic groups, whereas African hair showed less change.

In this study, researchers reported that standardized rosemary and capsicum extracts significantly improved hair growth parameters such as follicle density, length, and diameter in rats with testosterone-induced alopecia, suggesting these extracts may aid in more effective natural treatments for androgenetic alopecia.

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.

This study found that a biocomposite microneedle system, which includes selenium nanozyme and hypoxic extracellular vesicles, enhanced hair density and follicle diameter in androgenetic alopecia mice by fighting inflammation, promoting blood vessel growth, reducing reactive oxygen species, and counteracting androgen effects.

This study explored the effects of TTFE on male androgenic alopecia, finding that topical application increased hair density, follicular diameter, and scalp hydration while reducing water loss and sebum production in a 12-week trial.

In this study, after long-term observation of human scalp hair follicles over 16 years, the researchers found that a topical 5% minoxidil solution could stimulate hair regrowth after a period of dormancy, though with reduced growth rates and hair diameter.

This systematic review and meta-analysis found that adding low-level laser therapy to minoxidil treatment for androgenic alopecia does not significantly enhance hair count or diameter compared to using minoxidil alone.

This study found that 10% Citrus aurantium peel oil significantly promoted hair growth in ICR mice by reducing the time needed for hair growth initiation and completion, and by increasing hair length, follicle diameter, and count, showing potential as a hair growth agent.

In this study of Zhexi Angora rabbits, researchers found that the fine-wool group exhibited lower fiber diameters and a higher hair follicle density than the coarse-wool group, and they identified key candidate genes potentially regulating wool quality through RNA-seq and genome resequencing techniques.

Researchers reviewed 13 clinical trials on non-prescription monotherapies like procyanidin and cetirizine for androgenetic alopecia, finding potential improvements in hair density and diameter, but emphasized the need for more robust trials to confirm efficacy and safety.

This systematic review found that light and laser therapies, including excimer and erbium-glass lasers, generally increase hair density and diameter in various types of alopecia, with particularly notable effects in androgenic alopecia but limited efficacy in telogen effluvium.

This study found that treating mice with naringenin, alone or combined with minoxidil, significantly increased hair growth and follicle diameter and quantity, likely due to its antioxidant and anti-inflammatory properties.

In this study, researchers used trichoscopy to establish standardized findings for normal hair and scalp characteristics in 360 healthy males, noting significant age-related differences in hair diameter variability and identifying potential pathological indicators like colored dots and scarring not present in healthy individuals.

This study found that trichoscopy is a valuable tool for diagnosing various hair disorders by identifying specific trichoscopic patterns, such as hair diameter diversity in androgenetic alopecia and exclamatory marks in alopecia areata.