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Aging causes hair to gray and thin, with the timing of graying varying by race, and factors like oxidative stress and genetics can lead to hair loss.

The document explains hair growth, hair loss types, and other hair-related terms.

Hair transplantation effectively treated a bald patch in an 18-year-old woman with Temporal Triangular Alopecia.

This review discusses the various stem cell populations associated with hair follicles and their potential in regenerative medicine, highlighting differences between murine and human hair follicles but reports no new clinical results.

This study concluded that hair-derived stem cells from older donors may offer a promising alternative for autologous corneal endothelial replacement, potentially benefitting patients of various age groups.

This review summarizes fundamental concepts and recent advancements in hair follicle biology, including insights from mouse models into broader molecular and cellular processes relevant to regeneration and development.

This study found that Wnt signaling in the hair follicle is crucial for coordinating the behavior of epithelial and melanocyte stem cells, which drives hair regeneration and melanocyte differentiation in mice.

This review examines the differential aging of melanocytes in hair follicles and skin, and reports no new findings; the authors suggest further research is needed to understand these processes.

This study demonstrated that bioengineered hair follicles reconstituted from embryonic skin cells and transplanted into hosts can restore physiological hair functions, suggesting potential applications for treating alopecia.

This paper reviews hair structure and damage from grooming and cosmetic exposure but reports no new clinical findings; it suggests collaboration between dermatologists and cosmetic chemists to improve hair care products.

This study found that ionizing radiation primarily affects keratinocyte stem cells in the hair follicle, suggesting they play a central role in radiation-induced hair graying, rather than melanocyte stem cells.

This review discusses various aspects of hair color, including its formation and evolutionary variations, based on research presented at the 4th Intercontinental Meeting of Hair Research Societies 2004, without providing new experimental results.

This article discusses melanocyte development from neural crest cells and reports no new experimental results; the authors suggest a broader range of functions for melanocytes than previously recognized.

This review of murine studies reports that γ-rays affect hair follicle pigmentation in mice throughout the hair cycle, while effects on hair structure may be obscured by aging.

This study identified a small population of PAX3+/CD34+ cells in human foreskin tissue that may serve as transition cells between melanocyte stem cells and hair follicle stem cells, characterized by specific marker expressions.

This review explores the potential of herbal therapies and modern delivery methods for managing premature hair greying, highlighting promising plant-based treatments and emphasizing the need for clinical trials to validate their effectiveness.

In this case report, two young women with female pattern hair loss experienced significant hair regrowth without adverse effects after six months of treatment with bone-marrow-derived mesenchymal stem cells and their extracellular vesicles, suggesting potential for this approach when conventional treatments fail.

This review discusses recent advances in the understanding of follicular melanogenesis and its pathological changes, particularly how these changes are associated with specific disease phenotypes, but it reports no new results.

In this study, cross-sex hormone therapy affected hair growth patterns differently, with estrogen reducing hair growth in male-to-female transsexuals and testosterone increasing it in female-to-male transsexuals; however, male typical hair diameters were not fully reached in the latter group after 12 months.

This study suggests that the paradoxical effects of androgens on hair growth are due to differential gene expression in hair follicles, possibly established during embryogenesis.

Testosterone and dihydrotestosterone affect hair growth, and new techniques like the folliculogram help study it, but fully understanding hair growth is still complex.

This article provides a framework for understanding hair disorders and treatment options in transgender individuals undergoing hormonal therapy and reports no new clinical results.

This article reviews the cellular dynamics affecting dermal papilla size in androgenetic alopecia and suggests targeting DP size could improve therapies, but it presents no new clinical data.

This study found that body hair transplantation using follicular unit extraction was effective and resulted in high satisfaction among selected patients with limited scalp donor hair.

This study found no general elevation in androgen levels among men predisposed to balding, despite a correlation with the free-to-total testosterone ratio; no link was observed with acne.

FUE hair transplantation using a micromotor is effective and gives natural results with few complications.

This study observed that direct hair transplantation, as a modification of follicular unit extraction, was effective in improving baldness in the majority of treated male patients.

This review discusses recent developments in hair restoration, highlighting the continued prominence of follicular unit strip surgery and the growing literature on the relatively new technique of follicular unit extraction, without presenting new clinical results.

This review discusses the use of beard hair as a donor source for hair transplantation in hirsute patients and highlights the lack of extensive studies on its efficacy and safety in East Asian populations.

This study found that anagen hairs require less force to be extracted than telogen hairs in an in vitro pig skin model, indicating different anchorage mechanisms.