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This article discusses the challenges in hair follicle pigmentation research compared to epidermal melanocytes and highlights the limitations of relying on mouse models, but reports no new experimental findings.

This study suggests that chemical methods can reveal subtle differences in scalp hair color variability across populations and emphasizes the need for enhanced understanding of hair fiber curvature.

This study demonstrates that dermal white adipose tissue regulates human hair growth and pigmentation through hepatocyte growth factor secretion, highlighting potential therapeutic targets for hair-related disorders.

This study found that rice bran ash extract and orthosilicic acid both increased melanin synthesis and related protein expression in melanocytes, suggesting potential therapeutic use for melanin deficiency.

In this study, researchers identified exosomal miR-199a-3p as a key factor in the regulation of melanogenesis by dermal papilla cells, finding that it enhances melanocyte proliferation and melanin production, suggesting potential therapeutic targets for pigmentation disorders.

This review examined and discussed the role of dermis-derived factors in the regulation of melanogenesis, noting their significance in both normal and abnormal mammalian skin conditions, suggesting an underexplored area of study compared to dermal and epidermal influences.

In this study, rapamycin was found to increase hair follicle pigmentation and prolong anagen duration in cultured human scalp hair follicles, suggesting it could be explored as an anti-greying agent.

This study found that inhibiting mTORC1 activity with rapamycin significantly increased melanin production and extended hair growth phase in human hair follicles, suggesting potential for managing hair growth and pigmentation disorders.

This study found that dermal white adipose tissue surrounding human hair follicles enhances proliferation, pigmentation, and hair shaft elongation in an ex vivo setting.

This article reviews the role of melanins in determining human hair color and discusses the specialized regulation of hair melanocytes during growth, with no new findings reported.

This article explains the role of melanins in hair color, focusing on their production by melanocytes, but presents no new research findings.

VIP reduces hair pigmentation by decreasing melanin production.

This article reviews drug-induced pigmentation and reports no new clinical findings, highlighting difficulty in confirming drug associations due to factors like delayed onset and polypharmacy.

This article reviews the pathogenesis and treatment approaches for premature graying of hair, noting the unsatisfactory options currently available, and reports no new clinical findings.

This clinical study in healthy Indian adults found that a four-month application of an Ayurvedic leave-on treatment significantly increased natural black hair density, reduced grey hair count, and was well-tolerated without adverse effects, suggesting its efficacy and safety for treating premature hair greying.

This article discusses the role of neurohormones and neuropeptides in hair follicle pigmentation and outlines promising neuroendocrinological strategies to address greying and damage, but reports no new clinical results.

This article reviews the impact of H2O2-redox homeostasis on hair follicle pigmentation via tyrosinase and associated mechanisms, discussing primarily findings from murine models without providing new clinical results for humans.

This study demonstrated that the biomimetic peptide PTP20 may help preserve hair pigmentation and reduce greying by enhancing melanocyte function and increasing melanin production in human hair follicles.

The combination of a plant extract and a peptide can increase hair pigmentation and may reverse greying.

In this study, saponins from Korean red ginseng were found to protect against the harmful effects of airborne particulate matter on human skin cells by reducing oxidative stress, inflammation, leptin expression, and melanin production.

This study found that Sox2 and BMP signaling may be key regulators of pigmentation and melanocyte migration, as suggested by experiments in mice, human biopsies, and cell co-cultures.

In this study, T3 and T4 were found to directly influence human hair follicles in vitro, enhancing keratinocyte proliferation, prolonging the hair growth phase, and affecting pigmentation.

This study found that anagen-phase hair follicles in mice are particularly sensitive to damage by ruby laser pulses, resulting in alopecia without scarring, suggesting enhanced laser hair removal strategies.

This study suggests that chronic stress can lead to decreased skin pigmentation in mice by disrupting the skin's HPA axis, potentially making stress a risk factor for depigmentation.

In this study, modulating Tyrosinase expression altered mouse coat color by affecting melanosome accumulation, indicating that melanosome maturity plays a role in determining skin and hair color beyond total melanin content.

This research found that spontaneous and depilation-induced hair growth result in biologically distinct telogen phases in murine skin, with variations in thickness, pigment content, and hair follicle composition.

This review examines the evolution of human skin pigmentation and its genetic basis, suggesting that variations might be due to a few interacting gene pairs, and reports no new research findings.

This study analyzed gene expression changes during the autumn coat color change in mountain hares and found conserved gene regulation with snowshoe hares, highlighting its role in seasonal camouflage adaptation.

This case report describes three Iranian men with gradual reddish-brown pigmentation on their cheeks and preauricular areas since childhood, unresponsive to sunblocks and topical steroids.

This article reviews the specific cosmetology needs of black skin, highlighting related complications and the importance of cosmetovigilance, but reports no new clinical findings.