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This study observed that injecting mice with α-MSH resulted in black hair regrowth in shaved and plucked areas, suggesting a potential link to the agent darkening hair in animals with a specific pituitary tumor.

Pilocarpin can cause hair regrowth and color change in some cases but not in others, and it may have side effects in animals.

This paper reviews the hair color changes associated with valproic acid treatment, noting only a few reported instances of bleaching or darkening, and reports no new findings.

This study found that hair coloring, waving, and ironing were associated with increased hair abnormalities compared to untreated hair in Iranian women.

This study suggests hair diameter may indicate protein status in children if the sampling location on the head is controlled, noting inconsistencies in past research.

Valproic acid can cause hair loss, but information on hair color change is not detailed.

In this study, researchers evaluated the stability and color changes of compounded minoxidil formulations used for alopecia, finding that while the formulations remained chemically and microbiologically stable for up to 380 days, significant color changes were observed, which likely do not affect the product's effectiveness.

This review examines systemic drugs that can cause changes in hair color and emphasizes the importance of reporting these adverse events, but it does not include new clinical outcomes.

This case study reports a man with rapid hair thinning, whitening, and sparse beard, linked to an increased proportion of hair follicles in catagen or telogen phase and peribulbar lymphocytic infiltrate.

This review discusses age-related and environmental factors affecting scalp hair changes in women, highlighting diagnostic complexities and ongoing research into targeted treatments, without reporting new clinical results.

This study found that exposure to chlorine significantly reduced tensile properties in human hair compared to normal, while dyeing only affected some properties but not all.

Chemical treatments damage hair more than UV exposure, making it thinner and less flexible.

This review discusses the development, regulation, and aging of the human hair follicle pigmentary system and suggests potential for reversing hair graying by manipulating follicle melanocytes in vitro, but reports no clinical results.

This study observed morphological changes in scalp hair follicles of humans deprived of protein for 15 days, which suggests potential use in diagnosing protein-calorie malnutrition.

This study in a Lithuanian veterinary clinic observed diverse histomorphological skin changes in alopecic dogs caused by various rare diseases, including hyperkeratinization and pigmentation disorders.

Patients often experience long-lasting changes to their hair after stem cell transplants.

In this study, seasonal hair loss was most pronounced in low-ranking male vervet monkeys, and changes in scrotal color and hyperpigmentation also correlated with hair loss, but underlying causes were not identified.

This review discusses skin disorders in women of color, highlighting unique presentations like dyschromias from acne, and underscores the need for more research on racial and ethnic differences; it reports no new clinical results.

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.

Caloric restriction improves skin and fur structure but can cause muscle loss and movement issues.

This study found that while many drugs are reported to cause hair color changes, substantial evidence supporting a true relationship exists mainly for chloroquine and certain cancer chemotherapeutic agents.

This review highlights the possibility of safely altering hair color through innovative cosmetics by targeting key biological processes in hair follicles, using insights from mammalian pigmentation studies and drug-induced hair color changes as potential pathways.

This article reports on a rare case of hair yellowing induced by topical minoxidil use and discusses drug-induced hair color changes.

This review discusses how changes in hair and skin may indicate underlying vitamin deficiencies and emphasizes the need to identify populations at risk for these deficiencies; it reports no new results.

This review discusses chemotherapy-induced hair loss, highlighting that topical minoxidil can lessen its severity or duration but not prevent it, and reports no new clinical results.

This study found that some white or grey hairs can naturally regain pigmentation, suggesting hair greying may be reversible in certain conditions linked to psychological stress.

A 73-year-old man's grey-white hair turned dark brown after eczema treatment.

This article reviews therapy-related hair disorders in oncology patients, detailing underlying mechanisms and potential management strategies, but reports no new clinical findings.

This paper demonstrates that scalp micropigmentation can effectively conceal scalp and hair deformities with high patient satisfaction, offering a non-surgical alternative cosmetic solution.

The document explains how hair is studied in forensics to identify its source and its role in criminal investigations.