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This review discusses the potential role of nutraceuticals in preventing and treating COVID-19 and post-COVID syndrome, but reports no new clinical findings; the authors highlight the need for further research.

This article replies to a critical appraisal of a randomized trial on melatonin in alopecia and reports no new clinical findings.

In this study, oral zinc sulphate was found to cause hair hypopigmentation and significantly inhibit eumelanogenesis in mice.

This study found that melatonin exposure promoted hair follicle fiber growth in Cashmere goat cultures, potentially influencing pathways related to the microvascular system and extracellular matrix.

This study found that a dietary supplement containing L-cystine, medicinal yeast, and pantothenic acid significantly improved hair growth in women with telogen effluvium over six months compared to placebo.

This abstract describes the role of melanin in determining hair color and protecting against UV radiation, highlighting how its production affects hair health, growth, and vitality, with reduced production contributing to greying with age.

This review examines melatonin's role in managing PCOS and its potential to improve hormonal balance, oxidative stress, sleep quality, and mood, but reports no new clinical results.

This study found that melatonin significantly improved metabolic and reproductive parameters in PCOS-induced rats, with effects similar to metformin.

This study found that melatonin treatment in adult cashmere goats increased cashmere yield and improved fibre quality without negatively affecting the hair follicle development or cashmere production in their offspring.

This chapter reviews existing knowledge about melatonin's MT₁ and MT₂ receptors in human tissues, discussing their established and potential functions, but reports no new clinical findings.

This study identified key genes and signaling pathways involved in cashmere goat hair follicle growth cycles, influenced by melatonin implantation, suggesting a basis for further research on melatonin's regulatory mechanism.

This study investigated the impact of prolactin and melatonin on secondary hair follicle growth patterns in Angora and Cashmere goats using in vitro methods, without reporting new definitive results.

This study suggests that melatonin plays a role in hair follicle function by modulating growth and pigmentation, and it may act as a protective agent in active hair growth phases.

This review discusses melatonin's potential in dermatology, highlighting its antioxidative, immunomodulatory, and DNA repair properties, but reports no new clinical results.

This study found that melatonin combined with bromocryptine treatment in Spanish goats increased secondary hair follicle numbers and extended the cashmere growth phase during spring.

This article discusses the potential role of melatonin in protecting skin against stress and maintaining homeostasis, based on its local synthesis and various protective functions, but presents no new clinical results.

This study found that 62% of neutered dogs with hair cycle arrest experienced partial to complete hair re-growth after melatonin treatment, but hair re-growth was not consistently linked to normal sex hormone levels.

This study found that temperature affects the influence of daylength on prolactin secretion and hair growth in dairy goats, without significant involvement of melatonin.

The study found that melatonin treatment in early postnatal cashmere goats increased both the quantity and quality of cashmere by promoting secondary hair follicle development and enhancing antioxidant enzyme activities.

This review summarizes the promising role of melatonin combined with nanosized carriers in drug delivery, suggesting enhanced effectiveness in treating various diseases compared to free melatonin.

This study found that melatonin implants advanced the timing of the spring moult and increased hair follicle activity in adult cashmere goats, but had no significant effects on juvenile goats.

The researchers observed that normal murine hair follicles are direct targets for melatonin, with receptor expression varying throughout the hair cycle, suggesting melatonin's role in hair cycle control.

This study found that melatonin treatment improved cashmere production for one cycle in cashmere goats, enhancing fiber quality and follicle activity, but had no effects in the subsequent cycle.

This study found that gene expression patterns can effectively distinguish the cashmere growth cycle stages and highlight molecular pathways, suggesting melatonin's role in regulating cashmere growth in Inner Mongolian goats.

This study reports that melatonin influences gene expression related to cashmere growth cycles in Inner Mongolian cashmere goats, potentially aiding in understanding and enhancing cashmere yield through molecular regulation.

The authors observed that the patterned melanoderma on the hairless scalp of fair-skinned Caucasian men with androgenic alopecia resembled similar patterns seen on facial skin.

This study found that carvone, a plant-derived compound, decreases melanin content and inhibits melanoma cell proliferation through the cAMP pathway, suggesting potential benefits for treating melanomas and other hyperpigmentation disorders.

In this study, Epimedii Folium extract was found to enhance melanin production and promote pigmentation through mechanisms involving the MAPK/ERK1/2 pathway in both in vitro and in vivo models.

This review underscores the importance of phytotherapeutic compounds and adjuncts in managing polycystic ovarian syndrome but does not present new clinical evidence.

This study found that dietary supplementation with collagen, chondroitin sulfate, low-molecular weight hyaluronic acid, Pycnogenol®, and coenzyme Q10 significantly improved skin hydration, elasticity, nail hardness, and hair condition in patients with age-related dermatological changes after 12 weeks.