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This study found that feeding mice high levels of dietary vitamin A increased WNT signaling, which activated hair follicle stem cells and may have accelerated alopecia areata progression.

This study suggests that dietary grape powder may reduce the severity of atopic dermatitis in a mouse model, highlighting its potential in both prevention and intervention settings.

This review explores the role of nutrition and probiotics in enhancing skin, hair, and nail health through gut microbiota, highlighting the potential of nutritional interventions for cosmetic benefits via the gut-skin axis.

This animal study found that high dietary vitamin A levels altered hair cycling by affecting WNT and BMP signaling pathways in mice, which could be reversed by reducing vitamin A intake.

This study found that selenium deficiency in mice accelerated age-related conditions and metabolic decline but unexpectedly promoted longevity, suggesting low selenium levels might separate healthspan and lifespan.

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 review explores the biology of wool follicles and suggests their potential use as research models in modern biology, but it reports no new findings.

This review discusses the complex interplay of factors controlling hair regeneration and highlights the potential for targeted clinical applications in various hair disorders, while reporting no new clinical results.

This review discusses the potential benefits of a nutraceutical with biooptimized botanical extracts for treating hair loss and reports no new clinical results; ongoing studies aim to validate its efficacy.

This study identified new dietary ligands for the human vitamin D receptor, including curcumin and gamma-tocotrienol, which may influence its biological functions.

This study found that both ethanol and aqueous extracts of Lepidium sativum seeds improved insulin signaling and reduced obesity-related metabolic changes in high-fat diet-fed rats, suggesting potential as a dietary supplement.

This study found that adding methionine to a low-protein diet improved wool production and feed efficiency in Angora rabbits by promoting hair follicle development through mechanisms involving IGF1, KAP, and versican signaling.

This review discusses the role of biotin in metabolism and its dietary requirements, but provides no new experimental findings.

This article reviews the role of IGF-1 in acne pathogenesis and discusses how diet and smoking may influence insulin/IGF-1 signaling, but reports no new clinical results.

This narrative review reported that a variety of lifestyle-based interventions, such as specific dietary changes and physical activity, along with adjunctive therapies, have potential benefits in managing metabolic and hormonal outcomes in women with PCOS, although the variable study quality suggests further research is needed.

This review discusses vitamin D and calcium signaling roles in epidermal stem cell processes essential for wound healing but reports no new experimental results, emphasizing their potential interdependent regulatory mechanisms.

This review discusses molecular signaling pathways and nutritional factors influencing feather growth and regeneration in poultry and offers no new results; the authors suggest these insights may guide strategies for producing superior plumage.

This study found that vitamin D supplementation in diets of Rex rabbits improved hair follicle development and fatty acid metabolism, with 1400–2100 IU/kg proving most effective for hair density and 2800 IU/kg increasing hair length.

This review explores current research on how dietary phytochemicals may help manage male androgen disorders by affecting hormone levels and endocrine function, highlighting their potential therapeutic roles and mechanisms in hormonal health, but does not report specific results.

This review highlights the potential of combining immune regulation, phototherapy, and dietary strategies for effective vitiligo treatment, but emphasizes that more research is needed.

This review discusses the benefits of β-sitosterol, a plant compound found in nuts and seeds, which may lower "bad" cholesterol and help prevent heart disease, cancer, and diabetes, but notes the lack of clinical studies on its safety and effectiveness in humans.

In this study on mice, elevated IGF-1 levels in the skin were linked to premature aging of hair follicles, but interventions like reducing IGF-1 or using senolytic treatments helped restore stem cell health and counteract aging effects.

This study observed that eliminating positional error in hair segment analysis can improve understanding of changes in isotopic composition, aiding the identification of pathological conditions and dietary patterns.

This study found that fatty acid desaturation regulated by SCD1 is crucial for hair growth by maintaining hair follicle stem cell niches, with its absence causing abnormal hair growth in mice.

This review explains that dysregulated sebum secretion and composition contribute to acne and impaired skin barriers while highlighting factors like diet and hormones affecting sebaceous activity, and identifies novel molecular targets and model systems for future therapeutic developments.

This study found that exogenous glutamic acid can promote hair growth and keratinocyte proliferation, suggesting a novel signalling pathway in the skin.

This study found that supplementing with 1.5% α-ketoglutaric acid significantly improved the performance, hair follicle density, and antioxidant capacity in Rex rabbits, potentially by enhancing the Wnt signaling pathway and reducing amino acid catabolism.

This study found that dietary pyridoxine increased hair follicle density in Rex rabbits by activating PI3K/Akt, Wnt, and Notch signaling pathways, which may promote hair growth and delay telogen onset.

This study, published in "Más Dermatol," explores how multiple factors contribute to hair loss, such as genetics, hormones, oxidative stress, microinflammation, and emotional stress, and highlights interventions targeting these causes to improve hair regrowth and quality of life.

This study found that retinoic acid and a retinol complex formulation showed different permeation and compound localization in a skin equivalent model, with unique lipid changes observed with only the retinol formulation.