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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 study suggests that vitamin A may inhibit hair follicle stem cells during refractory telogen in a dose-dependent manner, based on retinyl ester levels and vitamin A metabolism protein localization in mice.

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 excess dietary vitamin A may arrest hair follicles in refractory telogen in mice, while adequate levels promote competent telogen, revealing dose-dependent effects on hair cycling.

The study concluded that a dietary vitamin A level of 10,000 IU/kg optimally supports growth performance, fur quality, and antioxidant function in growing Rex rabbits.

The study found that normalizing mineral ion levels in vitamin D receptor-ablated mice prevented hyperparathyroidism and bone disorders but did not address hair loss, indicating the VDR's role in hair growth.

In this study, perimenopausal women with initially high hair concentrations of calcium, magnesium, and silicon experienced a decrease in these elements after intermittent dietary supplementation with calcium, magnesium, silicon, and vitamin D.

This study found that normalizing mineral ion levels in vitamin D receptor-ablated mice prevented hyperparathyroidism, rickets, and osteomalacia, but alopecia persisted, indicating a separate role for the receptor in hair growth.

This study demonstrated that high doses of L-cystine and vitamin B6 effectively prevent doxorubicin-induced hair loss in mice.

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.

The authors of this study concluded that higher calcium levels in hair may indicate early metabolic changes leading to osteopenia or osteoporosis in menopausal women, even before detectable by standard DEXA imaging.

This study found that ultraviolet light-enhanced visualization can detect subtle skin changes linked to carotene and vitamin A deficiency, which improved with dietary correction in deficient individuals.

In this study, researchers observed that dietary vitamin D intake and light exposure play a crucial role in vitamin D metabolism in mice, suggesting similar importance for human health in maintaining optimal vitamin D levels.

Vitamin D is crucial for skin health and managing skin diseases.

This study found that female students experiencing diffuse hair fall had significantly lower Vitamin D3 levels compared to healthy controls.

In this study, Japanese patients with alopecia areata were found to have higher BMI and retinol intake, with retinol intake predicting severity of hair loss.

This article reviews dietary recommendations for managing polycystic ovary syndrome and provides evidence that diet changes can improve the androgen profile in affected women, but it reports no new clinical results.

This case report describes a 33-year-old woman whose symptoms improved significantly after vitamin D and zinc supplementation, highlighting the importance of diagnosing and managing deficiencies to enhance quality of life in young women.

This study observed that patients with post-COVID telogen effluvium had lower serum ferritin levels than controls, but the levels were not indicative of nonanemic iron deficiency.

This review highlights the critical importance of a balanced diet, with adequate proteins, vitamins, and minerals, to support skin health and potentially treat inflammatory skin conditions like psoriasis and atopic dermatitis, emphasizing the need for evidence-based dietary guidance.

In this case study, the authors reported a post-bariatric surgery patient who developed acne due to inappropriate vitamin supplementation, emphasizing the need for careful monitoring and education on vitamin use to prevent complications in such patients.

This study found that Japanese patients with alopecia areata had higher body mass index and retinol intake, with retinol intake being a predictor of hair loss severity.

This study observed that increasing dietary vitamin C in capybaras significantly improved their skin, coat, and weight, though other nutrients might also have contributed to their improved condition.

This study found that fitness coaches and registered dietitians/nutritionists were the primary sources of information for bodybuilders, who showed moderate nutrition knowledge, while gender, exercise history, and sessions impacted dietary supplement use, and reported adverse effects included skin rashes and increased liver enzymes.

This study found that combined dietary supplementation of sodium hyaluronate and eggshell membrane was associated with various improvements in skin and coat health markers in healthy Ragdoll cats.

In this systematic review, researchers linked higher vitamin D and iron levels to reduced alopecia, while increased alcoholic and sugary beverage intake was correlated with greater hair loss, highlighting the impact of diet on hair health.

This study observed that many individuals with alopecia areata seek or receive dietary and nutritional advice to manage their condition, often making changes such as taking supplements or adding specific foods, yet most reported no change in their disease status.

This review discusses the strengths and weaknesses of existing studies on complex dietary supplements for hair loss, emphasizing the need for valid measurement methods like TrichoScale® to quantify effectiveness; it reports no new results.

This study found that intestinal uptake of pantothenic acid in mice was not affected by dietary levels but may increase slightly in late-stage deficiency, though likely not significantly.

This article reviews the link between certain dietary supplements, such as vitamins B6/B12, iodine, whey, and muscle-building products, and acne, emphasizing the need for dermatologists to discuss supplement use with patients; it reports no new results.