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This study, conducted among 50 women with female-pattern hair loss, observed that 89% had deficient or insufficient vitamin D levels and also showed low ferritin levels, suggesting these deficiencies may contribute to hair loss.

This study found that redhaired individuals consistently had higher calcidiol levels compared to non-redhaired subjects, suggesting a physiological adaptation for vitamin D synthesis in low UV-B conditions.

This study found that redhaired individuals exhibit higher calcidiol levels compared to non-redhaired individuals, suggesting a possible evolutionary adaptation for vitamin D photosynthesis in low UV-B environments in Europe.

This case study describes a child with rickets and alopecia who responded to a small dose of 1-a-hydroxyvitamin D3, but her alopecia remained unchanged despite treatment.

In this study, researchers highlighted that in sarcoidosis, macrophages in granulomas can produce vitamin D, potentially leading to calcium imbalances, where vitamin D supplementation may cause hypercalcemia, necessitating careful laboratory assessment before supplementation.