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Vitamin D Deficiency: The Silent Saboteur of Our Mental Health I'm hormone-dependent! Why are you shocked? So are you! We all need cholecalciferol. According to nutrition scientist Professor Dr. Nicolai Worm, the best time of day for vitamin D production is between 10 a.m. and 2 p.m. Just 15 minutes of sun exposure is enough – provided you haven't applied sunscreen beforehand. After all, even sunscreen with a sun protection factor of 10 reflects most of the sunlight, signific