Vitamin D3 is a secosteroid hormone that plays a foundational role in human physiology, particularly during the rapid growth phase from birth to age five. Beyond its classical role in calcium homeostasis, contemporary research highlights its function as a potent immunomodulator and a factor in neurodevelopment. 1. Calcium Homeostasis and Skeletal Integrity The primary physiological role of vitamin D3 is the regulation of calcium and phosphorus absorption in the intestine....

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