What is the function of Vitamin D in the body?

Vitamin D plays a crucial role in the body, particularly in calcium absorption. One of its primary functions is to facilitate the increased absorption of calcium from the gastrointestinal tract into the bloodstream. This process is essential for maintaining adequate levels of calcium in the body, which is vital for ensuring healthy bone formation and maintenance. Additionally, Vitamin D is important for regulating calcium and phosphorus balance, contributing to overall skeletal health.

While Vitamin D does have associations with various other functions in the body, including aspects of brain health, immune function, and muscle strength, its most established and critical role remains its involvement in calcium metabolism. Without sufficient Vitamin D, the body's ability to absorb calcium effectively diminishes, potentially leading to health issues such as osteoporosis or rickets. This underscores the significance of Vitamin D in supporting bone health through its role in aiding calcium absorption.