Why is vitamin D important for body function?

Vitamin D plays a crucial role in maintaining the health of the skeletal system by promoting the absorption of calcium and phosphate in the intestines. This is vital because calcium is essential for various body functions, including building and maintaining strong bones and teeth. Without adequate levels of vitamin D, the body struggles to absorb the amount of calcium it needs, which can lead to weakened bones and conditions such as osteoporosis.

While vitamin D does have other roles in the body, such as influencing immune function and possibly affecting other processes like mood and cardiovascular health, its most well-documented and significant function relates to calcium absorption and overall bone health.