What is a key role of Vitamin K in the body?

Vitamin K plays a crucial role in bone development primarily through its involvement in the synthesis of proteins that are necessary for bone mineralization. One of the key proteins, osteocalcin, requires vitamin K for its activation. Osteocalcin is produced by osteoblasts, the cells responsible for bone formation, and helps bind calcium to the bone matrix. Adequate levels of vitamin K are essential for maintaining strong bones and reducing the risk of fractures, particularly in older adults.

While it is true that vitamin K has various roles in the body, its most significant contribution is related to bone health. The other roles mentioned, such as vision support, hormone regulation, and skin health, are not primarily associated with vitamin K, making bone development the most accurate answer in this context.