What is the primary function of Vitamin K?

The primary function of Vitamin K is related to its critical role in protein coagulation. Vitamin K is essential for the synthesis of certain proteins, known as clotting factors, which are necessary for blood coagulation. This means that Vitamin K helps in the processes that prevent excessive bleeding by ensuring that blood can clot properly when injuries occur.

While Vitamin K does have some roles in bone health, and there are emerging studies regarding its relationship with immune function, these are not its primary functions. The role of Vitamin K in aiding vision is minimal and not well-documented. Thus, the significance of Vitamin K in promoting proper coagulation pathways in the body is the most well-established and recognized function, underscoring why this choice is the best response.