Which of the following is a function of Vitamin K?

Vitamin K plays a crucial role in the body, primarily recognized for its essential function in blood clotting. It is required for the synthesis of certain proteins, known as clotting factors, that are necessary for the blood coagulation process. Without adequate levels of Vitamin K, the blood clotting process can be impaired, leading to increased risk of excessive bleeding during injuries or surgeries.

While Vitamin K is also involved in bone health and may support cardiovascular health by preventing calcium deposition in arteries, its most significant and well-studied function remains its role in coagulation. This is distinct from the functions of other vitamins mentioned in the options, which focus on areas like immune system support, energy metabolism, and vitamin D absorption.