What vitamin is essential for the blood clotting process?

Vitamin K plays a crucial role in the blood clotting process by serving as a cofactor for the enzymes that facilitate the modification of certain proteins necessary for coagulation. These proteins include prothrombin and other clotting factors that are required for the formation of a stable blood clot. Without adequate Vitamin K, the liver cannot produce these essential proteins, which can lead to increased bleeding and difficulty in stopping blood loss when injuries occur.

The other vitamins listed do not have the same role in blood coagulation. Vitamin B12 is primarily involved in red blood cell formation and neurological function. Vitamin C is an antioxidant that helps in the synthesis of collagen and supports the immune system. Vitamin D is important for calcium metabolism and bone health, rather than directly influencing blood clotting. Therefore, the selectivity of Vitamin K in promoting effective coagulation underscores its essentiality in this physiological process.