Excessive bleeding from an injury may be due to lack of vitamin

Excessive bleeding from an injury may be due to a lack of vitamin K. Vitamin K plays a crucial role in the blood clotting process, also known as coagulation. When a blood vessel is injured, a series of chemical reactions occur, leading to the formation of a blood clot, which stops the bleeding. Vitamin K is required for the production of several of the proteins involved in this process. Without enough vitamin K, the blood may not be able to clot effectively, leading to excessive bleeding from even a minor injury. Vitamins A, B, and C are not directly involved in the blood clotting process, although they do play important roles in maintaining overall health. Therefore, the correct answer is vitamin K.