The vitamin required for normal clotting is vitamin K. This is because clotting requires clotting factors, and vitamin K is required for the production of clotting factors II, VII, IX, and IX. The process of forming a blood clot: thrombin converts fibrinogen into fibrin, which is not soluble in plasma, and intertwines with each other to form a network of blood components, i.e., the formation of a blood clot. Fibrinogen into fibrin requires the participation of thrombin, and thrombin is a coagulation factor in accordance with a certain order of successive activation and generation. There are 14 main types of clotting factors, of which the generation of clotting factors II, VII, IX, IX requires the participation of vitamin K, so they are also known as vitamin K-dependent clotting factors. Patients with coagulation disorders should go to the hospital in time to find out the cause, and should not use medication on their own, but should standardize the treatment under the guidance of doctors.