Introvit-K-200 WS is composed of vitamin K. Vitamin K is a cofactor in the post-ribosomal synthesis of clotting factors including factor II (prothrombin), VII (proconvertin), IX (plasma thromboplastin component) and X (Stuart factor), as well as of proteins C and S that are involved in the production and inhibition of thrombin. Vitamin K hypovitaminosis results in hypoprothrombinemia, which in turn leads to prolonged bleedings, large haematomata and the development of severe haemorrhagic anemia and haemolytic jaundice. Menadione (synthetic vitamin K3) is absorbed by diffusion in the distal portions of the small intestine and colon, and metabolized to the diol (hydroquinone) form and excreted as glucuronide and sulfate conjugates.