Phytomenadione (vitamin K) is needed for the formation of blood clotting factors in the liver such as factor II (prothrombin), VII, IX and X. Phytomenadione (vitamin K) acts as a coenzyme in carboxylation of side chains containing glutamic acid. The resulting Ɣ-carboxy glutamyl compound converts the precursor into an active clotting factor which is then released by the liver cells into the blood.
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