Vitamin K is a group of several substances. They distinguish Vitamin K1 (phylloquinone) and Vitamin K2. Biological role of Vitamin K is associated with participation in fibrillation. It is essential for synthesis of plasmozyme active forms and other factors of blood fibrillation while treatment with antibiotic and medication effecting intestinal tract microflora… read more about this vitamin at EveBridge.com - Minerals and Vitamins.