The scienfitic name for Vitamin K2 is „menachinone“. K2 is a fat-soluble vitamin. K Vitamins in general are necessary for blood clotting. Cabbage, spinach and salad contain these vitamins. They belong to the fat-soluble vitamins. It is formed from vitamin K1, which is a component of the photosynthesis apparatus of plants. Furthermore, K vitamins are a co-factor for bone metabolism. They activate proteins in different organs such as the liver, bones and arteries.