Get a double dose with this product, which contains double the strength of Vitamin K2 and delivers 100 mcg of the substance. Swanson's Ultra Natto K7 (MenaQ7™) is the most biologically active form of Vitamin K2. Menaquinone-7 is derived from 100% natural Japanese Natto (fermented soy product). It has been scientifically proven to help fight osteoporosis by transporting calcium from the arteries to where it is needed, namely the bones that need it. Vitamin K2 is made up of 13 natural substances called menaquinones, of which Menaquinone-7 is the most important. It has been scientifically proven to be beneficial for cardiovascular and bone health. Extensive studies conducted in the Netherlands have shown that Menaquinone-7 from Japanese Natto, found in this Swanson product, helps you get calcium from your arteries to your bones where it belongs. Swanson's Natto K7 truly "puts calcium in the right place".