Menaquinone, also known as Vitamin K2, is a form of vitamin K that plays a crucial role in blood clotting and bone health. It is produced by bacteria in the human gut and can also be found in certain foods, particularly fermented products like natto, as well as in animal products such as meat and dairy. Menaquinone exists in several forms, designated by numbers that indicate the length of their side chains, such as MK-4 and MK-7. Research suggests that Menaquinone may help reduce the risk of osteoporosis and cardiovascular diseases by improving calcium metabolism in the body.