Menaquinone-4, also known as MK-4, is a form of vitamin K2, which plays a crucial role in various bodily functions. It is essential for blood clotting and helps maintain bone health by regulating calcium levels in the bones and blood. Menaquinone-4 is found in certain foods, such as animal products and fermented foods, and can also be synthesized in the body from vitamin K1. Research suggests that MK-4 may have additional health benefits, including supporting cardiovascular health and reducing the risk of osteoporosis. It is often studied for its potential role in preventing certain diseases, making it an important nutrient for overall well-being.