The K vitamins are involved in the formation of various protein building blocks. For example, they are involved in the production of blood coagulation proteins and are important for proteins of the blood plasma, kidneys and bones. This also explains the influence of vitamin K on osteoporosis. Studies have shown that women with low vitamin K intake also have a higher risk of fractures. However, it remains to be seen what role the vitamin compounds actually play in the development of the disease and whether an additional intake of vitamin K is beneficial. Another topic under discussion is the influence of vitamin K on the protection of cardiovascular diseases.