'Vitamin K was discovered in 1929 Germany by observing its coagulation factor for clotting. They called the newly discovered vitamin Koagulationsvitamin. That may be one of the most straightforward and clear vitamin functions in a label we’ll ever see. Obviously that’s where the K comes from.
Though using similar biochemical processes, K2 mostly activates proteins that regulate where calcium ends up in the body, which may be an even more important issue for heart health than has been publicized.'