Dietary Supplement Vitamin K2 in its MK-4 form to support bone, heart, and blood vessel health. Vitamin K2 (as MK-4) exerts a more powerful influence on bone health than vitamin K1. K2 also supports heart and blood vessel health.* It comes in a metered bottle for ease of use. Vitamin K2 offers significant benefit for supporting bone health – more than vitamin K1. Although vitamin K2 offers well-recognized postmenopausal bone support, because it has no estrogenic effects it also provides support to other populations as well, including anorexics, dialysis patients, individuals with Parkinson's disease, those who have cirrhosis of the liver, individuals who have had a bone marrow transplant, those immobilized after a stroke, and individuals on chronic steroid therapy. Vitamin K2 also supports a healthy heart and blood vessels. Thorne's vitamin K2 supplies 1 mg of vitamin K2 per drop. Research shows that 15 mg three times daily can be safely used. The concentrated liquid and the bottle's metered dispenser make use easy and convenient.