Introducing the perfect cardio-supporting pair: Vitamin K2 with Nattokinase. Numerous studies have suggested that menaquinone-7 (vitamin K2) supports cardiovascular wellness by producing proteins that promote healthy calcium absorption. Once called "stringy soybeans," the traditional Japanese food natto is a source of vitamin K2 that also features a unique enzyme called nattokinase, which breaks down fibrin to support healthy circulation. These softgels deliver both natto-derived nutrients for convenient supplementation.