Natural Factors Vitamin K2 - 100 mcg - Features vitamin K2 as menaquinone-7 (MK-7), an advanced, fat-soluble form of vitamin K that serves multiple functions in the body. Vitamin K2 plays a critical role in protecting the heart, as well as in building strong bones. As a director of calcium, vitamin K2 guides the mineral toward tissues where it is needed, such as bones, and away from tissues where it could have a negative effect, such as arteries. Only K2 in the form of MK-7 has been shown to offer 24-hour protection in a single daily dose. Most people will have difficulty meeting their daily requirement of vitamin K2 through diet alone. Natural Factors Vitamin K2 provides highly bioavailable MK-7, naturally derived from natto beans, making it easy to get more of this important nutrient.