Vitamin K completes the group of fat-soluble vitamins. This vitamin is known for its role in normal blood clotting. Vitamin K exists in three forms: phylloquinone (K1) from leafy greens, menaquinone (K2) from intestinal bacteria and menadione (K3) which is a synthetic compound. In addition to its contribution to blood clotting, vitamin K plays a role in the maintenance of normal bone structure. The reference intake is 75µg per day. However, people taking coumarin anticoagulants should not exceed an intake of 25µg per day.

Fisher uses vitamin K in its natural form and more specifically in the form of menaquinone (K2). K2 has a higher bioavailability than K1, which means that it is more easily absorbed by the body and its effectiveness is enhanced.

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