You need to take it in conjunction with D3 for optimal results. We take them together everyday.
I take K2 and D3 every day. Have for three+ years. They work in conjunction. Takes calcium out of the places it should not be (arteries, brain, tooth tartar, kidneys, etc.) and puts it back where it belongs (into the bones and teeth). My dentist comments on cleanings on the absence of tartar build-up.