Buy vitamin K2: 200 µg MK-7 all-trans, pure or with D3

Exactly two claims are authorised: vitamin K contributes to normal blood clotting and to the maintenance of normal bones. Everything beyond that — blood vessels, heart, “calcium to the right place” — is not an authorised claim and therefore does not appear here. What the evidence actually supports on these points is in the magazine.

EFSA has not set a tolerable upper intake level for vitamin K, because no harmful effects are known from food or from supplements. The one exception is vitamin K antagonists: anyone taking such medicines needs medical advice before use.

MK-7 is menaquinone-7, the form of vitamin K2 with the longest half-life. “All-trans” denotes the spatial form of the molecule that the body uses; the cis fraction is inactive. A label that states the all-trans share therefore says more than the bare microgram figure.

K1 (phylloquinone) occurs above all in green leafy vegetables; K2 (menaquinones) is formed by bacteria, for instance in natto or cheese. The authorised claims apply to vitamin K as a whole. Differences in uptake and retention time are explained in the guide.

With vitamin K antagonists (Phenprocoumon, Warfarin) vitamin K is the direct counterpart — here consulting a doctor is mandatory. For the newer anticoagulants (such as Apixaban) this mechanism does not apply, but the question still belongs with the treating practice, not with a category page.

Anyone already taking vitamin D3, or wanting to dose it separately, goes for the pure K2 tablet. The combinations are for those who take both anyway and want just one tablet; vitamin D3 and K2 each carry their own authorised claims.