Many people think of vitamin K as the vitamin that supports the normal and healthy ability of the blood to clot. But vitamin K also supports strong bones and healthy arteries.* Vitamin K “pairs up” with vitamin D in the body, much like magnesium pairs up with calcium. The result is that vitamin K and magnesium can both help keep calcium in the bones and out of the blood vessels and other soft tissues.* 3-K Complete includes the clinically studied forms of vitamin K1 and vitamin K2 (as MK-4 and MK-7). 3-K Complete contains significantly more MK-4 than most other multiple-K products on the market, while the MK-7 is MenaQ7® – used in the majority of MK-7 research.