Vitamin K2 is a fat-soluble vitamin that helps direct calcium where it belongs. It activates osteocalcin to lock calcium into bone and matrix Gla protein to keep calcium out of artery walls. The MK-7 form stays active in your body longer than vitamin K1 and absorbs more reliably.
Take K2 alongside a meal that includes fat so your body can use it. Many people pair it with vitamin D and calcium for bones. If you take blood thinners like warfarin, talk to your doctor first since vitamin K can interfere with those medications.