Most people already know the main benefits of Vitamin D: strong bones and teeth healthy muscle function and immune support. But many don?t know that Vitamin D-3 needs Vitamin K-2 to work at its best. That?s why our powerful formula combines 5000IU (125 mcg) of D-3 from cholecalciferol with 500 mcg of K-2 from menatetrenone MK-4. While Vitamin D-3 helps the bones absorb calcium K-2 may help direct the calcium to the bones and away from arteries and joints. The same biologically active form of Vitamin D synthesized through sun exposure Vitamin D-3 may also help support proper immune system function and a healthy heart. Convenient and easy to use our liquid dropper lets you easily add Vitamin D3 and K2 to your daily diet. Plus the great natural citrus flavor makes supplementation a treat! Like all KAL products D3 K2 DropIns is lab verified for the purity and potency of its ingredients. Confidence in the KAL name is just one of the reasons we?ve been around so long and maintain our place as a leader