The perfect pair: Vitamins K2 & D3 were simply meant to be together. Most people know the benefits of Vitamin D, but many don’t realize that Vitamin D needs Vitamin K2 to maximize its benefits. Strong bones: Vitamin K2D3 not only promotes the proper absorption of calcium with D3, but the correct distribution to your bones where you need it most. Superior quality vegetarian capsules: Laboratory tested, non-GMO, gluten free, & soy free. All Bronson products are tested in our state-of-the-art facility in New York.