Futurebiotics Vitamin K2 + D3 supplies the perfect match. While the benefits of Vitamin D are well known, many don't realize that Vitamin D needs Vitamin K2 to maximize its benefits. This formula helps the proper absorption of calcium with D3, while providing the correct distribution to your bones where you need it most. Futurebiotics K2 + D3 are truly the perfect pair for healthy bone and heart support.