Bronson's K2 + D3 provides just the right amount of each essential vitamin to maximize their benefits to your bones and heart. No more, no less. Without D3, you may be missing out on benefits from the calcium in your diet. Most people start taking Vitamin D3 after they experience signs of deficiency. You may have heard that D3 shouldnt be taken alone- and its true! Let us explain. While Vitamin D ensures that calcium is absorbed, Vitamin K2 (specifically as MK-7, the most bioavailable form) directs it to areas of your body such as your bones, so it can be put to good use. Without K2, the calcium absorbed may be deposited in the arteries, where it can lead to calcification or other issues. Bottom line, Vitamins K2 & D3 are truly the perfect pair. If youre serious about supporting healthy bones, experience the benefits of Bronson's K2 + D3!