To not here. Vitamin D should or even must be paired with K2. Vitamin D on its own goes to your blood and fatty cells. Pairing K2 with Vitamin D moves it to the bones and teeth. Essential it’s where it is putting the calcium in your body. So if you were to say prone to heart conditions or breathing Vitamin D alone can worsen those conditions. Matched with K2 alleviates this problem and puts the calcium where it belongs.