Vitamin D has really come to the fore as a must have daily supplement, particularly since it was established as one of the most important micronutrients there is, when it comes to the immune system. It is now one of the most extensively researched vitamins, and for good reason. Vitamin K1 should be mainly consumed via the diet from leafy greens and various other vegetables, but vast amounts of the public dont consume enough of these food groups to meet their K1 requirements, and even if they do, the K1 in leafy greens isnt at all well absorbed by the body (top tip: microwave your greens to optimise absorption).