Vitamin K2 is a vitamin that is found in kale, broccoli, and other greens. Vitamin K is involved in healthy blood clotting. Nutricost includes 100mcg of Vitamin K2 to get that extra k2 you are wanting. 
Vitamin D3 is the vitamin of the sun. Your body produces it when exposed to sunlight. But sometimes we can't spend all day in the sun. That's where supplementation comes in. Nutricost has added 125mcg (5,000 IU) of Vitamin D3 to this softgel supplement.   Combining the Two
By combining Vitamin K2 and Vitamin D3 you can reap the benefits of both in one convenient capsule. This combination also assists in the activation of the Matrix GLA, A Protein That aids in preventing calcium buildup.