I second adding K2 to Vit D3.

As an aside, I no longer take a calcium supplement. As my diet is high quality food anyway, and likely to get plenty of calcium . Over consumption of calcium supplements led to increased incidence of heart attacks in women. Recommended levels were reduced. So I figure a meat and veg diet supplies enough.

Also, becareful to not confuse K1 with K2. Just like B1 is not B12.