Vitamin D3 is an important vitamin for the health of your thyroid, bones and teeth, the absorption of calcium and phosphorous, and the prevention and treatment of breast and colon cancer, osteoarthritis, osteoporosis, and hypocalcemia.  

The majority of Americans are deficient in Vitamin D3.  Vitamin K2 is included in this formula because it plays an important role in creating proteins in the bone on which calcium crystallizes.  Vitamin K2 also helps to prevent certain cancers and increase longevity.