Supports Bone Health Complete Bone Formula With Vitamin D-3 &Vitamin K-2 A Dietary Supplement Minerals Family Owned Since 1968 GMP Quality Assured Calcium and Magnesium are minerals that are known to be essential for bone health. Along with these two important minerals, Now Cal-Mag DK Caps provide Vitamin D and K. Vitamin D3, a fat soluble vitamin, has been shown to play a critical role in bone metabolism, as well as in the absorption of Calcium and Magnesium in the intestine. Vitamin K-2 is a nutrient that further supports bone health through its participation in healthy bone calcification.