Available from Now Foods, 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 vitamins 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 K2 is a nutrient that further supports bone health through its participation in healthy bone calcification.