The dynamic duo of Magnesium & Calcium in equal ratio 1:1 with Vitamins D3 & K2 to help support muscle & bone health. Magnesium and Calcium are known to work together in the body with magnesium controlling much of the activity of calcium. This is why Nature's Way has joined magnesium and calcium together as a dynamic duo in equal balance (one to one ratio). Nature's Way Magnesium + Calcium not only contains equal doses of Magnesium and Calcium, but is combined with vitamins D3 and K2 (menaquinone 7) to support calcium absorption and help calcium to be deposited in the bone matrix to help build bone density. 1 tablet per day supports: Strong Muscles and Bones Nervous system function Energy production Calcium absorption AUST L 297603 Nature's Way Magnesium + Calcium Tab X 150.