Nature's Way Calcium & Magnesium Citrate 2:1 with Vitamin K2 and Collagen - Blueberry Flavour - Formulated in a 2:1 Ca/Mg ratio in a great tasting blueberry formula. This liquid form is a convenient alternative to tablets or capsules to help support the maintenance of bones and teeth. Nature's Way Calcium & Magnesium Citrate is pre-acidified for easier absorption and is phosphorus-free. Essential for the development and maintenance of healthy bones and teeth, everyone should be sure to maintain adequate levels of Calcium, especially women who are prone to osteoporosis. Calcium is also vital for proper muscle development and functionality, and helps blood clotting, lowers blood pressure and helps activate many enzymes.