Nature's Way Calcium & Magnesium is formulated in a 2:1 Calcium to Magnesium ratio in a great tasting blueberry formula to help support the maintenance of bones and teeth. It also contains bone-friendly ingredients Collagen, Manganese, Boron and Vitamin D3. This formula contains no Vitamin K2 and won't interact with blood thinning medications.Dosage: Adults take 1 tablespoon (15 ml) once daily. Take a few hours before or after taking other medications or natural health products.Caution: Consult a health care practitioner prior to use if you have a liver disorder. May cause mild gastrointestinal disturbances. Keep out of reach of children.