Puritan's Pride offers a high quality Calcium / Magnesium / Zinc supplement that delivers 1000 mg Calcium, 400 mg Magnesium and 25 mg Zinc in one chelated form for optimal absorption. Calcium is the primary mineral responsible for strong bones.** Magnesium plays a role in proper bone mineralization, muscle contractions and nerve impulses.** Zinc helps support immune function and plays a role in over 300 enzymes in the body.** Adults can take one to three tablets daily with a meal (2 Bottle)