calcium promotes healthy, strong bones and is helpful in muscle contractions and nerve impulses. calcium citrate is a highly absorbable form of this important mineral. the addition of vitamin d3 assists with the absorption of calcium while also supporting a healthy immune system. these statements have not been evaluated by the food and drug administration. this product is not intended to diagnose, treat, cure or prevent any disease. adequate calcium and vitamin d as part of a healthful diet, along with physical activity, may reduce the risk of osteoporosis in later life.