This 3-in-1 supplement contains Bone-Active which is formulated to help maintain bone density and strength, supporting optimal bone health. No matter what your age, you need to care for your bones. Supporting bone health with high-quality Calcium, Magnesium and Vitamin D is simple with this all-in-one supplement. Each of these nutrients plays an essential role in maintaining bone health. Calcium and Magnesium are important for muscle contractions as well as bone health. Vitamin D contributes to immune system health. Calcium is the primary mineral responsible for strong bones and teeth, and Magnesium and Vitamin D are essential for calcium transport and absorption.