* Extra Vitamin D3 to Help Optimize Calcium Absorption * Promotes Bone Health * Compare and Save * Dietary Supplement * Guaranteed Quality Laboratory Tested * Healthy You, Healthy Earth Calcium is the primary mineral responsible for strong bones. The body also uses Calcium for proper muscle contraction and nerve function. Vitamin D3 assists in Calcium absorption and maintaining a healthy immune system. Regular exercise and a healthy diet with enough calcium helps maintain good bone health and may reduce the risk of osteoporosis later in life.