Advanced (Includes magnesium, manganese, copper and zinc). Bone strength & flexibility. Includes magnesium & zinc. Know Your Bones: Fact: Calcium and Vitamin D are not the only nutrients that support strong bones. Magnesium, zinc, copper, and manganese are also important bone fortifying nutrients that support healthy bones. Caltrate Plus Minerals is a dual benefit formula for bone strength & flexibility. Fact: 94% of Americans are not getting enough Vitamin D from food alone. Caltrate has the highest level of Vitamin D3 (Per tablet; among leading calcium supplement brands) to help maximize Calcium absorption, supporting healthy bones and muscles. Doctor recommended. Dual Benefits: Support bone flexibility. Maintain strong bones. 2 in 1 dual action! (1) Calcium, vitamin D3, and magnesium for bone health. (2) Zinc and other minerals (Refers to copper and manganese) to support collagen production for bone flexibility.