Caltrate Minis 600+D3 Plus Minerals Calcium and Vitamin D Supplement Tablets contain a dual action formula of calcium with vitamin D for bone strength, plus collagen-supporting minerals (3) to help your bones stay flexible. (2) Each serving of two mini tablets contains 600 mg of calcium carbonate, a concentrated form of calcium, to support healthy bones and muscles. (2) In addition to calcium, these calcium and vitamin D supplements contain key essential minerals zinc, copper and manganese to help support collagen production to facilitate more resilient bones that help keep you moving and doing the things you enjoy.