Hi, Calcimax 500 mg tablets offer high potency 500 mg elemental calcium along with essential co factors like vitamin D3, magnesium, zinc, copper, boron, selenium and lysine for utilization of bio absorbed calcium into the bones. Calcium is a mineral that is required for the formation of bones and maintaining them. It is required to prevent breakage of bones. Vitamin D3 is used to treat low calcium levels and high phosphate levels. It helps the body to absorb more calcium from food and other dietary supplements. Calcimax 500 mg are indicated for pregnancy and lactation, high risk pregnancies like pre-eclampsia, advanced age pregnancy and complicated pregnancy. It is also indicated in osteoporosis, osteopenia, arthritis and fractures. Calcical tablet contains calcitriol (Active form of vitamin D), calcium carbonate and elemental zinc which is almost similar to Calcimax 500 mg tablet. So you can take any of them according to your doctor s advice. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician,