Calcium Citrate: 265% greater absorption rate than other calcium salts. Unlike calcium carbonate, Calcium Citrate does not require extra stomach acid for absorption. Therefore, it can be taken at any time. It is also a better choice for older people. Our composition also contains Magnesium Hydroxide which helps in overcoming calcium induced constipation. The Cholecalciferol in our product promotes calcium absorption and Zinc Sulfate promotes growth and development, reproductive health and boosts immunity.