Very promising wonderful composition - calcium in combination with vitamin D and magnesium - for the best assimilation, good dosage with vegetable enzymes that improve digestion. Unfortunately, I became very flaky and break nails, and these vitamins did not influence the situation. I took 4 tablets at day in two divided doses, with food. The tablets are very large and difficult to swallow, although I have never had this problem-but they really stick in and they need to drink one and plenty of water.