Some of the top-rated brands of calcium supplements, as of 2015, are Bluebonnet Calcium Citrate Magnesium and Vitamin D-3, Solgar Calcium Magnesium with Vitamin D-3 and Rainbow Light Calcium Citrate Mini-Tablets, reports LabDoor. Labs measure these supplements for label accuracy, product purity, nutritional value, ingredient safety and projected efficacy.
Bluebonnet Calcium Citrate Magnesium and Vitamin D-3 meets purity standards and contains 1010 milligrams of calcium in every serving, notes LabDoor. It contains 780 international units of vitamin D, which is a little less than it claims to have on its label. Solgar Calcium Magnesium with Vitamin D-3 contains 1,000 milligrams of calcium, which is 100 percent of the recommended daily value, and 400 International Units of vitamin D-3, explains Solgar.
Calcium supplements affect people in different ways and can cause discomfort. Doctors recommend a calcium citrate supplement for people who cannot produce enough stomach acid because it dissolves better than calcium carbonate, according to WebMD. People who suffer from conditions such as osteoporosis, lactose intolerance or celiac disease may require a calcium supplement to meet daily calcium requirements. The recommended dietary allowance for calcium in adult men and women is 1,000 milligrams and increases to 1,200 milligrams for women over 50 and men over 70, states Mayo Clinic.