TWINLAB Calcium Citrate is a a great tasting chewable calcium citrate wafer that also supplies highly-absorbable amounts of critical calcium co-factors magnesium and vitamin D. 4 wafers supply 1000 mg of elemental calcium. For best utilization and absorption, it's very important to take the 4 wafers spread out over the course of the day versus all at once. And as always is the case with calcium and most minerals, you should take Twinlab Calcium Citrate Wafers with some solid food.