Calcium Carbonate vs Calcium Citrate: Which Form Is Best?
8/7/2021· Calcium Carbonate vs Calcium Citrate. Calcium supplements are generally made with one of two sources of elemental calcium: calcium carbonate or calcium citrate. There are several differences to note: 2. Calcium Carbonate. Contains the highest concentration of elemental calcium at 40% by weight. Tablets are often smaller and fewer are needed to