Calcium compounds synthesized for commercial use such as calcium citrate, calcium citrate/malate, calcium aspartate, calcium orotate and other forms (apart from carbonate) found in supplements can be excellent sources of calcium. Indeed, some are, with absorption rates in the vicinity of 30%. At those levels, they favorably match milk and dairy products, which usually deliver around 32% of their calcium. The benefit of dairy foods is often lost, nevertheless. They bring with them an acidic metabolic load that can drain the body of calcium, reversing any benefit of calcium absorption from dairy foods.
But those synthesized calcium supplements still do not match the best food sources. Broccoli, bok choy, and kale, for example, have fractional calcium absorption of 51.3%, 52.7% and 58.8% respectively. We can expect similar bioavailability from the plant, hydrilla verticillata, the material that is Super Natural Calcium.
Super Natural Calcium