Although calcium plays at least some minor role in lowering blood pressure , the mechanisms involved appear complex and somewhat unclear. However, people with a history of kidney stones must talk with a doctor before supplementing calcium because such supplementation might actually increase the risk of forming stones for the small number of people who absorb too much calcium. Calcium also appears to partially bind some fats and cholesterol in the gastrointestinal tract. Perhaps as a result, some older research suggests that calcium supplementation may help lower cholesterol levels. In one preliminary study, high dietary calcium intake was associated with a decreased risk, while calcium supplementation was not.
Most dietary calcium comes from dairy products .
11 Other good sources include sardines, canned salmon, green leafy vegetables , and tofu . Choosing a form of calcium supplement can be confusing. While fewer pills of the calcium carbonate form are needed, this form doesn't absorb as well as some other forms of calcium. CCM is increasingly the form of calcium recommended by doctors. Only preliminary research exists regarding the amino acid chelates of calcium, and conclusions cannot be drawn at this time.