Maybe you have read about a study claiming that calcium by itself taken as a supplement is associated with an increase risk of myocardial infarction (Bolland MJ, et al. 2010).
This study has been criticized as being highly inaccurate. The study was a so called meta-analysis where the researchers picked earlier published studies which the participants had been taking calcium supplements by itself. The way the studies were picked is one of the factors being criticized. Other criticisms were that the studies picked were not designed to evaluate cardiovascular risk, data on cardiovascular death was collected separately at a later time and several other issues. The researchers also eliminated studies where calcium was used together with vitamin D because those studies showed a decreased cardiovascular risk.
Another study also published recently investigated both calcium and vitamin D as it related to cardiovascular risk (Wang L, et al. 2010). These researchers concluded that vitamin D supplements of moderate to high doses may reduce cardiovascular disease risk, whereas calcium supplements seemed to have minimal cardiovascular effects.
Calcium is an important mineral with proven health benefits, but it is better to take calcium together with other minerals and with vitamin D.
To read more about these benefits, click here.