Calcium supplements may cause constipation, kidney stones, increase heart disease risk, and more. Here's what experts say about the risks, and when supplements are actually necessary.

Calcium and phytates that are often in protein powder can block iron absorption, according to Theresa Gentile, MS, RDN, CDN, ...

It might seem convenient to take all of your vitamins at the same time, but experts say that habit could be limiting how well your supplements work. Some vitamins and minerals compete for absorption ...