represents the makers of dietary supplements was quick to fire back, issuing a statement that the study was biased and did not prove that supplements caused any harm. it's important to keep in mind that this is associative, not a cause and effect study. adding while it may make for interesting scientific water cooler discussion it does not warrant sweeping concerns for elderly women. >> today everybody wants to know what to do with supplements, pitch them or not? one doctor said over and over the benefits of a healthy diet have been proven. it is not as easy as a pill, but it is proven. sharyn alfonsi, abc news, new york. >> one exception, apparently, calcium supplements, doctors say can help bone density. there's one to hang on to. >> i think people get so frustrated to hear study after study. they find out years later that it's not healthy for you. it's strange. you know.