According to a new study by Swiss scientists, taking calcium supplements doubles the risk of heart attacks.

Fox News reports that University of Zurich researchers found that people who tack calcium supplements are 86% more likely to have a heart attack than those who don't. The data was provided from 24,000 German men and women aged 35 to 64, over 11 years.

Researchers said the risk more than doubled for people taking only calcium supplements.

The somewhat controversial findings, published in the journal Heart, couldn't show cause and effect, but advised that the supplements should "be taken with caution."