"There are no clear studies that show a link between different types of cancers and the use of antiperspirant," Janette Nesheiwat, MD, a family and emergency medicine physician in New York City, told POPSUGAR. "Antiperspirants do not cause cancer, and even mercury has been eliminated from many of these products, which were thought to be a culprit." Dr. Nesheiwat explained that the FDA places strict guidelines on over-the-counter products, and any possible cancer-causing carcinogens are only permitted in trace amounts. "It's the cumulative compound effect of using multiple products that have trace amounts of carcinogens which could lead to cancer," she said.