Can You Be Too Careful?
Saccharin is a slightly different story. Extensive tests have proven that high doses cause bladder cancer in rats, but the National Cancer Institute has determined that people who ingest saccharin show no greater risk of cancer than those who abstain from the stuff. But, Pauli adds, "It's a lot easier to do rigorous tests on rats than it is on people."
Bottom line: If terms like "unlikely" and "not a strong risk" don't soothe you, stay away from saccharin.