Anyone who calls herbs hazardous is totally misinformed. Every year the American Association of Poison Control Centers (AAPCC) compiles statistics on accidental deaths from drugs, herbs, vitamins, and other supplements. The AAPCC’s most recent report (2008) records 1,756 accidental poisoning deaths. How many were attributable to medicinal herbs? Zero. In every accidental death caused by a pharmacological agent, the culprit was a pharmaceutical. And it’s been that way for many years. Herbs are safer than drugs.
Mint has been used for hundreds of years as a health remedy. Peppermint oil might help with irritable bowel syndrome -- a long-term condition that can cause cramps, bloating, gas, diarrhea, and constipation -- and it may be good for headaches as well. More studies are needed to see how much it helps and why. People use the leaf for other conditions, too, but there’s very little evidence it helps with any of them.