It's a traditional folk remedy for ulcers, and there's some evidence that it's effective. Licorice contains glycyrrhizic acid, a compound that is thought to strengthen the intestinal lining and help ulcers heal more quickly, says Dr. Miner.
The problem with licorice is that long-term daily use can cause high blood pressure. Also, read the label on the package: Most "licorice" in the United States is actually made with licorice flavoring, which won't have the same effects as the real thing. The average daily dose is 1.5 to 3 grams, says Dr. Meyers, but talk to your doctor before taking this amount, because the risk of high blood pressure is high. Licorice should not be used on a regular basis for a prolonged time—no more than for 4 to 6 weeks.