PERENNIAL. Strong mint flavor. Peppermint has a long tradition of medicinal use, with archaeological evidence placing its use at least as far back as ten thousand years ago. Peppermint has a high menthol content. The menthol soothes the lining of the digestive tract and stimulates the production of bile, which is an essential digestive fluid. A hot cup of herbal tea is an excellent way to settle your stomach after a big meal.