Scientific research on peppermint herbal tea demonstrates its effectiveness against irritable bowel syndrome, this presumption being provided by studies of intermediate level of evidence 1 .
Sources: PasseportSanté.net
1. Jellin J, Gregory P, al e. Pharmacist's Letter/Prescriber's Letter: Natural Medicines Comprehensive Database. 9th ed. Stockton, CA: Therapeutic Research Faculty; 2007 .