Spearmint Essential Oil, Constipation and the Digestive System

Price, Shirley & Price, Len.  Aromatherapy for Health Professionals, Fourth Edition. (2012). p. 266

Marjoram Essential Oil and the Digestive System

"Marjoram is an excellent toner for the digestive system and may be used to treat intestinal cramps, flatulence, diarrhea, indigestion and constipation."
Purchon, Nerys and Cantele, Lora. The Complete Aromatherapy and Essential Oils Handbook for Everyday Wellness. (2014).