Sona Peppermint Oil Enteric Coated (30). Sona Enteric Coated pure Peppermint Oil capsules provide symptomatic relief of discomfort caused by irritable bowel syndrome and is a natural digestive aid.. The Special Enteric Coating renders the capsules gastric resistant and helps deliver the oil intact into the intestines thus preventing the heartburn often caused by ingesting Peppermint Oil.