Peppermint Oil

How it works: Relaxes smooth muscle.

Which symptoms does it help: Overall IBS symptoms, belly pain, bloating.

How long it takes to see a benefit: Within 24 hours.

FDA approved: N/A.

Dosage: Depends on the preparation.

Special considerations or risks: There are many peppermint oil preparations available; enteric coating may reduce side effects

Most common side effects: Allergic reactions are rare. Heartburn and anal burning can occur depending on the preparation.

Recommendation: ACG suggests peppermint oil for overall symptom improvement in IBS patients.