Peppermint Oil for Intestinal Motility

Typical dose

Recommended dose

180-225 mg enteric-coated twice daily

Expected timeframe

2-4 weeks

Protocol

form

Enteric-coated capsules. Peppermint oil is also used undiluted by endoscopists sprayed onto the bowel wall to relax spasm during colonoscopy, which illustrates the direction of its effect

duration

2-4 weeks

co factor

Swallow whole 30-60 minutes before meals. Evidence is mixed because the effect on motility is not simple. Peppermint oil is a smooth muscle relaxant - menthol blocks L-type calcium channels, reducing contractile activity - so it is antispasmodic, meaning it slows or dampens contraction rather than speeding transit. This helps in diarrhoea-predominant and pain-predominant irritable bowel syndrome, where excessive or uncoordinated contraction drives symptoms, and it reduces spasm during endoscopy and barium studies. In constipation-predominant patterns, relaxing smooth muscle is the opposite of what is needed, and peppermint oil may not help or may slightly worsen matters. It also relaxes the lower oesophageal sphincter and can delay gastric emptying.

titration

Up to three times daily, 540-675 mg/day

starting dose

180-200 mg enteric-coated peppermint oil twice daily before meals

What the studies say

Less likely to help if