Peppermint Oil
130mg per servingThe most-studied natural antispasmodic for intestinal comfort, delivered via enteric coating.
Overview
What it is
Peppermint oil from Mentha x piperita is the most clinically validated natural treatment for intestinal spasms and IBS symptoms. Its primary bioactive compound, menthol (30–55% of the oil), is a potent smooth muscle relaxant. In Feast, peppermint oil is enteric-coated — meaning it passes through the stomach intact and only releases in the small intestine, where it targets the smooth muscle responsible for post-meal cramping.
Mechanism
How it works
Menthol blocks voltage-gated calcium channels on intestinal smooth muscle cells, preventing the calcium influx needed for muscle contraction. This produces direct, localized smooth muscle relaxation in the intestinal wall. The enteric coating is essential — without it, peppermint oil would relax the lower esophageal sphincter in the stomach, potentially causing heartburn. By releasing in the intestines, it delivers antispasmodic effects exactly where post-meal discomfort originates.
Why it helps
Key benefits
Relaxes intestinal smooth muscle via calcium channel blockade
Reduces post-meal cramping, spasms, and intestinal discomfort
Enteric-coated to prevent heartburn and target the intestines
Supported by the strongest clinical evidence of any natural antispasmodic
Evidence
The research
The impact of peppermint oil on the irritable bowel syndrome: a meta-analysis of the pooled clinical data
Alammar N, Wang L, Saberi B, et al. · BMC Complementary and Alternative Medicine (2019)
Meta-analysis of 12 RCTs (835 IBS patients) found enteric-coated peppermint oil produced a risk ratio of 2.39 (95% CI: 1.93–2.97) for global symptom improvement with zero heterogeneity (I² = 0%). Number needed to treat was 3. No significant difference in adverse events vs. placebo.
Efficacy of soluble fibre, antispasmodic drugs, and gut-brain neuromodulators in IBS: a systematic review and network meta-analysis
Black CJ, Yuan Y, Selinger CP, et al. · The Lancet Gastroenterology & Hepatology (2020)
In a network meta-analysis of 51 RCTs (4,644 IBS patients) comparing fiber, antispasmodics, peppermint oil, and neuromodulators, peppermint oil ranked first for efficacy in global IBS symptom improvement.
Peppermint oil for the treatment of irritable bowel syndrome: a systematic review and meta-analysis
Khanna R, MacDonald JK, Levesque BG. · Journal of Clinical Gastroenterology (2014)
Systematic review and meta-analysis of 9 RCTs (726 IBS patients) confirmed peppermint oil is superior to placebo for both global symptom improvement and abdominal pain reduction, establishing it as a safe and effective short-term IBS treatment.
Dosage
130mg per serving
Why this dose
Meta-analyses of enteric-coated peppermint oil RCTs used doses of 90–225mg per dose. The 130mg dose in Feast falls in the middle of this range, matching the dose used in multiple pivotal trials. At 130mg, peppermint oil delivers approximately 50–70mg of menthol — within the therapeutic window for intestinal smooth muscle relaxation.
Safety & tolerability
Enteric coating is essential — uncoated peppermint oil can relax the lower esophageal sphincter and cause heartburn. Those with GERD should use enteric-coated formulations only. Peppermint oil may interact with certain medications metabolized by CYP3A4.
The formula
Why it matters
Intestinal spasms are one of the primary causes of post-meal discomfort, especially after rich or heavy meals. Unlike pharmaceutical antispasmodics, enteric-coated peppermint oil acts locally in the intestines without systemic side effects. Its clinical evidence base is among the strongest of any natural digestive ingredient — with meta-analyses confirming it is 2.39x more likely to produce global symptom improvement compared to placebo.
Works with
Spearmint Oil
Peppermint (menthol) and spearmint (carvone) relax intestinal smooth muscle through complementary mechanisms for broader antispasmodic coverage.
Ginger Oil
Peppermint targets the intestines via enteric coating while ginger oil releases in the stomach — together they provide antispasmodic support through the full GI tract.