ENGLAND

A mint tea or an after-dinner mint does little for a cramping, irritable gut.
But enteric-coated peppermint oil is a genuine, evidence-backed treatment for it.

Peppermint oil  ·  Mentha × piperita  ·  Mechanism: menthol (antispasmodic)

Peppermint is not an ancient wild herb but something of a happy accident, a natural hybrid of watermint and spearmint that first arose by chance in England in the seventeenth century. The town of Mitcham, near London, became so famous for growing it that Mitcham peppermint was once a byword for the very finest peppermint oil in the world.

As a flavor it is now absolutely everywhere, in tea, toothpaste, sweets, chewing gum, and the little mint handed round after dinner. As a folk remedy it was always reached for the same way, to settle a churning, uneasy, upset, and unhappy stomach, and that old instinct, it turns out, was pointing at something quite real after all.

The trouble is that the everyday forms are far too weak to actually do the job. A cup of peppermint tea carries only a faint, dilute trace of the active oil, and an after-dinner mint is essentially just sweet flavoring, so neither one truly touches a genuinely troubled gut.

The medicine is the concentrated oil itself, and specifically how it is packaged for delivery to the gut. One clever little packaging detail turns a pleasant flavor into a genuine, effective treatment.

The active ingredient is menthol, and it works essentially by relaxing the gut's smooth muscle. Menthol blocks the calcium channels that make the gut wall contract, calming the painful spasms and cramping that drive so much of the pain of irritable bowel syndrome, and easing the trapped, uncomfortable gas along with them.

The clever, decisive little detail is the enteric coating on the capsule. Swallowed as a plain oil, peppermint releases up in the stomach, where it does little good and tends to cause heartburn, but sealed inside an enteric-coated capsule it survives the stomach and opens up lower down, delivering the menthol exactly where the spasms actually happen in the intestine.

The tea is a flavor. The enteric-coated capsule is the medicine.

On that footing, enteric-coated peppermint oil has strong, guideline-backed evidence for easing the symptoms of irritable bowel, better than almost any other natural remedy for the condition. It is not a cure and can cause heartburn if it releases too early, so it suits cramping and spasm best of all, and any new or alarming bowel changes, bleeding, weight loss, or a first onset later in life, need a doctor and a proper diagnosis before you reach for it at all.

The how-to

For IBS cramps, use enteric-coated peppermint oil capsules, not tea, and get a diagnosis first.

Buy enteric-coated peppermint oil capsules, sold specifically for IBS or digestive comfort, since the coating is what carries the menthol past the stomach to the gut. Peppermint tea, mints, and plain oil will not deliver a therapeutic dose, and plain oil tends to cause heartburn.
A common dose is one capsule two or three times a day, taken before meals, and it works best over a few weeks for cramping, pain, and bloating rather than as a one-off. Swallow the capsules whole, since chewing or breaking them defeats the whole point of the enteric coating.
Expect real, if partial, relief of the cramping and pain of IBS, one of the better-evidenced natural options, not a cure or a fix for every symptom. It helps spasm and gas rather more than it helps something like constipation.
The main side effect is heartburn, so it is a poor fit if you have significant reflux or a hiatal hernia. Above all, make sure IBS is actually your diagnosis first: new bowel changes, bleeding, unexplained weight loss, or symptoms starting later in life need a doctor to rule out other causes before you self-treat.

Tomorrow: Ireland and hawthorn
the fairy-tree berry of the hedgerows, with modest real evidence for a struggling heart.

See you then.