Educational information, not medical advice — ask your doctor or midwife.
Clinopodium nepeta is a small mint-family herb from the Mediterranean. Italian cooks call it nepitella or lesser calamint. It smells of mint and oregano at the same time.
It is used mostly as a food. Cooks add it to mushrooms, artichokes, beans and roast meat. Country healers also brewed the leaves as a tea for gas, coughs and head colds.
Here is the honest verdict. There are almost no human trials of this herb. Long use in kitchens and folk medicine is not proof that it treats anything, and it is not proof that it is safe in large amounts.
One point matters more than the rest. The plant's essential oil is rich in pulegone, the same compound that makes pennyroyal oil dangerous. Food amounts of the leaf are a different thing from the concentrated oil.
No one has shown how this herb acts in the human body. What follows comes from lab and animal work, not from patients.
In test tubes, the essential oil slows the growth of some bacteria and fungi. Whether that happens inside your gut or on your skin is not known.
In animal tissue studies, parts of the oil relax smooth muscle, the muscle in the gut wall. That is the usual reason given for the old use against cramps and gas. It has not been tested this way in people.
The herb also holds rosmarinic acid and flavonoids. These mop up free radicals in a dish in the lab. An antioxidant result in a dish does not mean a health effect in a person.
Pulegone is the one compound with a clear human story, and it is a warning rather than a benefit. The liver turns pulegone into a product that can damage liver cells. This is documented from pennyroyal oil poisonings.
Fresh leaves and sprigs, sold as nepitella in Italian markets.
Dried leaf, used as a kitchen herb and for tea.
A steeped tea or infusion of the dried leaf.
Essential oil, sold for scent and for lab use. This is the concentrated form and the risky one.
Capsules and tinctures exist but are uncommon. Labels rarely state how much pulegone the product contains.
In Italy, nepitella has been a kitchen staple for centuries, above all in Tuscany. It was the standard partner for wild mushrooms and artichokes.
Mediterranean folk healers used the leaf tea for gas, stomach cramps, coughs and colds. The crushed leaf was also rubbed on insect bites.
Older herbals grouped it with the mints and calamints, and the names were often mixed up. That muddle still shows up in old texts today.
Call emergency services if anyone swallows the essential oil. Take the bottle with you.
Get urgent care for yellow skin or eyes (jaundice), dark urine, repeated vomiting, or pain under your right ribs. These can be signs of liver injury.
Seek help straight away for swelling of the lips or tongue, a rash, or trouble breathing. That is an allergic reaction.
Stop drinking the tea and see your doctor if stomach pain or heartburn keeps up. Also see a doctor if a cough lasts more than three weeks.
In the EU and the UK the dried herb is sold as an ordinary food and flavouring. EU rules cap how much pulegone may be present in food and drink, because of its liver risk. In the US the herb is treated as a food seasoning, and it is not an approved drug anywhere.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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