Educational information, not medical advice — ask your doctor or midwife.
Spearmint is the common garden mint. Its leaves flavour tea, sauces, sweets and chewing gum. The plant is Mentha spicata, also listed in older books as Mentha viridis.
As a remedy, it was used for upset stomach, wind and nausea. Newer interest has moved elsewhere. Spearmint tea has been tested for hormone levels in women, and spearmint extracts are sold for memory and focus.
Here is the short verdict. As a food and an everyday tea, spearmint is safe for most people. As a treatment, the human evidence is thin and comes from a handful of small studies.
Long use in folk medicine is not proof that something works. It is also not proof that it is safe. This page says plainly where the evidence runs out.
Most of what we know about how spearmint acts comes from the lab, not from people.
Spearmint leaves hold rosmarinic acid and other polyphenols (plant compounds that mop up damaging molecules). In test tubes these slow some inflammation signals. Whether that happens in your body at tea-sized amounts is not known.
In two small human trials, spearmint tea lowered free testosterone (a male-type hormone that women also make). How it does this is unclear. One idea, untested in people, is that it changes how the body makes or carries that hormone.
Mint oils relax smooth muscle in lab strips of gut tissue. This is shown best for peppermint, which is a different plant. It is the usual explanation for mint easing cramps, but for spearmint it stays an explanation, not a proven result.
A branded spearmint extract high in rosmarinic acid has been studied for memory. In animals it appears to shield brain cells from oxidative stress (damage from unstable molecules). The link between that lab finding and the human results is not established.
Spearmint is sold as a food, a tea and a supplement.
- Fresh or dried leaf, for cooking and for tea. - Tea bags, plain or in blends. - Capsules or tablets of leaf extract, often standardised for rosmarinic acid.
- Essential oil, used for scent and flavour. - Toothpaste, mouthwash and chewing gum. - Flavouring in sweets and drinks.
The oil is very concentrated and is not a strong tea. Food and flavour uses have the longest safety record. Extracts are newer, and the amount per capsule varies widely by brand.
Labels should name the plant and the part used. A label that says only "mint" tells you little.
Spearmint came to North America with European settlers and spread into gardens, ditches and damp ground.
Nineteenth-century American Eclectic doctors listed it as a mild remedy. They gave warm leaf infusions for upset stomach, wind, hiccups and the nausea of fevers. It was also given to children and to people recovering from illness.
Eclectic writers rated it as gentle rather than strong. Peppermint was their choice when they wanted a sharper effect. Spearmint was often used for urinary complaints and to make other medicines taste better.
It also had a long kitchen life in sauces, jellies and cordials. Mint waters were common in home medicine chests.
These records tell you what people did and believed. They do not tell you whether it worked.
Stop and see a doctor if you get a rash, swelling of the lips or mouth, or wheeze after spearmint.
See a doctor if stomach pain, heartburn or nausea lasts more than two weeks or keeps coming back. Get urgent care for blood in your vomit or stool, black stools, trouble swallowing, or weight loss you cannot explain.
Call emergency services if anyone swallows mint essential oil, especially a child. Warning signs include drowsiness, vomiting, fits and trouble breathing.
In the United States, spearmint is an ordinary food. The FDA treats the leaf and its oil as generally recognised as safe for food use. Supplements are not checked before sale, so quality varies by brand.
In the UK and EU, spearmint is a food and flavouring. A product making medical claims would need a licence.
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.
One email with the summary. We'll also send a short weekly evidence update — unsubscribe any time.
