Educational information, not medical advice — ask your doctor or midwife.
Ground ivy is a low, creeping plant in the mint family. It has round, scalloped leaves and small blue-purple flowers. Many people know it as a lawn weed.
Old American herb books call it gill-over-the-ground. Folk healers used the dried leaf as a tea for coughs, stuffy sinuses and ringing in the ears. It is still sold as dried herb and as a tincture (an alcohol extract).
Here is the honest verdict. Human studies are almost absent, so no health claim for it is settled. Long folk use is not proof that it works, and not proof that it is safe.
The plant also holds pulegone, a liver-toxic oil also found in pennyroyal. That is why amount and form matter with this herb.
No one can say how ground ivy works in people. The trials that would answer that have not been done. What exists is lab work.
In test tubes, extracts show antioxidant activity. They also slow the growth of some bacteria and fungi. Whether that happens in your body is unknown.
In cell studies, extracts lower some markers of inflammation (swelling and irritation). Animal work hints at a mild effect on urine flow. These are early signals, not proof of a human effect.
Tradition framed the herb as drying, and as a way to thin thick mucus. That idea came from taste and watching patients, not from measurement. The bitter, aromatic taste is the likely root of its old use as a digestive tonic.
Ground ivy is sold mainly as the dried above-ground herb, loose or in tea bags. Tinctures (alcohol extracts) are the next most common form. Capsules of powdered leaf turn up less often.
Fresh leaf is sometimes eaten in small amounts as a spring green. Some people use a cooled, strained tea as a skin wash. Both are folk habits, not tested uses.
The essential oil is a different thing altogether. It concentrates pulegone and must never be swallowed.
No standard strength or extract ratio is agreed across brands. Two products with the same name can be very different in strength.
Ground ivy crossed to North America with European settlers and spread fast. English herbalists had long used it for coughs. It also flavoured ale before hops took over, which is where the old name gill comes from.
American folk healers listed it for colds, chest complaints and ringing in the ears. Eclectic doctors of the 1800s wrote it up in books such as King's American Dispensatory. They described it as a mild tonic and used it for lead colic in painters.
It faded from medical use by the twentieth century. Some modern herbalists keep it as a minor remedy for sinus trouble. None of that record rests on controlled trials.
Stop using ground ivy and see a doctor if you feel sick, dizzy or unwell after taking it.
Get urgent medical help for any of these:
Yellow skin or yellow eyes, dark urine, or pain under your right ribs. These can be signs of liver injury.
A seizure, confusion, or repeated vomiting. Call emergency services.
Swelling of the lips, face or throat, or trouble breathing. This can be a severe allergic reaction.
Also see a doctor if a cough lasts more than three weeks, or if ringing in your ears is new or in one ear only.
In the United States, ground ivy is sold as a dietary supplement or herbal tea. It is not approved as a medicine, and the FDA has not judged any health claim for it.
In the UK and EU it is sold as a herbal tea. It holds no registered traditional herbal medicine licence. It is also treated as an invasive weed in parts of North America.
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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