Educational information, not medical advice — ask your doctor or midwife.
Black horehound is a hairy, strong-smelling plant in the mint family. It grows on roadsides, banks and hedges across Europe. The dried leafy tops are used as a tea or a liquid extract.
In French it is known as ballote noire. Folk healers reached for it when someone felt sick, tense or could not sleep. It is not the same plant as white horehound (Marrubium vulgare), which is used for coughs.
Here is the honest verdict. Good human studies on black horehound are almost absent, so its standing rests on long use alone. Long use is not proof that a plant works, and it is not proof that it is safe.
No one has shown how black horehound works in the human body.
In test tube studies, extracts bound to brain sites that handle dopamine, opioids and calming signals. Those sites play a part in sleep, mood and vomiting. Whether a cup of tea does the same thing in a person is not known.
The plant is also rich in compounds that mop up free radicals in lab tests. Free radicals are unstable particles that can damage cells. This finding comes from a dish, not from people.
The bitter taste may play a part in the old stomach uses. Bitter plants have long been taken to settle the gut. That idea has not been tested for this herb.
So any account of how it works is still a theory. The trials needed to check it have not been run.
Dried leafy tops are the usual form. They are sold loose or in tea bags. French pharmacies stock them under the name ballote noire.
Liquid forms are common too. These include tinctures and fluid extracts made with alcohol or glycerine. Some are blended with hops, lemon balm or valerian.
Capsules and tablets of dried extract are sold as supplements. Label strength is not written in a standard way. Equal weights of two products may not act alike.
It is not sold as an essential oil. Fresh plant use is rare outside home gardens.
European folk healers used the herb for a churning stomach, nausea and frayed nerves. Written herbals in Britain and France mention it over several hundred years. Its strong smell earned it names like stinking horehound.
In France it held a steady place in pharmacy shelves as ballote noire. It was given for travel sickness, coughs and broken sleep. Later it was folded into mixed products for mild nervous tension.
Herbalists also gave it around the menopause for restlessness. These uses were handed down by habit and by books. They were not tested in trials at the time.
Stop taking it and see a doctor if you feel worse, not better.
Get medical help the same day if you have:
- Vomiting that lasts more than a day, or no fluids staying down - Yellow skin or eyes, dark urine, or pain over your right ribs - A rash, swollen lips or face, or trouble breathing - Deep drowsiness or confusion
Book a routine appointment if nausea, tension or poor sleep lasts more than two weeks. Ongoing symptoms deserve a proper check, since they can point to a treatable cause.
In the European Union, Ballota nigra has been reviewed as a traditional herbal medicine, and French pharmacies sell it as ballote noire. In the United Kingdom and the United States it is usually sold as a food supplement. No drug regulator has approved it as a proven treatment for any disease.
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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