Educational information, not medical advice — ask your doctor or midwife.
Vervine is a weedy tropical plant with thin, blue-purple flower spikes. Its botanical name is Stachytarpheta jamaicensis. In the Caribbean the leaves and stems are brewed as a bitter bush tea.
It is called verbena cimarrona in Cuba and vèvenn in Haiti. The name "vervine" is loose. In parts of Haiti it can mean lemongrass, and shop tea marked "vervain" is often a European plant instead.
Folk use covered fevers, colds, upset stomach, worms and sore joints. Human evidence for any of this is very thin. Long traditional use is not proof that a plant works, and it is not proof that a plant is safe.
No one has shown how vervine acts in the human body. What exists is lab and animal work.
In test tubes, extracts of the leaf show antioxidant activity. In rodents, leaf extracts have dulled pain and reduced swelling in standard test models.
In diabetic rats, leaf extracts lowered blood sugar. Whether that happens in people, and at what dose, has not been tested.
The plant is bitter and, in strong brews, loosens the bowels. That effect is reported by users and fits its folk use as a purge. It is the one action most likely to be felt.
Treat all of the above as a starting point for research, not as proof of a medical effect in people.
Most people meet vervine as a home-brewed tea from fresh or dried leaf.
Common forms: - fresh leaves and stems, steeped in hot water - dried loose herb, sold in Caribbean markets - capsules and tinctures, mostly from online sellers - crushed leaves laid on the skin as a poultice - bath and wash preparations, used in some islands
Labelling is the real problem here. Packets marked "vervain" often hold Verbena officinalis, a different plant. Haitian "vèvenn" may be lemongrass.
If you want this plant, check the pack for the Latin name Stachytarpheta jamaicensis. If the Latin name is missing, you do not know what you have.
Vervine has long standing as a Caribbean yard medicine. Households in Jamaica, Cuba, Haiti and the eastern islands grew it or let it grow.
Recorded folk uses included fevers, colds, worms, gripe and sore joints. Bitter teas were also given to "clean the blood" after illness. Healers in some islands used strong doses to bring on a late period.
The plant spread with people and is now a weed across the tropics. Similar uses were written down in West Africa, Brazil and Southeast Asia.
This record tells you what people did. It does not tell you that the plant worked, and it was not collected with safety in mind.
Stop using vervine and see a doctor if you get any of these: - diarrhoea or vomiting that lasts more than a day - severe stomach pain - dizziness, fainting or a racing heart - signs of low blood sugar, such as sweating, shaking or confusion - a spreading rash, or swelling of the face or throat - yellow skin or eyes, or dark urine
Get urgent care for a fever above 39C, a fever with a rash, a stiff neck, or a fever that will not settle. These need a diagnosis, not a bush tea.
Vervine is not approved as a medicine in the United States, the United Kingdom, Canada or the European Union. In the United States it may be sold as a dietary supplement, which means it is not checked for strength or purity before sale, and no health claims are approved.
In the UK and EU it holds no traditional herbal registration. Across the Caribbean it is sold freely in markets and gathered wild.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Vervine is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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