Educational information, not medical advice — ask your doctor or midwife.
Guinea hen weed (Petiveria alliacea) is a strong-smelling herb from the Caribbean, Central and South America, and parts of West Africa. People take the leaf or root as a tea, tincture or capsule, most often for joint pain, colds and general "immune support". The whole plant smells of garlic, which is where several of its folk names come from.
Here is the honest verdict up front: guinea hen weed has deep traditional standing across several cultures, but almost no human trial evidence. Nearly everything published is laboratory or animal work. Traditional use tells you what people have done for generations; it does not prove the herb works in your body, and that distinction holds for every claim on this page.
This is also not a gentle kitchen herb. It appears to thin the blood, may lower blood sugar, and has a long-standing reputation for causing miscarriage. Read the safety section before you try it.
No one has shown how guinea hen weed works in people, so what follows is theory drawn from test-tube and animal studies.
The plant is packed with sulphur compounds, the same chemical family that gives garlic its smell. The best-studied one, dibenzyl trisulphide, kills or slows certain cells in laboratory dishes and appears to nudge immune cells in animals. A dish or a mouse is not a person, and these effects have never been confirmed in a human trial.
Guinea hen weed also contains coumarin, a natural compound that can slow blood clotting. Animal work suggests it may lower blood sugar and reduce swelling. Those same mechanisms explain most of its risks, which is why the interaction list below matters more than usual.
The most common form is a tea made from dried leaf, sometimes with a little root added. Capsules of dried powdered leaf or root are widely sold online and in Caribbean shops.
Alcohol tinctures are also popular, and are stronger by volume than tea. In home traditions the fresh leaf is crushed into poultices for the skin, or the plant is burned or hung to keep insects away.
None of these forms is standardised. Product labels rarely state how much dibenzyl trisulphide or coumarin you are getting, so strength is a guess.
Guinea hen weed has been used for centuries across the Caribbean, the Amazon basin and West Africa, under names such as anamu, mucura, tipi and garlic weed. Healers used it for pain, fevers, colds, stomach complaints and to drive out worms.
It also carries spiritual meaning in several African-diaspora traditions, where it is used in cleansing baths and protective rituals. In Jamaica it became widely known in the late twentieth century as a general tonic, and that reputation drives most of today's sales.
Stop the herb and get medical help the same day if you notice bruises you cannot explain, a nosebleed that will not stop, blood in your urine, or black or tarry stools.
Get urgent help if you feel faint, shaky, sweaty and confused, as this can be very low blood sugar. Go to hospital straight away if you are pregnant and have cramping or bleeding after taking it.
See your doctor within a few days if you get a rash, ongoing stomach pain, or if joint pain or a fever is not settling. Always tell your doctor, pharmacist or cancer team that you are taking guinea hen weed, because it can affect your other medicines.
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 Guinea Hen Weed 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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