Educational information, not medical advice — ask your doctor or midwife.
What is Acanthospermum australe?
Acanthospermum australe is a low, sprawling weed in the daisy family. It grows wild across South America and now in warm parts of Africa and Asia. Folk healers used the leaves and stems, most often as a tea.
The plant is known by local names such as Paraguayan starbur, carrapicho and mata-pasto. It is sold now and then as a dried loose herb or a tincture. It is not a common shelf product in Europe or North America.
Here is the honest verdict on evidence. There are no good human trials of this plant. Lab and animal work exists, but it is early and it does not tell you what happens in a person.
Long use in folk medicine is not proof that a plant works. It is also not proof that a plant is safe. That point applies to everything on this page, so it is made once here.
How is it thought to work?
No one has shown how, or whether, this plant works in people.
Most of the lab interest comes from its sesquiterpene lactones. These are bitter plant compounds found across the daisy family. In test tubes, extracts of related plants slow some parasites, bacteria and viruses.
For Acanthospermum australe itself, test-tube work has reported activity against malaria parasites. Some cell studies also report antiviral activity. Whether any of this happens in a human body is not established.
Sesquiterpene lactones are also the compounds behind daisy-family skin rashes. That part is well known from contact with the plants. It is a reason for care, not a reason to expect a benefit.
What forms does it come in?
It is most often met as the dried above-ground plant, used for a tea.
Forms you may see:
- Dried loose leaves and stems - A water infusion or boiled tea, in folk practice - An alcohol tincture, sold by small herb traders - A crushed fresh plant used on the skin, in folk practice - Rarely, capsules of dried powder
There is no standard extract and no agreed marker compound. Labels rarely state how much active material is present. Quality and identity vary from seller to seller.
What did tradition claim?
Acanthospermum australe has a steady place in South American home medicine, mainly in Brazil, Paraguay and Argentina.
Healers used teas of the plant for fever and for malaria-like illness. It was also used for stomach upset, for "liver cleansing", and for coughs and colds. Crushed plant was laid on skin sores and insect bites.
The plant spread with trade and now grows in parts of West Africa and Asia, where similar uses were recorded. These accounts come from field surveys of local healers, not from trials.
This page records that history. It does not suggest you copy it.
When should you see a doctor?
Get emergency help now if you have swelling of the lips, tongue or throat, trouble breathing, or a sudden spreading rash.
Stop the herb and book a doctor if you notice:
- Yellow skin or eyes, or dark urine - Pain in the upper right side of your belly - Vomiting that will not settle - A fever that lasts more than three days - Any fever after travel to a malaria area, which needs a test the same week
No country licenses Acanthospermum australe as a medicine. In the United States it could be sold as a dietary supplement, with no check that it works. In the UK and the EU it is not an authorised herbal medicine, and it is mostly traded as a dried plant.
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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