Educational information, not medical advice — ask your doctor or midwife.
African locust bean is a food, not a pill. The seeds of the Parkia biglobosa tree are boiled, then left to ferment. The result is a dark, soft, strong-smelling paste used to season soups and stews.
It goes by many names. In Yoruba it is iru. In Hausa it is dawadawa, in Senegal netetou, and in Burkina Faso soumbala.
Cooks use it the way others use stock cubes or fish sauce. A small amount gives a deep, savoury, slightly funky taste. It also adds protein, fibre and minerals to a meal.
The evidence verdict is simple. As a food it is nutritious and well established. As a medicine, it has almost no human testing behind it.
Long use does not prove that it treats illness. It also does not prove that it is safe for everyone. Keep that in mind for every claim listed further down this page.
Almost everything claimed for this plant as a medicine comes from lab dishes or animals, not people.
Fermentation does the main work in the food. Bacillus subtilis bacteria break the seed protein into smaller pieces. This makes it easier to digest and builds the strong flavour.
In test-tube studies, some of these protein pieces act as antioxidants, meaning they mop up damaging molecules. Whether that changes anything inside your body has not been shown.
Bark and leaf extracts are a separate story. In rats, these extracts have lowered blood sugar and blood pressure. Those were animal doses of concentrated extract, not spoonfuls of seasoning.
The seeds themselves are rich in fibre and unsaturated fat. Diets higher in both are linked with better heart health. That link comes from broad nutrition research, not from trials of iru.
You will most often meet it as a kitchen condiment.
- Wet paste, sold fresh and wrapped in leaves - Dried balls, cakes or flat discs - Dry powder in sachets or jars - Seasoning cubes that list dawadawa among the ingredients - Bark, root or leaf decoctions used by traditional healers
Fresh paste spoils fast and is normally kept cold. Dried and powdered forms last much longer.
Capsules and extracts are rare in shops. They are not standardised, so strength is anyone's guess.
The tree has been central to life across the West African savannah for centuries. People valued it for food, shade, firewood and medicine.
Fermented seeds were a main source of protein and savoury flavour long before stock cubes arrived. Making and selling iru or dawadawa was usually women's work and a steady income.
Traditional healers used other parts of the tree. Bark decoctions were given for diarrhoea, fever, wounds and sore eyes. Leaves and roots appeared in many other remedies.
Much of this is recorded in surveys of plant use. Those surveys describe what people did. They do not test whether it helped.
Call emergency services if, after eating it while on an MAOI or linezolid, you get a sudden pounding headache, chest pain, a very fast heartbeat or blurred vision.
Get urgent help for swelling of the lips, face or throat, a spreading rash, or trouble breathing.
See a doctor if vomiting or diarrhoea lasts more than a day, or if there is blood in it.
Talk to your doctor or pharmacist before using any bark or root remedy, especially if you take regular medicine. Never use it in place of malaria treatment or diabetes care.
In West Africa it is an ordinary market food. In the UK, EU and US it is sold as a food ingredient, not a medicine, and no regulator has approved it to treat any condition.
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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