Educational information, not medical advice — ask your doctor or midwife.
African locust bean is the seed of Parkia biglobosa, a tall tree of the West African savanna. The boiled, fermented seeds become a dark, strong-smelling condiment used in cooking.
It carries many names. Hausa speakers call it dorowa. In Yoruba it is iru, in Ghana and Nigeria dawadawa, and in Burkina Faso and Mali soumbala.
Most people meet it as food, not medicine. A spoonful deepens the taste of soups, stews and rice dishes. Healers have also used the bark, leaves, pods and roots in home remedies.
Here is the honest verdict. As a food it is well known, nourishing and eaten daily by millions. As a medicine it has almost no testing in people, so the health claims around it stay unproven.
Long use in a tradition is not proof that something works. It is also not proof that it is safe. That point applies to every claim further down this page.
No one has shown in people how African locust bean acts as a medicine. What follows is lab and animal work, and it may not carry over to you.
Fermentation is the biggest change. Bacteria, mostly Bacillus subtilis, break the seed protein into free amino acids and small peptides. This is what gives the savoury taste and the smell.
In test-tube studies, some of these peptides appear to block ACE, an enzyme that helps raise blood pressure. That is the same target some blood pressure drugs use. Whether eating the condiment lowers blood pressure in people has not been shown.
In rodents, extracts of the seed and bark have lowered blood sugar and blood fats. The doses used were concentrated extracts, not a spoon of seasoning. Animal results often fail when tested in humans.
In laboratory tests, bark extracts slow the growth of some bacteria and fungi. Tannins and flavonoids in the bark are the likely reason. Nothing shows this clears an infection in a person.
The clearest benefit is plain nutrition. The seeds are rich in protein, fat, iron and calcium. Fermenting them also cuts phytates, which otherwise lock up iron and zinc.
The common form is the fermented seed condiment, sold loose or pressed into dark balls or cakes.
A dried and ground powder is also sold. It keeps longer and is easier to measure into a pot.
Some brands sell it as seasoning cubes or blended stock powders. These often add a lot of salt, so check the label.
Raw dried seeds are sold for fermenting at home. Unfermented seeds are hard, bitter and not eaten as they are.
You may also see the pulp from the pod, a sweet yellow powder, used in drinks and porridge.
Medicinal forms are mostly bark or leaf decoctions made at home. Capsules and tinctures of bark extract appear online. None of these are standardised, and their strength is unknown.
African locust bean has been a staple of the West African savanna for centuries. The tree was protected on farmland rather than cleared, and its pods were a trade good across the Sahel.
In many homes the fermented seed took the place of meat stock. It gave cheap protein and strong flavour to daily meals.
Traditional healers used other parts of the tree. Bark decoctions were given for diarrhoea, fevers and wounds. Leaves were applied to skin complaints and sore eyes.
Some communities used bark washes for toothache and mouth sores. Root preparations appeared in remedies for stomach pain.
These uses are recorded by ethnobotanists, who study how communities use plants. Recording a use is not the same as testing it. This page describes that history; it does not recommend copying it.
See a doctor if you get a rash, swelling of the lips or face, or trouble breathing after eating it. Those are signs of an allergic reaction.
Get urgent care if you take an MAOI and develop a pounding headache, a racing heart, chest pain or a stiff neck.
See a doctor if diarrhoea lasts more than two days, or at once for a baby, an older adult or anyone who cannot keep fluids down.
Do not treat fever or suspected malaria at home. Get tested the same day.
Stop any bark or leaf preparation and see a doctor if you get vomiting, belly pain, dark urine or yellow eyes.
In West African countries it is an ordinary food and is sold freely in markets. In the UK, EU, US and Canada it is sold as a food ingredient, mostly in African grocery shops. Bark or leaf capsules sold as supplements are not approved as medicines anywhere and are not tested for strength.
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.
One email with the summary. We'll also send a short weekly evidence update — unsubscribe any time.
