Educational information, not medical advice — ask your doctor or midwife.
What is African walnut?
African walnut is the seed of a climbing vine from West Africa. Its botanical name is Plukenetia conophora. It is eaten as a food, not sold as a drug.
The nuts are usually boiled in their shells and eaten warm. They taste bitter. Water sipped straight after tastes oddly sweet, which is part of their fame.
In Nigeria it is known as Awusa or Asala in Yoruba, and Ukpa in Igbo. It is not the same plant as the English walnut, Juglans regia.
Tradition also treats the nut, the leaf and the pressed oil as medicine. Claims include help with coughs, male fertility and general strength. Human evidence for those claims is very thin.
Please read that last point as a theme for the whole page. Long use in a tradition is not proof that something works. It is not proof that it is safe either.
As a food, the nut is a decent source of plant protein and fat. As a treatment, it has not been tested in people in any serious way.
How is it supposed to work?
The short answer is that no one has shown how it works in people. What follows comes from lab and animal work only.
The nut oil is rich in alpha-linolenic acid, a plant omega-3 fat. Diets high in this fat are linked to heart health in general. That link comes from other foods, not from trials of this nut.
In test-tube studies, extracts of the nut and leaf mop up free radicals, which are unstable particles that damage cells. Whether eating the nut does this inside your body is not established.
In rats, extracts have been fed to test effects on sperm and hormones. The results clash. Some studies report better sperm counts, others report harm at high doses.
That split matters. A traditional fertility claim does not survive animal data that points both ways. Treat the fertility use as unproven, not as supported.
In laboratory tests, the nut also shows mild antibacterial activity. Nothing shows that this helps a cough or a chest infection in a person.
How do people buy and use it?
Most people meet it as a boiled snack nut, sold warm by the cup at markets and roadsides. That is the main form by far.
Other forms you may see:
- Raw nuts in the shell, sold to be boiled at home - Roasted or ground nuts, used in snacks and pastes - Pressed conophor oil, sold for cooking, skin or hair - Dried leaves, brewed as a tea in some areas - Powders and capsules, mainly from online sellers
One warning about the oil. Conophor oil dries hard in air, so it has long been used in paint, ink and varnish. Oil sold for those jobs is not food and must never be swallowed.
Capsules and powders are not standardised. Two products can differ widely in what they contain. Labels often make claims that no trial supports.
What did tradition claim?
African walnut has been eaten in southern Nigeria, Cameroon and nearby countries for centuries. It was a seasonal snack, a trade good and a village cash crop.
Healers used it for more than food. Recorded uses included treating coughs and chest trouble, easing constipation, and building strength after illness.
The most quoted claim was about men. The nut was given to improve fertility and sexual strength. Some communities told men to avoid it for the same reason, which shows how uncertain the belief was.
The leaves were brewed as a tea for stomach complaints and fever. The pressed oil was rubbed on skin and hair, and also used as a varnish for wood and local crafts.
These uses are recorded here as history. They are not an instruction to treat yourself with the nut.
Call emergency services if your lips, tongue or throat swell, if your chest tightens, or if you struggle to breathe after eating the nut. That is a severe allergic reaction.
Stop and see a doctor if you get an itchy rash, hives, repeated vomiting or bad stomach pain.
See a doctor if a cough lasts more than three weeks, or if you cough up blood. Do not treat that at home.
If you have diabetes and your sugar readings drop, contact your doctor or pharmacist.
In Nigeria, Cameroon and nearby countries it is an ordinary food, sold freely at markets. In the United States, the United Kingdom and the European Union it is treated as a food or a food supplement, not a licensed medicine. No health claim for it has been approved by any of these regulators.
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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