What is African yellow wood?

African yellow wood is the bark of Enantia chlorantha, a forest tree of West and Central Africa. Healers there used the bright yellow inner bark as a bitter tonic. The Yoruba name is awopa.

Most of it is sold as dried bark, bark powder, capsules or dark bitter mixes. The yellow colour comes from a group of plant alkaloids. These same compounds give the bark its very bitter taste.

Here is the honest verdict. Nearly all the research sits in test tubes and in rodents. There are no good human trials, so no health benefit is proven in people.

Long use in a tradition tells you the plant mattered to people. It does not tell you the plant works, and it does not tell you it is safe.

How does African yellow wood work?

No one has shown what this bark does inside the human body. What follows is lab and animal work only.

The bark is rich in protoberberine alkaloids, a bitter yellow group of plant compounds. In test tubes, these slow the growth of the malaria parasite. Whether that happens in a person taking the bark is not known.

In rodents, bark extracts have lowered blood sugar and reduced some markers of liver stress. Rodent results often fail to repeat in people. Treat them as a question, not an answer.

Bitter plants like this one are also thought to boost saliva, stomach juices and bile flow. That idea is old and plausible. It has not been tested well in people for this bark.

Berberine, a close relative of the main alkaloids here, is known to block some drug-handling enzymes in the gut and liver. That is why the drug cautions on this page matter.

What forms does African yellow wood come in?

You will meet it in a few forms:

- Loose dried bark or bark chips, for boiling - Bark powder, loose or in capsules - Tinctures and alcohol extracts - Blended "bitters" sold in bottles, often with other herbs - Topical pastes and washes, in home use

Blended bitters are the hardest to judge. They often hide several herbs and sometimes added alcohol. The label may not list real amounts.

Where it comes from:

Bark of this tree held a steady place in West and Central African healing. Records from Nigeria, Cameroon and Ghana describe its use across many groups.

Healers boiled the bark and gave the bitter liquid for fever and malaria. They also used it for yellow eyes and skin, for stomach complaints and for wounds.

The bark doubled as a yellow dye for cloth and wood. Market sellers in Nigeria still stock it under names such as awopa and dokita igbo.

This page reports that history. It does not suggest you copy it at home.

What does African yellow wood help with?

• Malaria and fever: This was the headline traditional use. Healers boiled the bark and gave it for fever thought to be malaria. In test tubes, bark extracts slow the malaria parasite. Rodent studies show mixed results. There is no trial showing it clears malaria in people. Malaria can kill within days. Get tested and treated with proven medicine.
• Jaundice and liver complaints: Tradition linked the yellow bark to yellow eyes and skin. This matching of colour to illness was a common idea, not a test result. In rats given liver poisons, bark extracts lowered some blood markers of liver damage. That is early animal work. No human study supports it. Jaundice in an adult or a baby needs a doctor, fast.
• Stomach upset and poor appetite: Bitter barks were widely taken before food to wake up the appetite. This bark was one of them. Bitter taste does trigger saliva and stomach juices. That general effect is known. Whether this bark eases indigestion in people has not been tested. Call it plausible and unproven.
• Wounds and skin infections: Pastes and washes from the bark were put on sores, cuts and skin rashes. In lab dishes, bark extracts slow the growth of some bacteria and fungi. Dish results do not predict what happens on skin. No human trial has tested it on wounds. A spreading, hot or pus-filled wound needs medical care.
• High blood sugar: This is a newer claim, pushed by sellers rather than by old tradition. In diabetic rats, bark extracts lowered blood sugar. Berberine, a related compound, does lower blood sugar in people. That does not prove this bark does. If you take diabetes medicine, the risk of sugar dropping too low is real.
• Diarrhoea and gut infections: Bark drinks were used for loose stools and belly cramps. The tannins in the bark are astringent, which may firm stools. Lab tests show some action against gut bacteria. Human evidence is absent. Diarrhoea with blood, high fever or heavy fluid loss needs a doctor.

Which foods are rich in African yellow wood?

This is a medicinal tree bark, not a food. It is not part of any normal diet. You will not get it from eating anything.

What are the side effects of African yellow wood?

• Strong bitter taste and gagging
• Nausea and stomach pain
• Loose stools or constipation
• Low blood sugar, with shakiness or dizziness
• Headache
• Yellow staining of stools or urine
• Rash or itching from skin use
• Signs of liver strain, such as yellow eyes or dark urine

Good to know:

Mild gut upset is the complaint reported most often. The bitterness alone puts many people off.

The serious worries are liver strain and drug interactions. Both are based on animal work and on what close relatives of these alkaloids do.

Because there is no safety trial in people, rare harms would not yet be known. Absence of reports is not the same as a clean record.

How much African yellow wood should you take?

• Recommended daily: This page gives no amount, and here is why. There is no agreed dose for this bark. No human trial has set a safe or useful amount. Alkaloid strength also swings widely between batches. Some capsule labels list a few hundred milligrams of bark powder. Those numbers come from the seller, not from research. Treat them as marketing, not guidance. If you are set on trying it, work with a doctor or pharmacist who knows your medicines.
• Best time of day: No time of day has been shown to work better. Bitter tonics were often taken before a meal, to stir the appetite. That is custom, not proof.
• With or without food: There is no evidence either way. The bark is harsh and very bitter. Taking it on an empty stomach makes nausea more likely. Taking it with food is the gentler choice.
• Time to effect: Nobody can give you an honest timeline, because the effects are not proven. The bitter taste acts at once. Anything beyond that is unknown. It may do nothing at all for your complaint. If you feel worse at any point, stop and get checked.
• How long to take it: No safe length of use has been worked out. Traditional use was short and tied to an illness, not daily for months. Long daily use has never been studied in people. Rodent studies at high doses have shown liver and testicle changes. That is a reason to avoid open-ended use.