Educational information, not medical advice — ask your doctor or midwife.
Nyame dua is the bark of Alstonia boonei, a tall West African forest tree. In Twi the name means "God's tree". The bitter bark has long been boiled into a drink for fever, malaria and joint pain.
The most important thing to know is about malaria. Using bark tea in place of a proper antimalarial drug can be dangerous. Malaria can get worse within hours, so a test and real treatment come first.
The honest verdict on evidence: almost all of it comes from test tubes and rodents. Human trials are very few and very small. Long traditional use is not proof that the bark works, and it is not proof that it is safe.
No one has shown in people how this bark works, or that it works.
The bark holds bitter indole alkaloids, a group of plant chemicals. In rodent studies, extracts of the bark lowered fever and reduced swelling. In lab dishes, extracts slowed the growth of the malaria parasite.
Animal work also points to effects on pain signals and on the gut. One alkaloid, echitamine, lowered blood pressure and slowed the heart in animals.
None of this tells you what happens in a human body. A chemical that acts on cells in a dish may do nothing useful when you drink a tea. Treat these as leads, not as proven actions.
The bark is sold and used in several forms:
- Dried bark pieces or chips, boiled in water as a decoction - Bark powder, loose or in capsules - Alcohol or spirit soaks (tinctures) - Mixed herbal products sold for fever or "blood cleansing" - The milky latex and fresh leaves, used on skin in some villages
The stem bark is the part used most often. Root bark is used in some places and may be stronger.
Most products are not standardised. Few labels tell you how much alkaloid is in the bag.
Alstonia boonei holds a respected place across West and Central Africa. The Akan name nyame dua links the tree to God, and the light wood was carved into stools, drums and coffins.
Healers in Ghana, Nigeria, Cameroon and Ivory Coast have used the bark for generations. Recorded uses include fever and malaria, aching joints, pain after childbirth, and snakebite.
The bark also appears in the Ghana Herbal Pharmacopoeia and in Nigerian herbal practice. That shows the plant is taken seriously, not that home use is wise.
Stop and see a doctor if you feel dizzy, faint, unusually slow in the pulse, or very drowsy.
Get urgent care the same day if you have a fever that does not settle, shaking chills, confusion, or you cannot keep fluids down. These can be signs of malaria getting worse.
Go to an emergency department if you have chest pain, fainting, yellow eyes or skin, dark urine, or severe stomach pain.
Tell any doctor treating you that you have taken Alstonia boonei bark, and take the packet with you.
In Ghana and Nigeria the bark is a recognised traditional medicine and appears in national herbal pharmacopoeias. In the United States, United Kingdom and European Union it is not an approved medicine. It may be sold as a herbal or dietary supplement, with no check that the contents match the label.
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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