Educational information, not medical advice — ask your doctor or midwife.
Alchornea castaneifolia is a shrub or small tree of the Amazon basin. It grows along rivers in Peru, Brazil, Bolivia and nearby lands. In the Peruvian Amazon it is widely known as iporuru or ipururo.
The bark is the main part used, with the leaves used less often. River communities soaked the bark in water or cane alcohol. The drink was taken for aching joints, stiffness, stomach trouble and as a tonic for men.
Today you will find it as bark chips, powder, capsules and tinctures, usually sold online.
Here is the honest verdict. There are no published human trials of this plant worth the name. Long use in the Amazon shows the plant was valued, but traditional use is not proof that it works, and it is not proof that it is safe.
This page gives you what is known, what is only claimed, and who should steer clear.
No one has shown how this plant acts in the human body. The lab picture is early and thin.
In rats, bark extracts cut stomach damage caused by alcohol and by painkiller drugs. In other rat tests, extracts eased paw swelling, a standard screen for swelling and pain.
In test tubes, bark extracts slowed Helicobacter pylori. That is a stomach germ tied to ulcers and gastritis. Whether the same thing happens in a living stomach is not known.
The bark is rich in tannins, which soak up free radicals in test-tube assays. Tannins also bind protein, which is why the bark tastes harsh and dry.
Animal doses are not supplement doses, and a rat stomach is not yours. Treat all of this as a lead, not a finding.
Most products are made from the dried bark.
Common forms: - Dried bark chips or shavings, boiled to make a decoction. - Milled bark powder, loose or in capsules. - Alcohol tinctures and liquid extracts.
- Bark steeped in cane spirit, the old village preparation. - Rubs and liniments for sore joints. - Multi-herb "joint" or "rheumatism" blends that list iporuru among several plants.
Labels rarely state how strong the extract is. Blends often hide how little of each herb is present. If a product does not name the plant in Latin, treat it with doubt.
Healers in the Peruvian and Brazilian Amazon used the bark for generations. Written records of that use date mainly from the twentieth century.
It was taken for joint pain, rheumatism and stiffness, often as bark steeped in cane alcohol. It was also used for diarrhoea, stomach pain, coughs and colds. Some communities gave it to men as a strength or virility tonic.
The plant entered the Western herb trade in the late twentieth century, sold mostly under the name iporuru. That trade grew from folklore and marketing, not from trials.
These are records of what people did. They are not a recommendation that you do the same.
When to see a doctor:
Stop taking it and get same-day medical help if you notice: - Yellow skin or yellow eyes, dark urine, or pale stools. - Severe or lasting stomach pain. - Vomit that looks like coffee grounds, or black tarry stools. - A spreading rash, swelling of the lips or face, or trouble breathing. - Fainting, a racing heart, or confusion.
Book a routine appointment if: - Joint pain, swelling or stiffness keeps getting worse. - Diarrhoea lasts more than a few days. - You have diabetes and your readings swing after starting it. - Nothing has changed after two to three weeks.
In the United States it is sold as a dietary supplement and is not approved as a medicine. In the United Kingdom and the European Union it holds no licensed medicine status, and its food status is unclear, so it is sold mainly online. In Peru and Brazil it is used as a traditional plant remedy.
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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