Educational information, not medical advice — ask your doctor or midwife.
What is palo brasil?
Palo brasil is the hard red heartwood of a small thorny tree, Haematoxylum brasiletto. The tree grows in dry parts of Mexico and Central America. The wood is sold as chips, shavings or short sticks.
In Latin American home medicine the chips are simmered in water. The water turns a deep pink or red. People drink it as a daily beverage, often called agua de palo de Brasil.
It is a close relative of logwood, Haematoxylum campechianum. Both woods were traded for centuries as red and purple dyes. The same red pigments are what colour the tea.
Here is the honest verdict on the evidence. There are almost no human studies of palo brasil for any health use. Most of what is known comes from test tubes and rodents.
Long traditional use is real, and it is worth respecting. But tradition is not proof that something works, and it is not proof that something is safe. That point is made once here and not repeated in every section below.
How is it thought to work?
No mechanism has been confirmed in people. The ideas below come from laboratory and animal work only.
The red colour comes from brazilin and its oxidised form, brazilein. In test tubes these compounds mop up free radicals, which are reactive molecules linked to cell damage.
In laboratory dishes, extracts of the wood slow the growth of some bacteria and yeasts. Whether that happens inside the human body is not established.
In diabetic rats, extracts have lowered blood sugar in some reports. The effect size varied, and the studies were small. No trial has tested this in people.
Tradition also treats the drink as a mild water pill (diuretic). That effect has not been measured properly in humans.
What forms does it come in?
The most common form by far is raw wood. You will see it sold as:
- loose chips, shavings or curls - short sticks or split billets - pre-bagged tea, sometimes blended with other herbs - capsules of ground wood - liquid tinctures, usually in alcohol
In Mexican markets and herb stalls the chips are the standard item. They are simmered in water and the red liquid is drunk warm or cold.
The same wood is also sold for non-medical uses. It is used as a natural dye, and for guitar parts and furniture. Craft-grade wood may be treated, so it is not meant for drinking.
Where does its reputation come from?
Palo brasil has a long record in Mexican and Central American folk medicine. Healers and home cooks prepared the red water as a daily drink.
It was given for what was called "thin" or "dirty" blood, for kidney and urinary complaints, and for sugar in the urine. Colonial-era herbals and later Mexican herbal catalogues list it under those headings.
The wood also had huge commercial value as a dye. Brazilwood shipments shaped trade routes, and the country of Brazil took its name from a related dye tree.
These records tell us what people believed and did. They do not tell us whether the drink helped them.
When to see a doctor
Stop and get medical help straight away if you have:
- swelling of the lips, tongue or throat, or trouble breathing - a spreading rash or hives - shaking, sweating, confusion or faintness, which can mean low blood sugar - red or brown urine that does not clear after you stop the drink - yellow skin or eyes, or pain in the upper right belly
Book a normal appointment if your blood sugar readings change, if urinary symptoms last more than two days, or if diarrhoea lasts more than two days. Tell your doctor you have been drinking it.
In the United States palo brasil is sold as a herbal tea or dietary supplement. It is not approved by the FDA to treat any disease. In Mexico it is sold openly in markets and herb stalls as a traditional 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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