Educational information, not medical advice — ask your doctor or midwife.
Tutsan is a small woody shrub in the St John's wort family. Its dried leaves and flowering tops are brewed as a tea. In northern Portugal it is called hipericão-do-Gerês.
Folk use in Portugal and Spain focused on the liver, the gallbladder and urine flow. The tea is still sold there in herb shops and markets. Traditional use is not proof that a remedy works, and it is not proof that it is safe.
The honest verdict on evidence is short. No good human trials support any use of tutsan. Almost everything known comes from test-tube and animal work.
Nobody has shown how tutsan acts in the human body.
In test tubes, extracts mop up free radicals (unstable molecules that can harm cells). In rats, extracts have lowered some markers of liver stress. Whether that helps a person's liver is unknown.
In lab dishes, extracts also slow the growth of some bacteria. This has not been tested as a treatment in people.
Tutsan is often compared with St John's wort, a close relative. That plant speeds up how the liver clears many drugs. Tutsan holds far less hyperforin, the compound behind that effect.
Even so, the risk has not been ruled out in people. Treat a drug interaction as possible, not as settled.
The usual form is dried aerial parts, meaning leaves, stems and flower tops, sold loose for tea.
You may also see tea bags and liquid extracts in alcohol. Capsules and dried powder exist but are less common.
The red-to-black berries are not a food. They are treated as unsafe to eat and should be left alone.
Labels can mislead. Some products sold as hipericão hold St John's wort instead. Look for the Latin name Hypericum androsaemum on the pack.
Tutsan has a long record in European folk practice. The English name comes from the French toute-saine, meaning all-heal.
Herbalists once laid the fresh leaves on cuts, burns and bruises as a dressing. Written mentions of this go back several centuries.
In the Gerês hills of northern Portugal, the tea was drunk for the liver, the gallbladder and urine flow. That regional habit carries on today.
None of this old use was tested the way a modern medicine is.
Stop the tea and see a doctor if you notice any of these:
Yellow skin or eyes, dark urine or pale stools. Severe or lasting pain in the upper right belly. A rash, swollen lips or trouble breathing, which need urgent care.
Also see a doctor if swelling in your legs or belly does not settle. The same goes for any symptom that keeps getting worse.
Tell your doctor or pharmacist that you have been drinking tutsan tea. Bring the packet if you can.
In Portugal and Spain tutsan is sold freely as a herbal tea and food supplement. In the United States it may be sold as a dietary supplement, which means no health claim is approved by the FDA. No medicines regulator has approved it to treat any condition.
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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