Educational information, not medical advice — ask your doctor or midwife.
Mountain avens is a low alpine plant whose dried leaves are brewed as a tea in Iceland and northern Scandinavia. Its botanical name is Dryas octopetala. The white flower has eight petals, which is where the Latin name comes from.
In Iceland it is called holtasóley, and the leaf used for tea is called rjúpnalauf. It is the Icelandic national flower. The leaf tea has been drunk as a daily hot drink and, in folk use, for upset stomachs and coughs.
Here is the honest verdict. We found no trials of mountain avens in people. Long traditional use is not proof that it works, and it is not proof that it is safe.
Nobody knows how mountain avens acts in the body. No human study has tested it.
The leaves are rich in tannins. Tannins are plant compounds with a dry, puckering taste. In test tubes they bind proteins and can slow the growth of some microbes.
Lab work on Dryas extracts has reported antioxidant activity, meaning they mop up reactive molecules in a dish. That is a chemistry result. Whether anything similar happens in a person drinking the tea has not been shown.
The folk reasoning was simpler. A dry, astringent tea was thought to tighten a loose gut. That fits how tannins behave in a test tube, but it has not been tested in people.
Most people meet it as dried loose leaf for brewing.
Forms you may see: - Loose dried leaf, sold by weight - Tea bags, often labelled rjúpnalauf or Icelandic herb tea - Blends with other Icelandic herbs, such as wild thyme (blóðberg) - Tinctures, which are alcohol extracts; uncommon - Capsules; rare, and not standardised
Some skincare brands list Dryas octopetala extract on the label. Those claims rest on laboratory work, not on skin trials in people.
Mountain avens has a long record as a hot drink in Iceland and parts of northern Scandinavia.
Writers in the 18th and 19th centuries described the leaf as a home-grown stand-in for imported tea, which was costly. Folk healers gave it for upset stomachs, loose bowels and chesty coughs.
The name rjúpnalauf means ptarmigan leaf. The ptarmigan is a hardy northern bird that feeds on the plant in winter. Naming it the national flower kept the plant in everyday memory, and the tea stayed in use.
Stop drinking it and see a doctor if: - Diarrhoea lasts more than two days, or you see blood in your stool - You have a fever with the stomach upset - A cough lasts more than three weeks, or you cough up blood - You feel unusually tired, pale or breathless, which can point to low iron - You have bad stomach pain or keep vomiting
Get emergency help if your lips, tongue or throat swell, you come out in hives, or you start to wheeze. These are signs of a severe allergic reaction.
In Iceland and the wider European Economic Area, mountain avens leaf is sold as an ordinary herbal tea. It is not licensed as a medicine. In the United States it would fall under dietary supplement rules, and it is rarely sold there. In parts of the Alps the wild plant is protected, so picking it can be against the law.
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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