Educational information, not medical advice — ask your doctor or midwife.
Agarikon is a large, pale, hoof-shaped bracket fungus that grows on old larch and other conifers. Its scientific name is Laricifomes officinalis. In Norway it is called lerkekjuke, and in Sweden lärkticka.
It was once a pharmacy item across Europe, sold as a bitter powder or tincture. Scandinavian folk healers used it for coughs, chest illness and heavy sweating. It was also used as a harsh laxative.
The honest verdict on evidence: there are no good human trials of agarikon. Long use in tradition is not proof that it works, and it is not proof that it is safe. Almost everything written about its action comes from test tubes.
Two practical points shape this page. The bitter compounds in the wild fungus can purge the gut hard. The wild fungus is also rare, and it is protected in several European countries.
Nobody has shown how agarikon acts in the human body. What follows is laboratory work, not proof of benefit in people.
In test tubes, extracts slow the growth of some bacteria. That includes the germ that causes tuberculosis. Cell studies also report activity against some flu and pox viruses.
Whether any of this happens inside a person is unknown. A compound that kills a microbe in a dish often fails in the body.
Agaric acid, the main bitter compound, is a known gut irritant. In animals it pulls water into the bowel, which causes purging. Lab work also suggests it blocks a transport step inside cell power plants (mitochondria).
Older doctors used it to cut night sweats in lung disease. The idea was that it damps the signals to sweat glands. That use rested on bedside habit, not on trials.
Mushroom beta-glucans are often said to "boost immunity". In lab and animal studies they can stir immune cells. No human trial shows that agarikon does this in you.
Most agarikon sold today is capsules or powder made from farmed mycelium. Mycelium is the root-like part of the fungus, often grown on rice or oats.
Dried fruiting body is also sold, in chunks or as a ground powder. It is woody and very bitter. Some sellers offer a tincture, which is an alcohol extract taken in drops.
Hot water extracts are common, often sold as "dual extract" when alcohol is used as well. A few blends mix agarikon with reishi, chaga or turkey tail.
Labels rarely state how much agaric acid or beta-glucan is present. Strength between brands is not comparable. Treat any "equivalent to" figure on a label with care.
Greek and Roman writers prized agarikon for chest illness and for purging. Dioscorides described it in the first century. European pharmacies stocked it for many centuries after that.
In Scandinavia the bracket was cut from old conifers and dried. Folk healers used it for coughs, wasting illness and drenching sweats. It was also given as a strong purge.
Into the early twentieth century, agaric acid was an official drug for night sweats in tuberculosis. Doses were small and measured out by a pharmacist. It faded from use as modern drugs arrived.
Today the fungus is scarce across much of Europe. It is red-listed or protected in several countries, including parts of Scandinavia.
Stop taking it and see a doctor if you get vomiting or diarrhoea that lasts more than a day. Also stop for blood in your stool, severe cramps, or dizziness on standing.
Seek urgent care for yellow skin or eyes, dark urine, or severe stomach pain. These can signal liver trouble.
Call emergency services for swelling of the lips or throat, a spreading rash, or trouble breathing.
See a doctor rather than self-treating if you have a cough lasting more than three weeks, cough up blood, run a fever, sweat through the night, or lose weight without trying.
In the United States it is sold as a dietary supplement and is not approved as a medicine. In the UK and EU it is sold as a food supplement, with no approved health claims.
The wild fungus is rare and is protected or red-listed in several European countries. Picking it may be illegal where you live.
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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