Educational information, not medical advice — ask your doctor or midwife.
Tamarac is the bark of the American larch tree, Larix americana (now usually called Larix laricina). It is also known as hackmatack or epinette rouge. Folk healers brewed the inner bark into a tea or a syrup.
The tree grows in cold bogs and wet woods across Canada and the northern United States. It is a conifer that drops its needles each autumn. The inner bark is reddish, bitter and sticky with resin.
Here is the honest verdict up front. There are no good human trials on tamarac bark. Long use in folk medicine is not proof that it works, and it is not proof that it is safe.
That point applies to every claim on this page, so it is made once here. Read the rest as tradition plus laboratory hints. Treat tamarac as a traditional remedy with unknown benefit.
No one has shown how tamarac works in people. What follows is a proposal, not a proven path.
The bark is rich in tannins (plant compounds that taste dry and bitter). In test tubes, tannins are astringent, meaning they tighten and dry surface tissue. Folk healers may have been using that puckering effect on sore throats and loose bowels.
The bark also holds resin and a scented oil of the turpentine type. In laboratory tests, oils of this kind slow some bacteria and loosen mucus. Whether that happens in a person's chest after a cup of tea is not established.
Larch wood is a source of arabinogalactan, a plant fibre. In cell studies and in a few small human studies, this fibre appears to feed gut bacteria and shift some immune markers. Most of that work used a different larch species and the wood, not tamarac bark.
Tamarac is a niche herb and can be hard to find. These are the forms you may meet:
- Dried shredded inner bark, simmered into a tea. - Alcohol tincture, sold in dropper bottles. - Cough syrups that list larch bark among several herbs.
You may also see:
- Salves and washes made for use on the skin. - Larch arabinogalactan powder, a fibre product from larch wood.
The fibre powder is not the same thing as bark. It usually comes from a western larch, not from tamarac.
Raw larch turpentine and pine-type essential oils are also sold. Those are not the bark remedy and must never be swallowed.
Tamarac has a long record in northern North American folk use. Several First Nations used the bark and needles for coughs, colds and wounds. Poultices of mashed bark were laid on sores and burns.
Settlers took up the same bark. Eclectic doctors of the 1800s listed it as a tonic for people who were thin and weak. They also gave it for long-running chest complaints.
Texts of that era claimed it helped jaundice (yellow skin and eyes), skin disease, and dropsy, their word for body swelling. It was also called a diuretic, meaning something that makes you pass more urine. Those uses were written as practice notes, not as test results, and none were checked by trials.
Stop and get urgent care if you have swelling of the lips, tongue or throat, hives, or trouble breathing.
See a doctor soon if you notice any of these:
- A cough that lasts more than three weeks, or coughing up blood. - Fever, chest pain or shortness of breath. - Yellow skin or yellow eyes. - New or growing swelling in your legs, ankles or belly. - A skin sore that spreads, weeps or will not heal. - Stomach pain, dark stools or lasting diarrhoea.
Stop taking it before any planned surgery and tell your care team.
In the United States, larch bark is sold as a dietary supplement. It is not approved as a drug, and no health claims may be made for it. In Canada, a natural health product must carry a licence number. It is not a controlled plant in either country.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
Reviewed by the HealisticMD editorial team How we grade evidence →
The published evidence for Tamarac is weak or absent. That usually means no controlled trial has tested it, not that a trial found it ineffective — the two are different, and we grade only what has been published.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
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