What is Tamarac?

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.

How does Tamarac work?

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.

What forms does Tamarac come in?

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.

Where it comes from:

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.

What does Tamarac help with?

• Coughs and chest congestion: This was the most common use. Bark tea and bark syrup were given for winter coughs and long chest trouble. In laboratory tests, turpentine-type oils can thin mucus and slow some germs. No trial has tested tamarac on a human cough. A warm drink alone soothes a throat, and that may explain part of the old praise.
• Sore throat and loose bowels: Folk users gargled the tea or drank it for runny stools. The bark is high in tannins, which dry and tighten tissue in test-tube work. That effect is real in a dish. It has not been measured in a person's throat or gut. Lasting diarrhoea needs a doctor, not bark tea.
• Skin sores, used on the skin: Bark poultices and washes were laid on wounds, boils and itchy patches. Resin from larch has been used on skin across many northern cultures. Laboratory work shows some conifer resins slow bacteria. Whether a home wash helps a real wound is untested. Resin also causes a red itchy rash in some people.
• Fluid buildup and swelling: Old texts said the bark made people pass more urine, so it was given for swollen legs and belly. This claim has never been tested. Swelling can signal heart, kidney or liver disease. That is a reason to see a doctor quickly, not to self-treat.
• Jaundice and liver complaints: Eclectic writers listed tamarac for jaundice, which is yellow skin and eyes. There is no human or animal evidence behind this. Jaundice always needs medical testing. Treating it at home can delay care for a serious cause.
• General weakness, as a bitter tonic: The bark was given to people seen as run down, often with other barks in a blend. "Tonic" was a loose term of that era. Nothing has been shown to lift energy or appetite in a trial. Ongoing tiredness deserves a check for anaemia, thyroid trouble and other causes.

What are the side effects of Tamarac?

• Nausea or stomach ache, mostly on an empty stomach
• A dry, puckered feeling in the mouth
• Constipation, or in some people looser stools
• Red itchy skin rash from the resin, on contact
• Lower iron uptake with heavy, long use
• Allergic reaction in people sensitive to conifer trees

Good to know:

Side effects are poorly recorded, because the plant has never been studied in a trial. Most of what we have is old case notes and anecdote.

Stomach upset is the complaint reported most. It is usually mild and fades when you stop.

The serious risk is an allergic reaction. Swelling of the lips or tongue, hives or trouble breathing means stop at once and seek emergency care.

How much Tamarac should you take?

• Recommended daily: There is no agreed amount for tamarac bark, because no trial has set one. Products are rare, and labels differ a lot. Bark tea blends often suggest about one to two cups a day. Tincture labels often list a small number of drops in water, once or twice a day. Those figures are what labels carry. They are not advice for you. Follow the label on the exact product you hold, and ask a pharmacist or doctor before you start.
• Best time of day: Time of day does not matter much. The tea is bitter and warming, so many people take it in the evening. If a dose upsets your stomach, shift it to a mealtime instead.
• With or without food: Take it with food or just after a meal. Tannins can turn the stomach on an empty gut. Keep it well away from iron pills. Leave at least two hours between the two.
• Time to effect: Honestly, it may do nothing at all. No trial has measured any effect in people. If a warm tea soothes your throat, you feel that within minutes. Any claimed effect on a cough or skin would be judged over days. If nothing changes in about a week, stop.
• How long to take it: Short-term use is all the record supports. Folk use was a matter of days or a few weeks during an illness. Nothing is known about months of daily use. Tannin-rich teas taken long term may lower iron uptake. If a cough or skin problem lasts past two or three weeks, stop and get it checked.