Educational information, not medical advice — ask your doctor or midwife.
White birch is a tall tree with papery white bark. Its leaves, bark and spring sap have all been used as folk remedies. The old name Betula alba covers two European trees, Betula pendula and Betula pubescens.
In North America, 'canoe birch' usually means paper birch, Betula papyrifera. American folk and Eclectic healers used the local birches in much the same way. Most birch leaf sold today still comes from Europe.
Birch leaf tea is taken mainly to make you pass more urine. Long use is not proof that a remedy works, and it is not proof that it is safe.
The honest verdict: human trials of birch leaf are few, small and weak. One birch bark gel does have real trial support, but it is a prescription drug, not a tea.
No one has shown clearly how birch leaf works in people.
The leaf is rich in flavonoids, a group of plant pigments. Hyperoside and quercitrin are the best known. In animal studies, these appear to raise urine output.
The idea behind the folk use is a flushing effect. More water passes through the bladder and washes it out. That idea has not been tested well in people.
Birch leaf does not seem to push salt out of the body the way prescription water pills do. So it is not a swap for them.
The bark holds triterpenes, a class of plant fats. Betulin and betulinic acid are the main ones. In cell and animal tests, they appear to calm inflammation and help skin cells close over a wound.
That lab work led to a bark gel for a rare blistering skin disease. In that one product, the benefit has been measured in people.
Birch bark also holds salicylates, the aspirin-like compounds. The leaf holds very little. Whether birch eases joint pain in people has not been shown.
Birch products are not all alike, and the risks differ by form.
Leaf forms, the ones tied to the folk uses: - Dried leaf, loose or in tea bags - Tinctures and liquid leaf extracts - Capsules and tablets
Other forms: - Bottled birch sap, sold as birch water - Bark extract creams, salves and gels - Birch tar, used on the skin in old practice - Birch essential oil, used for scent and in rubs
Birch water is drunk as a plain beverage. Birch tar and birch essential oils are strong. They are meant for the skin or for scent, never to swallow.
A gel made from birch bark extract is a prescription medicine in the EU and the US. It is used on wounds in a rare inherited blistering disease. You cannot buy it as a supplement, and shop birch products are not the same thing.
Birch had a long run in both European and American folk practice.
European herbals listed the leaf as a spring cleansing tea. It was taken to make urine flow and to ease stiff joints. German health authorities later approved birch leaf tea for flushing the urinary tract, based largely on that long use.
Nineteenth-century Eclectic doctors in the United States used birch in a similar way. They described the bark as a bitter tonic. They applied birch tar to eczema, psoriasis and stubborn rashes.
Native peoples across the north used paper birch for canoes, baskets and shelter. Recorded medicinal uses included washes for sores and teas for coughs or stomach upset. Birch sap was tapped in spring and boiled down for food.
None of this history tells you how well birch works, or what a safe amount is for you.
Stop using birch and see a doctor if you get a rash, itching or swelling.
Get urgent care for swelling of the face, lips or tongue, or for trouble breathing. These can be signs of a severe allergic reaction.
See a doctor the same day if you have fever, chills, back or flank pain, or blood in your urine. Burning when you pass urine that lasts more than two days also needs checking.
Go to an emergency department if anyone swallows birch essential oil or birch tar oil, even a small amount.
In the United States, birch leaf is sold as a dietary supplement. It is not approved there as a medicine. In Germany and much of the EU, birch leaf tea is a registered traditional herbal medicine for flushing the urinary tract. Birch water is sold as an ordinary food or drink, and a birch bark gel is a prescription drug in both the EU and the US.
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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