Educational information, not medical advice — ask your doctor or midwife.
Goat willow is a small tree of Scandinavia and northern Europe. Its inner bark was a folk remedy for pain, fever and stiff joints. In Sweden it is sälg, in Norway selje, in Finland raita.
The bark holds salicin. Your body turns salicin into salicylic acid, the same active compound that aspirin makes. That shared chemistry is why willow bark is often called a plant aspirin.
Here is the honest verdict. The human trials on willow bark used other willow species, mainly white willow. Goat willow itself has almost no testing in people.
Long use in a tradition is not proof that something works. It is not proof that it is safe either.
Salicin is the part that matters most. Gut bacteria and your liver change it into salicylic acid.
In lab studies, salicylic acid blocks enzymes called COX. These enzymes help make pain and swelling signals. That is the proposed route for any pain effect.
The salicin in a normal bark dose is small next to a standard aspirin tablet. Some researchers think other bark compounds add to the effect. That idea rests on lab work and is not settled in people.
Goat willow bark has not been studied as closely as white willow. Its salicin level shifts with the tree, the season and the harvest. So the strength of any given bark is hard to predict.
Goat willow bark is sold mainly as dried cut bark and as capsules or tablets of extract.
Loose bark is used to brew a bitter tea. Alcohol tinctures are also on sale.
Most shop products are labelled simply "willow bark". They usually contain white willow (Salix alba) or purple willow (Salix purpurea). Goat willow is uncommon in trade.
Better labels state the salicin amount per dose. Many do not. Bark stripped from a wild tree carries no such number at all.
Willow bark was a standard home remedy across the Nordic countries. People chewed or boiled the inner bark for aches, fever and sore joints.
Goat willow grew almost everywhere and was easy to reach. It was often simply the willow at hand. Its spring catkins also marked the turn of the season and were cut for Palm Sunday branches.
The wider European reputation of willow fed into early chemistry. Salicin was isolated from willow in the 1820s. Aspirin reached the market in 1899.
These records tell us what people did. They do not tell us whether the bark helped them.
Stop and get emergency help if you have black tarry stools, vomit that looks like blood or coffee grounds, or swelling of the face, lips or throat. Sudden wheezing or trouble breathing also needs emergency care.
Stop and call a doctor if you get ringing in your ears, a skin rash, unusual bruising, or stomach pain that keeps coming back.
See a doctor anyway if pain has not improved after about a week. Also see one if a fever lasts more than three days, or if back pain comes with numbness, leg weakness or loss of bladder control.
In the European Union and the UK, willow bark is sold both as a registered traditional herbal medicine and as a food supplement. Most registered products use white willow rather than goat willow.
In the United States it is sold as a dietary supplement. It is not approved there as a drug for any condition.
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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