White Willow
Quick Facts
- What it is: The bark of the white willow tree, used as a herbal pain and fever remedy and the source of salicin, a natural relative of aspirin.
- Main uses: Low back pain, Joint pain, General aches, Fever (traditional use)
- Active ingredients: Salicin, Salicortin, Tremulacin, Flavonoids, Tannins
- Forms: Standardised extract tablets, Capsules of powdered bark, Dried bark for tea, Tincture
- Time to effect: Hours to about a week, and it may do nothing.
- Side effects: Stomach upset is common; bleeding and allergic reactions are uncommon but serious.
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What is White Willow?
White willow is the dried bark of the white willow tree, Salix alba. It is sold as a herbal remedy for pain, fever and stiff joints. Its main compound, salicin, is a natural cousin of aspirin.
American folk healers and 19th-century Eclectic doctors used the bark for fevers, headaches and aching joints. Similar use goes back thousands of years in Europe and the Middle East. Long use does not prove that a remedy works, and it does not prove that it is safe.
The short verdict on evidence: a few small human trials suggest modest, short-term relief of low back pain. Support for other uses is thin. Because it acts like aspirin, many people should not take it at all.
How does White Willow work?
Willow bark works mainly through salicin, an aspirin-like plant compound.
In people, the gut and liver turn salicin into salicylic acid. That is the same active form aspirin becomes. This step is well documented in human studies.
In laboratory work, salicylic acid blocks COX enzymes (proteins that make pain and swelling signals). This is the usual explanation for pain relief. How much of it happens after a dose of bark extract is not fully mapped.
The bark also holds polyphenols and tannins (bitter plant compounds). In cell and animal studies these appear to calm inflammation. Whether they add anything in people is unknown.
One likely difference from aspirin: willow bark seems to have a weaker effect on platelets (blood cells that help clots form). This has been seen in small studies. It does not remove the bleeding risk.
What forms does White Willow come in?
Most research used capsules or tablets of bark extract set to a fixed salicin amount.
Common forms on sale: - dried cut bark for tea or a simmered decoction - powdered bark in capsules - standardised dry extract tablets, labelled by salicin content - liquid tinctures made with alcohol - blended joint or back formulas that mix willow with other herbs
Bark tea is weak and very bitter. The amount of salicin in a cup is hard to judge. Tincture strength varies with the maker.
Standardised extracts are the most consistent choice. Their labels state salicin per dose. Blended products often hide how much willow bark you actually get.
Where it comes from:
Willow bark was used as a pain and fever remedy for thousands of years.
Writings from ancient Greece and Egypt described willow for aches and fevers. European village medicine used bark teas in much the same way.
In 19th-century America, Eclectic doctors listed willow bark as a bitter tonic and fever remedy. It also appeared in home medical guides of that era.
Chemists isolated salicin from willow in 1828. That work led to salicylic acid, and then to aspirin in 1899. Aspirin soon replaced the bark in regular medical practice.
Who should avoid White Willow?
- Never give willow bark to a child or teenager with a fever, flu or chickenpox. Aspirin-like compounds are linked to Reye's syndrome (a rare but often deadly brain and liver illness).
- Do not use if you are allergic to aspirin or other salicylates.
- Do not use if your asthma gets worse after aspirin or ibuprofen.
- Do not use if you take warfarin, heparin, clopidogrel or any other blood thinner.
- Do not use if you take aspirin, ibuprofen, naproxen or another NSAID painkiller (anti-inflammatory pain drug).
- Do not use if you have a peptic ulcer (a sore in the stomach lining) or have had bleeding in the stomach or gut.
- Do not use if you have a bleeding disorder such as haemophilia.
- Do not use if you have kidney disease or liver disease.
- Do not use if you are pregnant or breastfeeding.
- Do not use if you take methotrexate or lithium.
- Avoid it for at least two weeks before any planned surgery, including dental surgery.
- Do not use if you have gout, unless your own doctor agrees.
When should you see a doctor?
Stop taking it and get emergency care if you have: - black, tarry stools, or blood in your stools - vomit with blood or dark grains like coffee grounds - swelling of the face, lips or tongue, or trouble breathing - a sudden widespread rash
Stop and call your doctor if you notice: - ringing in your ears or hearing changes - stomach pain, heartburn that will not settle, or nausea - easy bruising, nosebleeds or cuts that keep bleeding - less urine than usual, or swollen ankles
Also see a doctor if your pain has not eased after one to two weeks. See one sooner if a fever lasts more than three days, or if back pain comes with numbness, weakness or loss of bladder control.
Is White Willow legal where you live?
In the United States, willow bark is sold as a dietary supplement, not as an approved drug. In the UK and EU, some products are registered as traditional herbal medicines, and Germany's Commission E listed the bark for pain and fever.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
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