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White Willow Bark

traditional pain and fever relief

herb
Human trial evidenceTraditional useInteraction riskNeeds more research

Natural salicin source for pain and inflammation.

White willow bark, derived from several species of willow trees (Salix species), has a long history of use in traditional medicine for pain and fever. It contains salicin, a compound structurally similar to aspirin (acetylsalicylic acid). Upon ingestion, salicin is metabolized in the body to salicylic acid, which is believed to be responsible for its therapeutic effects. While often associated with pain relief, its efficacy and safety profile differ from synthetic aspirin. The use of white willow bark predates the synthesis of aspirin and represents an early example of natural compounds inspiring modern pharmaceuticals.

Quick answer

What it is: White willow bark, derived from several species of willow trees (Salix species), has a long history of use in traditional medicine for pain and fever.

May support:Joint Pain, Chronic Back Pain, Osteoarthritis, Plantar Fasciitis, Psoriatic Arthritis, Tendinitis, Herniated Disc, Rheumatoid Arthritis, Sciatica, Ankylosing Spondylitis

Evidence Summary

The current evidence grade is considered low due to the absence of specific PubMed studies provided for this request. While white willow bark has a long history of traditional use and its active compound, salicin, has a known mechanism of action, robust clinical trials specifically on standardized white willow bark extracts are needed to establish efficacy and safety for specific conditions.

Last reviewed · Jun 2026

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Why It Works

Converts to salicylic acid; COX inhibition.

How it works in more detail

The primary active compound, salicin, is a phenolic glycoside. After oral ingestion, salicin is hydrolyzed in the gut by intestinal bacteria to saligenin (salicyl alcohol). Saligenin is then oxidized in the liver and other tissues to salicylic acid. Salicylic acid is known to inhibit cyclooxygenase (COX) enzymes (COX-1 and COX-2), which are responsible for the synthesis of prostaglandins. Prostaglandins are lipid compounds that play a key role in mediating pain, inflammation, and fever. By inhibiting their production, white willow bark may exert its analgesic, anti-inflammatory, and antipyretic effects. However, the exact pharmacokinetic and pharmacodynamic profile of white willow bark extracts, which contain various other compounds besides salicin, may differ from that of pure salicylic acid or aspirin.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
240 mg salicin/day
Research dosage range
Research dosages have varied widely, often targeting a daily intake of 60 mg to 240 mg of salicin, sometimes up to 480 mg of salicin, in various extract forms.
Typical onset
The onset of effects for white willow bark is generally slower than that of synthetic aspirin, often taking several hours to a day to become noticeable due to the metabolic conversion of salicin to sa
Typical forms
Capsule, Tablet, Liquid extract, Tea
Quality markers
Look for standardized extracts that specify the percentage or amount of salicin per dose. Reputable brands often provide third-party testing for purity and potency. Ensure the product is free from contaminants and unnecessary fillers.
Medication interactions
  • Anticoagulants (blood thinners)
  • NSAIDs (non-steroidal anti-inflammatory drugs)
  • Methotrexate
  • Diuretics
  • Beta-blockers
Avoid if
  • Allergy to aspirin or salicylates
  • Asthma (especially aspirin-exacerbated respiratory disease)
  • Bleeding disorders
  • Stomach ulcers
  • Kidney disease
  • Pregnancy
  • Breastfeeding
  • Children and adolescents with viral infections (due to Reye's syndrome risk)

Community tips

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Suggested dosage

240 mg salicin/day

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Salicin, salicortin, tremulacin, populin, flavonoids (e.g., quercetin, luteolin), tannins.

Traditional use

The use of willow bark for pain and fever dates back thousands of years. Ancient Egyptians, Sumerians, and Assyrians used willow bark for its medicinal properties. Hippocrates, in the 5th century BC, recommended chewing on willow bark to relieve pain and fever. Native American tribes also utilized various willow species for similar purposes. This traditional knowledge eventually led to the isolation of salicin in the 19th century and subsequently the synthesis of aspirin.

Safety

Safety warnings

Aspirin-like risks; avoid in children.

Avoid if

  • Allergy to aspirin or salicylates
  • Asthma (especially aspirin-exacerbated respiratory disease)
  • Bleeding disorders
  • Stomach ulcers
  • Kidney disease
  • Pregnancy
  • Breastfeeding
  • Children and adolescents with viral infections (due to Reye's syndrome risk)

Medication interactions

  • Anticoagulants (blood thinners)
  • NSAIDs (non-steroidal anti-inflammatory drugs)
  • Methotrexate
  • Diuretics
  • Beta-blockers

Reported side effects

  • Gastrointestinal upset
  • Nausea
  • Heartburn
  • Allergic reactions (rash, itching)

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade

The current evidence grade is considered low due to the absence of specific PubMed studies provided for this request. While white willow bark has a long history of traditional use and its active compound, salicin, has a known mechanism of action, robust clinical trials specifically on standardized white willow bark extracts are needed to establish efficacy and safety for specific conditions.

Clinical Trial Registries(5)

Registered ongoing or completed trials (ClinicalTrials.gov).

Moderate Quality

Limitations: A significant limitation is the lack of recent, high-quality, placebo-controlled clinical trials specifically evaluating standardized white willow bark extracts for various conditions. Many studies may be older, have small sample sizes, or use non-standardized preparations, making it difficult to draw definitive conclusions. The absence of specific studies in the provided prompt further highlights this evidence gap.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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