White Willow Bark
Salix alba
TL;DR
Willow bark is a slow-release natural salicylate — it works modestly for back and joint pain, but it carries aspirin-like risks and the doses that work require standardized extracts, not tea.
Ideal For
- Chronic low back pain in adults who tolerate salicylates
- People wanting an NSAID alternative with a milder gastric profile
Avoid If
- You are allergic to aspirin or take anticoagulants
- The user is a child with a fever
Frequently Asked Questions
Overview
Salicin from willow bark is hydrolysed by gut flora and hepatic metabolism into salicylic acid, the same active metabolite aspirin produces. The pharmacology differs in useful ways: conversion is slower, plasma peaks are lower and later, and willow bark does not irreversibly acetylate platelet COX-1, so antiplatelet effects are weaker. This explains the better gastric tolerability reported in trials. Randomized studies of extracts standardized to 120-240 mg salicin per day have shown pain reduction in chronic low back pain, with the higher dose clearly outperforming placebo, and smaller studies suggest benefit in osteoarthritis of the knee and hip. Willow bark extract also contains polyphenols and flavonoids that may contribute independently, since the salicin content alone does not fully account for effect size. The important caution is that it is still a salicylate: aspirin allergy, anticoagulation, pediatric fever with viral illness (Reye syndrome concern) and peptic ulcer are all genuine contraindications.
How It Works
- Salicin is metabolized to salicylic acid, inhibiting COX-mediated prostaglandin synthesis
- Polyphenols and flavonoids add antioxidant and cytokine-modulating activity
- Slower conversion yields lower peak salicylate levels than aspirin, reducing gastric irritation
Quick Facts
- 240 mg salicin/day beat placebo for low back pain; 120 mg was borderline
- Willow bark tea delivers far too little salicin to be therapeutic
- Still a salicylate — the aspirin contraindications all apply
Benefits & Outcomes
No linked outcomes yet. Research is ongoing.
Supporting Research8 studies
The effect of Salix alba L. bark extract on dark circles in vitro and in vivo
Jeon S
Salix alba (white willow) bark extract inhibited melanin synthesis and inflammatory markers in vitro, and in 29 volunteers an 8-week topical application modestly lightened infraorbital dark circles and improved skin brightness measurements versus baseline.
Herbal medicine for low-back pain
Oltean H, Robbins C, van Tulder MW +3 more
Salix alba showed moderate evidence of short-term pain reduction versus placebo, with adverse events comparable to or milder than NSAIDs.
Herbal Medicine for Low Back Pain: A Cochrane Review
Gagnier JJ, Oltean H, van Tulder MW +2 more
Fourteen RCTs (2050 participants) were included.
Treatment of low back pain exacerbations with willow bark extract: a randomized double-blind study
Chrubasik S, Eisenberg E, Balan E +3 more
39% of patients receiving 240 mg salicin were pain-free in the last week versus 6% on placebo.
A systematic review on the effectiveness of willow bark for musculoskeletal pain
Vlachojannis JE, Cameron M, Chrubasik S
Evidence was moderate for low back pain at higher salicin doses and inconsistent for osteoarthritis.
Efficacy and safety of willow bark extract in the treatment of osteoarthritis and rheumatoid arthritis: results of 2 randomized double-blind controlled trials
Biegert C, Wagner I, Ludtke R +5 more
Willow bark extract did not differ significantly from placebo on WOMAC pain in osteoarthritis or on disease activity in rheumatoid arthritis.
Efficacy and tolerability of a standardized willow bark extract in patients with osteoarthritis: randomized placebo-controlled, double blind clinical trial
Schmid B, Ludtke R, Selbmann HK +4 more
WOMAC pain scores fell 14% with willow bark versus 2% with placebo.
Efficacy and safety of white willow bark (Salix alba) extracts
Shara M, Stohs SJ
Salicin is metabolised to salicylic acid with weak COX inhibition, and adverse events are generally mild although salicylate cautions apply.
Safety Information
Potential Side Effects
Gastrointestinal upset, occasional allergic skin reaction. Tinnitus at excessive doses. Bleeding risk is lower than aspirin but not absent.
Contraindications
Aspirin or salicylate allergy, peptic ulcer disease, anticoagulant therapy, children with fever or viral illness, third-trimester pregnancy, severe kidney or liver disease.
Drug Interactions
- Warfarin and other anticoagulants
- NSAIDs — additive gastric and renal risk
- Methotrexate — salicylates reduce clearance
Pregnancy & Breastfeeding
Pregnancy: likely_unsafe
Breastfeeding: likely_unsafe
Dosage Guidelines
Dosage Used in Studies
Consult healthcare provider
Best Time to Take
Split morning and evening
Best Form
Extract standardized to salicin content
Bioavailability
Salicin requires gut bacterial hydrolysis; peak salicylate concentrations occur roughly 2 hours later than with aspirin
Forms Compared
The only form with trial support; dose by salicin content
Salicin content variable and usually subtherapeutic
Food & Timing
With food to minimize gastric upset
Medical Disclaimer
The information provided on this website is for educational and informational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or before starting any supplement regimen.
Individual results may vary. The statements on this website have not been evaluated by the Food and Drug Administration. Products and information are not intended to diagnose, treat, cure, or prevent any disease.