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Head-to-head evidence comparison — which supplement is right for you?
ASU vs White Willow Bark: ASU has the stronger overall evidence (5.5 vs 6/10); they're alternatives for joint health & mobility — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
ASU wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Mostly mechanism / observational
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both ASU and White Willow Bark have evidence — compare verdict strength side-by-side.
300mg ASU daily (standardized avocado:soybean unsaponifiables) (no cited trial states the dose it used, the cited papers are reviews and meta-analyses)
With meals
Standardized ASU (300mg)
120-240mg salicin daily (from standardized extract)
With meals, Divided doses
Standardized extract (15% salicin)
1-3 months
1-3 months
Throughout use
1-2 weeks
1-4 weeks
Efficacy and safety of avocado-soybean unsaponifiables for the treatment of hip and knee osteoarthritis: A systematic review and meta-analysis of randomized placebo-controlled trials.
Int J Rheum Dis (2019) · Meta analysis
A subanalysis according to the type of OA showed that ASU significantly decreased both VAS and Lequesne index in knee OA (WMD: -17.36, 95% CI: -25.91, -8.82; P < .0001 and WMD: -2.33, 95% CI: -2.88, -1.78; P < .00001, respectively) but not in hip OA.
Symptomatic efficacy of avocado-soybean unsaponifiables (ASU) in osteoarthritis (OA) patients: a meta-analysis of randomized controlled trials.
Osteoarthritis Cartilage (2008) · Meta analysis
Four trials were included, with 664 OA patients with either hip (41.4%) or knee (58.6%) OA allocated to either 300 mg ASU (336) or placebo (328).
Dietary supplements for treating osteoarthritis: a systematic review and meta-analysis.
Br J Sports Med (2018) · Meta analysis
Of 20 supplements investigated in 69 eligible studies, avocado soybean unsaponifiables revealed statistically significant improvements on pain, but were of unclear clinical importance.
Efficacy and Safety of White Willow Bark (Salix alba) Extracts
Phytotherapy research : PTR (2015) · Review
In recent years, various in vitro and animal studies have demonstrated that the anti-inflammatory activity of willow bark extract is associated with down regulation of the inflammatory mediators tumor necrosis factor-α and nuclear factor-kappa B.
A systematic review on the effectiveness of willow bark for musculoskeletal pain
Phytotherapy research : PTR (2009) · Systematic review
Seven manuscripts reporting four confirmatory and four exploratory trials.
The historical analysis of aspirin discovery, its relation to the willow tree and antiproliferative and anticancer potential
Cell proliferation (2006) · Review
For several millennia, the willow tree and salicin have been associated with salicylic acid, the key precursor molecule that has contributed to the discovery of acetylsalicylic acid, traded as aspirin.
The Cochrane review of herbal medicine for low back pain found that willow bark extract standardised to 120 or 240 mg salicin a day is probably better than placebo for short-term pain and rescue medication (two trials, 261 participants, moderate-quality evidence), with no significant adverse events (PMID 25536022). A systematic review of the same trials reports a dose-dependent analgesic effect, which is why 240 mg sits above 120 mg, with all studies at up to 240 mg salicin for up to 6 weeks and only minor adverse events (PMID 19140170). A general musculoskeletal pain curve was removed: in osteoarthritis the trials conflict, including a 2-week trial at 240 mg with a moderate effect (PMID 11406860), and no cited trial tested a second dose.
AI-estimated from published studies. Interpret as directional guidance.
ASU has a higher evidence score (5.5/10 vs 6/10) and wins in 2 of 3 categories.
For joint health & mobility, White Willow Bark has a higher relevance score (88 vs 60).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.