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Head-to-head evidence comparison — which supplement is right for you?
UC-II vs White Willow Bark: White Willow Bark has the stronger overall evidence (6 vs 5/10); 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.
White Willow Bark wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Likely helps
4 of 4 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both UC-II and White Willow Bark have evidence — compare verdict strength side-by-side.
40mg UC-II daily (providing ~10mg undenatured type II collagen)
any
Undenatured type II collagen (UC-II, 40mg)
120-240mg salicin daily (from standardized extract)
With meals, Divided doses
Standardized extract (15% salicin)
8-24 weeks
8-16 weeks
Throughout use
1-2 weeks
1-4 weeks
Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study.
Nutr J (2016) · Rct · n=191
UC-II 40mg/day improved total WOMAC vs placebo over 180 days
Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial.
Int J Med Sci (2009) · Rct · n=52
UC-II reduced WOMAC 33% vs 14% for glucosamine+chondroitin
Undenatured type II collagen (UC-II(R)) for joint support: a randomized, double-blind, placebo-controlled study in healthy volunteers.
J Int Soc Sports Nutr (2013) · Rct · n=55
Improved average knee extension range vs placebo
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
All studies investigated ethanolic extracts with daily doses up to 240 mg salicin over periods of up to six weeks.
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.
Based on Cochrane review showing dose-response relationship with 240mg more effective than 120mg. Studies limited to 6 weeks duration. Requires salicin-standardized extract.
AI-estimated from published studies. Interpret as directional guidance.
White Willow Bark has a higher evidence score (6/10 vs 5/10) and wins in 2 of 3 categories.
For joint health & mobility, White Willow Bark has a higher relevance score (88 vs 65).
No known interactions between UC-II and White Willow Bark have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.