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Head-to-head evidence comparison — which supplement is right for you?
Glucosamine vs UC-II: Glucosamine has the stronger overall evidence (5.5 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.
Glucosamine wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Probably helps
2 of 3 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (1)
Outcomes where both Glucosamine and UC-II have evidence — compare verdict strength side-by-side.
1500mg glucosamine sulfate
With food, Once daily or split into 3 doses
Glucosamine sulfate (most studied)
40mg UC-II daily (providing ~10mg undenatured type II collagen)
Any time of day
Undenatured type II collagen (UC-II, 40mg)
4-12 weeks
8-12 weeks
6-12 months
8-24 weeks
8-16 weeks
Throughout use
Chondroitin for osteoarthritis
The Cochrane database of systematic reviews (2015) · Meta analysis · n=9110
9,110 is the total: "Forty-three randomized controlled trials including 4,962 participants treated with chondroitin and 4,148 participants given placebo or another control". The 4,962 figure is the treatment arm alone.
The Safety and Efficacy of Glucosamine and/or Chondroitin in Humans: A Systematic Review
Nutrients (2025) · Systematic review · n=146
Of the 2013 articles screened, 146 studies were included in our review, with nearly 60% being randomized controlled trials and most conducted in Europe, Asia, or the U.S.
Efficacy and safety of the combination of glucosamine and chondroitin for knee osteoarthritis: a systematic review and meta-analysis
Archives of orthopaedic and trauma surgery (2023) · Meta analysis · n=3793
Our study confirmed that the combination of glucosamine and chondroitin is effective and superior to other treatments in knee osteoarthritis to a certain extent.
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
Multicentre randomised, double-blind trial in 191 people with knee osteoarthritis: UC-II 40 mg/day, glucosamine 1500 mg plus chondroitin 1200 mg, or placebo for 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
90-day trial comparing UC-II with glucosamine plus chondroitin in knee osteoarthritis, with no placebo group
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
Randomised, double-blind, placebo-controlled 120-day trial in 55 healthy people with knee discomfort only on exertion: UC-II 40 mg/day (n = 27) or placebo (n = 28)
Glucosamine has a higher evidence score (5.5/10 vs 5/10) and wins in 2 of 3 categories.
For joint health & mobility, Glucosamine has a higher relevance score (88 vs 65).
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.