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UC-II (Undenatured Type II Collagen) Side Effects & Safety

Evidence:Moderate
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This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Safety Profile

Overall safety rating: Generally Safe

Potential Side Effects

  • Very well tolerated at 40mg daily
  • Mild GI discomfort (rare)
  • Headache (rare)
  • No serious adverse events reported in clinical trials

Drug & Supplement Interactions

  • Immunosuppressant drugs — UC-II works through immune modulation; theoretical interaction with immunosuppressive therapy
  • No significant interactions reported in clinical studies

Maximum Dose

Do not exceed: 40mg daily is the studied dose; higher doses have not shown additional benefit and may impair oral tolerance

Full UC-II (Undenatured Type II Collagen) Guide

References

  1. RCTLugo JP, Saiber ZM, Yao X, et al. (2013). Undenatured type II collagen (UC-II) for joint support: a randomized, double-blind, placebo-controlled study in healthy volunteers. Journal of the International Society of Sports Nutrition. DOI PubMed
  2. RCTLugo JP, Saiber ZM, Lai JN, et al. (2016). Efficacy and tolerability of an undenatured type II collagen supplement in modulating knee osteoarthritis symptoms: a multicenter randomized, double-blind, placebo-controlled study. Nutrition Journal. DOI PubMed
  3. RCTCrowley DC, Lau FC, Sharma P, et al. (2009). Safety and efficacy of undenatured type II collagen in the treatment of osteoarthritis of the knee: a clinical trial. International Journal of Medical Sciences. DOI PubMed
  4. RCTSchön C, Knaub K, Alt W, Durkee S, et al. (2022). UC-II Undenatured Type II Collagen for Knee Joint Flexibility: A Multicenter, Randomized, Double-Blind, Placebo-Controlled Clinical Study.. Journal of integrative and complementary medicine. DOI PubMed