Glucosamine has no side effects because it's natural
8.0Strong
evidence
evidence
The Claim
Many consumers assume that because glucosamine is derived from natural sources, it is completely free of side effects.
Origin
This belief stems from the common narrative that natural products are inherently safer than synthetic ones, a notion reinforced by many supplement manufacturers.
What Science Says
While glucosamine is generally well-tolerated, studies indicate that it can cause mild side effects such as gastrointestinal discomfort, headaches, and skin reactions. A review in 2018 suggested that while serious side effects are rare, the assumption of complete safety is unfounded.
Verdict
False
Sources
- PMID:37489348 Effectiveness and Safety of Glucosamine in Osteoarthritis: A Systematic Review.
- PMID:15621331 Glucosamine effects in humans: a review of effects on glucose metabolism, side effects, safety considerations and efficacy.
- PMID:40647198 The Safety and Efficacy of Glucosamine and/or Chondroitin in Humans: A Systematic Review.