Why does third-party testing matter for supplements?

Unlike prescription drugs, supplements generally aren't pre-approved for quality, so independent testing fills the gap between label and reality.

What testing verifies

• Identity: the ingredient is actually what's claimed.
• Potency: the dose matches the label.
• Purity: screened for heavy metals, microbes and contaminants.

This matters because adulteration and underdosing are common — fake NMN, mislabelled collagen and "private label" mystery products all come up in community threads. Notably, even Amazon now requires supplement sellers to provide testing results and documentation to list their products, a sign of how widespread quality concerns are. When a brand publishes a Certificate of Analysis, that's the assurance you're paying for.

This information is educational and is not medical advice. Dietary supplements are not intended to diagnose, treat, cure or prevent any disease, and these statements have not been evaluated by the FDA. Talk to a qualified healthcare professional before starting any supplement, especially if you are pregnant, nursing, taking medication or managing a health condition.