Quality, Purity & Potency
How to assess supplements before they ever reach your cart.
Quick checklist:
- cGMP and third-party testing (ISO/IEC 17025 preferred)
- Clear lot/COA access; identity, purity, potency assays
- Stable/clinically-used form (e.g., magnesium glycinate vs oxide)
- Transparent excipients; allergen disclosures
- Reasonable dosing, realistic claims, and recall history
What labs test for
Identity (correct species/compound), contaminants (heavy metals, microbes), adulterants, and active-constituent potency.
Where to dig deeper
- Monographs & safety: NaturalHerbLibrary.com
- Forms/brands & COA practices: SupplementsApothecary.com