Product Selection Guide · 04 of 04
Independent Laboratory Testing — Why It Matters
Without independent testing, you're relying entirely on the manufacturer to tell you what's in their product. Third-party certification is the closest thing the supplement industry has to an objective quality signal.
What third-party testing actually checks
A credible third-party certification confirms three things: the product contains the ingredients it claims, at the listed amounts, and without contaminants (heavy metals, pathogens, banned substances or undeclared ingredients).
Full article in development — including how to verify a certification is current, what each scheme tests for and limitations to be aware of.
Key certification bodies
NSF International
One of the most rigorous certifications. Tests for label accuracy, contaminants and banned substances.
US-based, globally recognised
USP (United States Pharmacopeia)
Focuses on ingredient identity, potency, purity and product performance. Longstanding credibility.
US-based
Informed Sport
Specifically tests for WADA-banned substances. Preferred by athletes and sports professionals.
UK-based, globally used
Consumerlab
Independent testing organisation that publishes comparative results across brands. Subscription-based but widely available.
US-based