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Independent lab verification that a supplement matches its label and is free of meaningful contaminants.
Because supplements are not FDA-approved before sale, third-party testing by independent labs (programs such as NSF, USP, and Informed Sport) is a key quality signal: it verifies the product contains what the label claims, at the stated dose, without meaningful contaminants or banned substances. It does not prove the ingredient works — only that the bottle is what it says.