Nutrition
NSF Certified for Sport Mark
NSF Certified for Sport verifies label claims and banned-substance screens per product—it is a safety mark, not proof a supplement works.
The NSF Certified for Sport mark means an independent lab tested a specific product lot for label accuracy, banned-substance screens, and contaminant limits athletes care about—not a blanket brand promise. Look for the blue NSF seal on the tub or bottle and match the listed product name to what you bought; certification is per formula and flavor.
It verifies safety baselines, not whether creatine or caffeine will make you faster.
Common questions
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Does NSF certification mean a supplement is effective?
No—it checks identity, dose honesty, and sport-relevant contaminant screens. Efficacy still depends on evidence tiers and your logged training response.
Related terms
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