Reading a Supplement Label: What “Third-Party Tested” Really Means
"Third-party tested" sounds reassuring on a label, but the phrase alone doesn't tell you what was actually tested for, or how rigorously.
What certifications actually check
NSF Certified for Sport and Informed Sport both screen for banned substances relevant to competitive athletes, useful if you're tested, but not the same as a general purity or heavy-metal screen.
What to look for instead
A batch-specific certificate of analysis (COA) you can look up online is a stronger signal than a certification logo alone, since it ties directly to the exact tub you're holding.
The bottom line
A logo is a starting point, not a guarantee. Check what it actually covers before assuming it answers every safety question.
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