Remember, GLP tells you the study was witnessed — not that it was worth witnessing. Go break some eggs.
👀 The Read
GLP ≠ GOOD
It’s actually only the beginning…
Most teams see "GLP-compliant" on a report and exhale. The study is clean. The data is solid. FDA will be happy.
GLP tells you none of that. It tells you the study was documented — and a well-documented study can still be the wrong study, badly designed, and useless to your IND.
Here's what GLP actually is. Good Laboratory Practice is a regulation about record-keeping and traceability, not science. It governs whether every step was written down, every deviation logged, every instrument calibrated, every raw data point attributable to a person and a date. It exists so a reviewer can trust that what the report says happened is what actually happened. That's it. GLP is a chain of custody for data. It is not a judgment about whether the data is any good.
Which means all of this can be true at once: your study is fully GLP-compliant, and the wrong species was used, the doses were too low to reach a meaningful exposure, the endpoints didn't cover your compound's real liability, and the design answers a question FDA wasn't asking. Every box checked. Every signature in place. And the study still doesn't support your IND.
FDA sees this constantly. GLP compliance gets a study accepted into the review. It does not get the conclusions accepted. A reviewer will take a perfectly documented study and still tell you it doesn't establish safety — because compliance and adequacy are two different bars, and you only cleared the first one.
So when a CRO hands you a GLP report, the compliance is the floor, not the win. The real question isn't "was it GLP?" It's "was it the right study, run at the right exposures, measuring the right things?" GLP can't answer that. Only the design can.
Knowing a study is compliant is easy — it says so on the cover. Knowing whether it was the right study before you paid for it is a different problem entirely.
The Misconception: "GLP-compliant" means the study is good and FDA will accept the results.
The Correction: GLP governs documentation and traceability — not science quality. A GLP study can use the wrong species, wrong doses, or wrong endpoints and still be compliant. The real bar is adequacy — right study, right exposures, right endpoints. Only the study design can decide that.
⚙️ Module 2 is all about how GLP works ↓
The Complete Guide to Nonclinical Development - a fully online, go at your own pace, finally learn nonclinical, course. 12 modules + 2 bonus modules, and Module 2 is all about the GLP life. Check out the full syllabus and sign up for a Free Preview:
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