What an out-of-specification result means
An out-of-specification result means a measured value fell outside what the label claims. This archive publishes the lots that read out of specification alongside the ones that passed. Here is what the term means, and why withholding those records would defeat the point of having them.
Last updated 2026-09-08
A specification is a range a result is supposed to fall inside. It usually comes from the label: a vial marked 60 mg at 99% purity is claiming two things, and each is a specification the laboratory can measure against. When a measured value falls outside one of them, the certificate says so — commonly as “out of specification”, sometimes abbreviated OOS.
The term describes conformance to a claim. It does not describe safety, and a certificate is not the kind of document that could. What it establishes is narrower and more useful: that on this batch, on this date, the material did not match what the label said about it.
One published lot read out of specification.
They are in the archive alongside everything else, with the laboratory's own wording intact — including where the laboratory goes on to argue the result was acceptable for research-grade material. That argument is the lab's, not ours. Removing these records would have been trivial and would have made every other one on the site worth less.
BPC-157
The sample COMPLIED with all established analytical specifications, except that the vial was underfilled relative to the labeled peptide content; therefore, it was out of specification (OOS). Peptide concentration was determined by UV absorbance using the Beer–Lambert law and verified by comparison to an analytical reference standard
Why this is the hardest thing to check about a supplier
Every vendor in this category publishes passing results. Failing ones are rare enough that we have not found another archive carrying one — and from the outside those two positions look identical, a page of certificates that all say pass. The difference is invisible precisely where it matters most.
There is no way to prove a negative here, and this page is not claiming to. What can be said is narrower: an archive containing a miss demonstrates that misses reach the archive. An archive containing none demonstrates nothing either way, and should be read as such.
Common questions
Does an out-of-specification result mean the material is unsafe?
No, and the certificate does not address safety at all. Out of specification means a measured value fell outside the range the label claims — a purity below the stated figure, or a vial holding less than it should. It is a statement about conformance to a claim, not about hazard.
Why publish a certificate that failed?
Because an archive in which every result passes carries no information. If failures are withheld, a reader cannot tell a vendor who tests rigorously from one who tests selectively, and every passing result loses the meaning it would otherwise have.
Who decides what the specification is?
The specification is the claim being tested against — usually the label. That is worth noticing, because a vendor who sets a low bar can report that everything passes while measuring exactly the same material as one who sets a high bar and publishes a miss.
For laboratory and research use only · Not for human or veterinary consumption · Not evaluated by the FDA