Abstract
Third-party testing places analysis with a laboratory independent of production. This article follows the workflow from sample submission to a verifiable report and identifies the elements that make independence meaningful.
The phrase third-party tested is common in research supply, and its meaning depends entirely on the process behind it. What matters is whether the analysis was performed by a laboratory with no interest in the outcome, and whether the resulting report can be verified without relying on the supplier.
The workflow
A representative sample is drawn from the finished batch and submitted to the analytical laboratory with the intended identity and quantity declared. The laboratory assigns its own reference number, runs the requested assays, and issues a report under that reference.
- Sample drawn from the batch that will actually be supplied
- Submission recorded with a laboratory-assigned reference number
- Analysis by defined, documented methods
- Report issued by the laboratory, not rewritten by the submitter
- Report retrievable from the laboratory using its reference
Why independent retrieval matters
A report that can only be obtained from the supplier requires the reader to trust the supplier. A report retrievable directly from the testing laboratory, using a reference printed on the document, allows the reader to confirm that the content has not been altered. This is the practical difference between a claim and a verifiable record.
Independence is demonstrated by verifiability, not by the wording of a marketing statement.
Scope of a typical report
Most reports address identity by mass spectrometry and purity by high performance liquid chromatography, with chromatograms and spectra appended. Additional determinations such as water content, residual solvents, or net peptide content may be requested where the intended application requires them. A report covers only what was requested; absence of a determination is not evidence about its result.
What independent testing does not establish
Analysis characterises the submitted sample. It does not certify a production process, guarantee the properties of other batches, or describe post-analysis handling. Researchers should read a third-party report as strong evidence about one defined sample, and combine it with their own receipt and storage records to reason about the material actually in use.
