Research question
How does GetReta test purity?
Before a GetReta lot is packed, the batch is tested for identity and for chromatographic purity. High-performance liquid chromatography separates the sample and reports the main peak as a percentage of the detected area. The release rule is simple: the lot does not ship as a released research vial unless that HPLC purity is at least 99 percent.
Identity is not left to the chromatogram alone. Mass spectrometry is used to check that the observed mass agrees with retatrutide, CAS 2381089-83-2. A purity percentage without an identity check would only say that one peak dominates. The pair of tests is what the certificate is for. The lot number ties the vial in your hand to that pair of results and to the test date.
Purity is a statement about the solid that was tested. It is not a claim about what happens in a cell, an animal or a person. GetReta does not publish assay outcomes, doses or clinical language on the certificate. If a result on the sheet is unclear, quote the lot code in an email to orders@getreta.co.uk and ask for the page to be explained. Do not invent a number that is not printed.