The specifics, since they change the answer: MKM · survodutide.
I have the document in front of me and I can read the numbers. What I cannot do is interpret them.
I am reasonably comfortable with statistics and completely uncomfortable with chromatography, or vice versa.
Which parts of this are informative and which are decoration?
A certificate without a method section is giving you a claim rather than a measurement, and claims are not evidence.
Lot number visibility is the first check, and it is the one most certificates fail — the number is not printed on the vial, or it is on the certificate but the vial is unmarked.
| Component | Typical share | Counted in purity? | Counted in content? |
|---|---|---|---|
| Target peptide | 88–94 % | Yes, as main peak | Yes |
| Related impurities | 1–3 % | Yes, as other peaks | No |
| Counter-ion (TFA or acetate) | 2–8 % | No | No |
| Residual water | 2–6 % | No | No |
| Bulking agent, if present | 0–40 % | No | No |
Comparison across certificates from different laboratories is almost never valid, even when the material is the same, because the methods are almost never the same.
Industry guidance on this topic is consistent because it comes from first principles rather than convention.
The practical summary: check the lot number, ask for the method, and reserve judgement until you have both.
Aggregated, published test results and vendor ratings built from submitted batches. Methodology stated, dataset browsable, no listing fees.
Browse resultsIn practice, the certificate is not the answer to your question; it is a data point that you need to combine with other information to build an answer.
Writing the lot number on your vial in permanent marker is worth doing because it later proves that the certificate traces to your material.
Worth being precise here: the laboratory name and accreditation status can be checked in real time against the testing service's own register, and that two-minute check catches substituted certificates.
The caveat is that a certificate is not a guarantee, it is a data point, and treating it as anything else is asking for disappointment.
If the certificate does not trace to your vial, it is not evidence about your vial.
It helps to be literal here: a useful certificate has five elements: the lot number, the analytical method, the reported result with units, the date of analysis, and the primary data or a reference to it.
Multiple testing on the same lot reported in a single document suggests internal quality control; identical figures across different lots suggests the same certificate reused.
On the detail: a method section that differs markedly from pharmacopoeial standards is either innovative or nonstandard, and distinguishing the two requires expertise.
The standards that exist in this space — ICH Q3A, Q3B and various pharmacopoeial chapters — are worth reading once even if nothing you test is obliged to meet them.
My working rule is that a document without a lot number, a method section and a test date is marketing.
edited 21 Jan 2025 by ilaria_bertone — removed a claim I could not source
Ask PeptideStack is a static archive. Posting is closed, but the norms are worth stating: answer the question that was asked, show your working, cite the trial or the certificate, and say plainly where the evidence runs out.