How to Read a Retatrutide Certificate of Analysis
What KYIN Peptides' Retatrutide certificate of analysis actually reports, and how to independently verify it.
What KYIN's Retatrutide COA Reports
Every batch of KYIN's Retatrutide is independently tested by Janoshik, a third-party lab widely trusted in the peptide research community, to 99.756% purity. The certificate reports two main things: an HPLC (high-performance liquid chromatography) purity result, which separates the sample into its constituent compounds and reports the percentage of the total peak area attributable to the target peptide, and a mass spectrometry (MS) identity confirmation, which verifies that the dominant peak actually corresponds to Retatrutide's expected molecular weight rather than a different peptide or a degradation product. For a fatty-acid-conjugated, multi-receptor-agonist peptide like Retatrutide, molecular weight confirmation via MS is a meaningfully more specific identity check than purity alone, since a mislabeled or substituted compound could still return a clean-looking HPLC trace without matching the expected mass.
Reading the HPLC Trace
On the HPLC chromatogram, look for a single, sharp, dominant peak accounting for the reported purity percentage, with any secondary peaks (representing synthesis byproducts, incomplete deprotection, or degradation) making up a small remainder. A purity result in the high 90s with one clean dominant peak is the expected picture for a well-synthesized batch; multiple significant secondary peaks, a broad or shouldered main peak, or a purity result reported without an accompanying visible chromatogram are all reasons to ask more questions of a supplier before relying on the result.
How to Verify Independently
Janoshik publishes verifiable results at janoshik.com/verify — every KYIN Peptides certificate of analysis can be cross-checked against the lab's own records using the batch number printed on the certificate, rather than relying on the PDF or image alone. This independent verification step is the main practical defense against a fabricated or altered certificate, which is a documented problem in the unregulated research-peptide market. See our general How to Read a Certificate of Analysis guide for the fundamentals that apply across every compound in KYIN's catalogue.
Retatrutide testing questions
What purity does KYIN Peptides' Retatrutide meet?
KYIN Peptides' Retatrutide is independently tested by Janoshik to 99.756% purity, with mass spectrometry identity confirmation — see the current batch's certificate of analysis on the product page.
How can I verify a Retatrutide certificate of analysis is genuine?
Every batch number on a KYIN Peptides certificate of analysis can be independently cross-checked at janoshik.com/verify against the testing lab's own records, rather than relying on the PDF or image alone.
Interested in Retatrutide?
See pricing, current batch purity, and the full certificate of analysis on the product page.