RESEARCH GUIDES
How to Read a Peptide COA
A COA, or certificate of analysis, reports test results for a particular sample. Start with what was tested, the method used and the batch described. A purity percentage alone does not answer every question about a material.
Editorial team: JEWJITSU PEPTIDES · Reviewed · Report a correction
1. Match the material, strength and batch
Retatrutide is not Tirzepatide, and single-material Ipamorelin is not a CJC-1295 blend. Compare the full name, labeled strength and batch number with the item being reviewed. A 10 mg report does not automatically verify a 20 mg pack or another batch.
A batch number identifies the reported lot; a test number identifies a laboratory task. If these details disagree, request clarification before drawing a conclusion.
2. Quantity, purity and identity are different measurements
Janoshik lists identification, amount and peptide purity separately for its GLP-1 test, with HPLC as the method and units such as mg per vial. Read the measurement, units and method on the actual report: an amount in mg is not a purity percentage.
High purity does not establish sterility or absence of endotoxins. Janoshik offers separate tests for these. Mixtures can also limit what can be measured, so read the report's notes.
3. Verify the source and check the date
Janoshik's official verification page asks for a task number and unique key. When available, use them at the laboratory's website and compare the returned report with your copy. A logo or screenshot alone does not authenticate a document.
Our library shows redacted copies with identifying details hidden. Contact us if the copy lacks information needed for an independent check. A newer date does not replace a matching material and batch.
4. Connect the report to the catalog item
Select a strength on the product page to see its available certificate. The COA library may also contain other batches, so do not assume every report there applies to the selected item. Results describe the tested sample; they are not medical approval or evidence of an outcome in a person.