Guardian Labs Research & Education explains how research peptides are tested and documented, and how to judge what a supplier shows you. Each guide starts with a short, direct answer, followed by the details.
Guardian Labs is an Idaho-based supplier of research peptides. We publish third-party Certificates of Analysis and HTML batch testing records for our products on the Certificates of Analysis page.
COA & Testing
- What Should a Peptide COA Contain? — A complete peptide Certificate of Analysis names the product, lot number, testing laboratory, test date, identity result, purity result and test methods. Here is what each part means.
- How to Read a Peptide COA — A step-by-step guide to reading a peptide Certificate of Analysis: check the header, match the lot, then read the identity, purity, content and safety results against their specifications.
- Identity Testing vs. Purity Testing — Identity testing confirms what a sample is; purity testing measures how much of it is that compound. A reliable peptide COA needs both.
- Why Batch-Specific Testing Matters — Each production batch can differ. A batch-specific COA ties results to the lot you receive; a generic COA only shows that one sample passed at one point in time.
- How to Verify Third-Party Lab Testing — To verify a COA, confirm the lab exists, check the report through the lab’s own verification system or by contacting it, and match the lot number to your vial.
Purity
- How Peptide Purity Testing Works — Peptide purity is usually measured by HPLC: the sample is separated on a column and the area of the main peak is compared with all detected peaks. Here is how it works and what it can miss.
- What Does ≥99% Purity Mean? — "≥99% purity" means at least 99% of the material detected by the test method was the target peptide. It does not by itself confirm identity, quantity or sterility.
Choosing a Supplier
- How to Evaluate a Research Peptide Supplier — A checklist for evaluating research peptide suppliers: batch-specific third-party COAs, identity and purity testing, verifiable labs, clear company information, compliant marketing and responsive support.
- How Research Peptide Suppliers Differ — Research peptide suppliers differ in testing depth, batch transparency, sourcing, documentation, compliance and support. Here are the differences that matter most.
Storage & Handling
- How Research Peptides Should Be Stored and Handled — Lyophilized research peptides are best stored cold, dry and away from light. Reconstituted peptides are usually refrigerated, used within a defined period and protected from repeated freeze–thaw cycles.
More from the Guardian Labs blog
- Guide to Understanding a Peptide COA the Right Way
- How Researchers Test Peptides for Accurate Results
- What Makes a Research Peptide Truly Lab-Grade?
- All blog articles
Testing records
Every published Guardian Labs batch record, with lot number, laboratory, report date, purity and a link to the original PDF, is listed on the Certificates of Analysis page.
All Guardian Labs products are sold for laboratory research use only. They are not for human or veterinary use, and nothing on this page is medical advice.