Research Library · Sourcing Guide
What to Look For in a Research Peptide Vendor
Selecting a source for research compounds is a documentation problem before anything else. In a laboratory setting the value of a peptide depends on whether its identity and purity can be verified, not on marketing language. This overview describes the criteria researchers apply when evaluating a research peptide vendor, framed strictly for laboratory contexts.
For Research Use Only. Not for human or veterinary use. Not a drug, food, or cosmetic. This page is educational reference material for qualified researchers and contains no medical advice, dosing, or health claims.
Batch-Specific Certificates of Analysis
A certificate of analysis documents analytical results for a specific lot. A "sample" or "typical" COA says nothing about the vial in hand; researchers look for a COA tied to the exact lot number received. If the lot on the document does not match the label, the document is reference material rather than verification. Our guide to reading a certificate of analysis walks through each field line by line.
Independent Third-Party Testing
A COA issued by the same entity selling the product carries a conflict of interest. Independent third-party analysis at an accredited laboratory is the more rigorous standard, because the testing party has no commercial stake in the reported figure. Every AurexBioLabs compound is third-party HPLC and mass-spec tested, with a downloadable COA verifiable at aurexbiolabs.com/verify.
Both HPLC and Mass Spectrometry
HPLC reports chromatographic purity; mass spectrometry confirms molecular identity. A COA carrying only one of the two leaves part of the picture open. For a fuller treatment of how the two methods differ, see HPLC vs mass spectrometry in peptide testing.
Transparency and Access
Willingness to provide the COA before purchase, publish lot data openly, and disclose testing methodology are practical signals of documentation discipline. Clear labeling of material as research use only belongs in the same category. Laboratory handling expectations are covered separately in our peptide reconstitution guide.
Frequently Asked Questions
Identity and purity of a specific lot, via HPLC (purity) and mass spectrometry (identity), plus lot number and test date.
An independent accredited lab has no commercial interest in the result, removing the conflict of interest when a seller tests its own product.
A batch-specific COA reports results for the exact lot shipped; a sample or "typical" COA reflects another batch and does not verify the material received.
They are complementary: HPLC for purity, mass spec for identity, so a COA showing both is more complete.
Each product's downloadable COA can be checked at aurexbiolabs.com/verify.
Next Steps
Verification & catalog
For Research Use Only. Not for human or veterinary use. Not a drug, food, or cosmetic. This page is educational reference material for qualified researchers and contains no medical advice, dosing, or health claims.
For Research Use Only. Not for human or veterinary use. Not a drug, cosmetic, or dietary supplement. All information is provided for laboratory research purposes only.