Independent testing labs.

The practical reality of the gray market is that a seller's word is just that — a word. Independent analytical labs are how you check it: a sample goes in, and they measure what's really there — purity by HPLC, identity by mass spectrometry — with no stake in the sale.

These are analytical labs, not stores. Every name here tests a sample you already have; none of them sell peptides. Listing them is not an endorsement of any vendor — or any product — whose COA they may have produced. A lab result describes the sample submitted, not necessarily the exact vial in your hand. Harm-reduction reference only; not a recommendation to buy or use anything.

• ISO 17025 · US-based · sterility + endotoxin Vanguard Laboratory An ISO/IEC 17025-accredited US lab (Olympia, WA) that tests submitted samples: HPLC purity and quantity, plus the safety tests most research COAs skip — sterility (USP <71>), bacterial endotoxin (USP <85>), and heavy metals by ICP-MS. Runs a "Verified by Vanguard" certification program.
• HPLC · Mass spec · public COA database Janoshik Analytical The most widely used independent lab in the research-peptide world. Runs HPLC purity and mass-spec identity, and publishes results to a public database you can query by batch ID — so a result can be confirmed at the lab itself, with the seller out of the loop.
• HPLC + dual mass spec · US-based (AZ) MZ Biolabs A Tucson, AZ analytical lab that specializes in peptide and SARM testing for researchers. Pairs HPLC-UV with high-resolution accurate-mass spectrometry (Bruker QTOF + ion trap) for two-instrument identity and purity, and will develop custom methods for novel compounds that aren’t on a standard menu.
• ISO 17025 · US-based · detailed reports Colmaric Analyticals An ISO/IEC 17025-accredited US lab serving the pharma, nutraceutical and supplement industries that also tests research peptides. Runs HPLC purity and mass-spec identity, and is known in the community for unusually thorough, detailed reports.
• Mail-in · US-based ACS Laboratory A US analytical lab that accepts mail-in samples from across the country and returns HPLC purity, mass-spec identity, and a full Certificate of Analysis.
• Contract analytical lab Creative Proteomics A contract analytical-services lab offering reversed-phase HPLC purity analysis and mass spectrometry (including MALDI-TOF) for peptides — set up for researchers commissioning their own testing.