Where to Get Peptides Tested for Purity

A lab with no ownership or commercial tie to the peptide seller runs the analysis and issues the report. This is the only route that produces third-party purity data you can hand to an auditor, a pharmacy quality record, or a customer. Look for the integrated chromatogram, the detection wavelength, and a report number the lab will confirm.

Best for: Researchers, pharmacies, and buyers who need a defensible number

Typical cost: $150-$300 per sample for HPLC purity

Many universities run proteomics or analytical cores with HPLC and LC-MS capability. Access is usually restricted to affiliated researchers, queues can run weeks, and reports are typically data files rather than a formal COA with a specification and approval signature.

Best for: Academic groups with internal access and flexible timing

Typical cost: Often subsidized internally; external rates vary

A COA supplied by the seller may be perfectly accurate, but it is commissioned and controlled by the party with an interest in the result. Treat it as a starting point and check it against an independent test when the answer matters.

Best for: A first look, not verification

Typical cost: Usually bundled into the product

Full-service CROs handle validation packages, stability programs, and regulatory submissions. For a single purity number this is far more scope, cost, and lead time than the question requires.

Best for: Regulated programs needing GMP-style documentation

Typical cost: Substantially higher, with setup fees common