Every compound we carry has been independently analyzed at the molecular level before it reaches any researcher's hands.
Browse compoundsImpure compounds introduce uncontrolled variables. In in vitro research, that means data you can't trust. HPLC purity analysis and mass spectrometry identity confirmation are not optional extras — they are the minimum standard for compounds used in serious research.
Every lot of every compound we carry is tested by an independent, independent third-party laboratory before we accept delivery. The resulting Certificate of Analysis ships with every order.
High-performance liquid chromatography separates compound components and quantifies purity by peak area integration. Our threshold is ≥98.0% for all compounds.
Electrospray ionization mass spectrometry (ESI-MS) confirms molecular identity by measuring the exact mass-to-charge ratio of the compound and its fragments.
Compounds are monitored throughout cold-chain handling. Temperature logs are maintained from receipt through shipment, ensuring peptide integrity is preserved.
Every lot ships with a Certificate of Analysis from an independent third-party laboratory that has .
Every compound carries a unique lot number traceable back to its synthesis batch, testing results, and storage history. That lot number ships on the COA with every order.
Any lot that tests below ≥98.0% purity is rejected and not offered for sale. There are no exceptions and no tiered purity grades — every compound in our catalog meets the same minimum.
The Certificate of Analysis is not a summary or a marketing document — it is the complete raw output of the testing laboratory, available for download on every product page.
Every synthesis partner is evaluated against documentation requirements, capacity for consistent GMP-adjacent production, and track record before any commercial relationship is established.
Vendor qualificationIncoming lots are received under cold-chain conditions and quarantined pending independent testing. No lot enters our available inventory until testing is complete and passed.
Cold-chain receiptHPLC purity and ESI-MS identity analysis conducted by our independent third-party partner laboratory. Results reviewed against our ≥98% threshold.
HPLC + ESI-MSThe laboratory's Certificate of Analysis is archived against the lot number and made available for download on our product pages. Archived indefinitely for reference.
COA archivingPassed lots are transferred to monitored −20°C storage. Temperature is logged continuously and reviewed on a regular cadence.
−20°C monitoredOrders are picked, packed with cold-chain materials, and dispatched with the COA, lot number, handling instructions, and research disclaimer included in every shipment.
Full documentationAll products sold by Classic Peptides LLC are intended for in vitro research and laboratory use only. Not for human or veterinary consumption. Not approved by the FDA. Must be 18+ to purchase.