Our Quality Standards

Every product in our 23-peptide catalog is manufactured domestically in the United States, in compliance with WHO Good Manufacturing Practice (GMP) guidelines. Domestic manufacturing is not a marketing line — it is what makes per-batch quality control possible. Controlled, documented, cold-chain manufacturing close to the customer means we own the supply chain from synthesis to packaging to ship.

Practical implications: shorter lead times, full regulatory traceability, end-to-end documentation, and the ability to recall or correct any specific batch if needed.

Every batch of peptide we sell is independently tested by a third-party laboratory using two complementary analytical techniques:

High-Performance Liquid Chromatography (HPLC)

HPLC quantifies what fraction of the sample is the target peptide. We test at 214 nm (the wavelength absorbed by peptide bonds) using reverse-phase HPLC with C18 column chemistry. The result is reported as Area Under Curve percentage — the actual purity figure that appears on every COA.

Mass Spectrometry (MS)

Mass spectrometry confirms the molecular identity of the target peptide — verifying that the dominant species in the sample matches the labeled compound's theoretical molecular weight. Both techniques together give a complete identity-and-purity characterization. One without the other is incomplete.

Every batch in our catalog ships with a per-batch Certificate of Analysis (COA), published in our public COA Library and indexed by lot number. Every COA contains:

• Compound identification (name, sequence, theoretical molecular weight)
• HPLC purity result with the underlying chromatogram visible
• Mass spectrometry result with theoretical and observed molecular mass
• Water content (Karl Fischer titration)
• Residual solvent levels (gas chromatography)
• Endotoxin levels (LAL test)
• Test date, lot number, and the testing laboratory's signature

COAs are visible before purchase, at peptivalabsus.com/coa-library, indexed by lot number printed on the vial label.

Every PeptivaLabs vial ships with an NFC-encoded blockchain authentication tag, issued through our independent supply-chain authentication partner Authentichain. The tag is bonded to the vial label and cannot be peeled, reused, or cloned.

When a researcher taps the vial with a smartphone, the verification page reads the NFC serial number, queries the blockchain for the batch record associated with that serial, and displays the on-chain data alongside the manufacturer's metadata. The on-chain record is held by Authentichain — independent of PeptivaLabs. We cannot retroactively change a batch record. The audit trail is auditable by any third party.

For a full walkthrough, see our NFC + Blockchain Verification page.

Every shipment is packed for temperature stability and ships via FedEx 2-Day. Ice packs are available on request at no charge for cold-chain-sensitive compounds. Recommended storage conditions for each peptide are listed on the product detail page; lyophilized peptides are typically stable at −20 °C long-term and at room temperature for short-term shipping windows.

For peptides with literature variants — for example, full-length Tβ4 versus the TB-500 fragment — our COAs explicitly disclose the specific sequence in the vial. Researchers can match their material directly to the published literature without ambiguity.

To be clear about what is excluded from our quality standards by deliberate choice:

• We do not sell peptides without per-batch COAs.
• We do not reuse lot numbers across batches.
• We do not attest to our own quality without independent third-party verification.
• We do not ship internationally — quality control breaks down across the longer logistics chain.
• We do not market our products as substitutes for FDA-approved drugs.