COA Archive
Every product we ship comes with a full Certificate of Analysis from an independent, accredited third-party laboratory. Not a house lab. Not self-reported. An independent party with no financial incentive to report a favorable result.
What Is a Certificate of Analysis?
A Certificate of Analysis (COA) is the primary quality document accompanying a research compound. It provides analytical evidence that the compound you received is what the label says it is, at the purity stated — and nothing more.
A COA is only meaningful when issued by an independent third-party laboratory. A document produced by the same entity that manufactured the compound has no analytical validity — it is a self-attestation, not independent verification. This distinction matters.
At US Peptide Clinic, every lot is tested by an accredited external laboratory before it is added to inventory. Products failing to meet our purity threshold are rejected — they never reach your order.
When evaluating any peptide supplier's COA, ask these questions:
- Who performed the testing? Is it a named, accredited third-party lab?
- Does the batch number on the COA match the lot number printed on your vial?
- Is the chromatogram embedded, or just a purity percentage with no data?
- Is mass spectrometry data included confirming molecular identity?
- Does the testing date predate your shipment date?
How We Test
High-Performance Liquid Chromatography
Primary purity analysis. Separates compound components under high pressure and UV detection to quantify the target peptide fraction against total peak area. All our products ship at ≥99% HPLC purity.
Mass Spectrometry
Molecular identity confirmation. Measures the exact mass-to-charge ratio of the compound to verify it matches the theoretical molecular weight of the declared peptide sequence. Confirms identity at the molecular level.
Amino Acid Sequence Verification
Confirms the correct amino acid sequence and any post-translational modifications (acetylation, amidation, pegylation, etc.). Critical for complex or modified peptides where sequence errors can occur during synthesis.
Reverse-Phase HPLC
Secondary purity confirmation using a different column chemistry than standard HPLC. Provides an independent purity measurement and helps characterize impurity profiles — residual solvents, incomplete synthesis intermediates, and oxidation products.
What Every COA Contains
Our COAs follow a standardized format so researchers can quickly locate the data they need. Below is every field included in a US Peptide Clinic COA, along with what that field tells you.
| Field | What it tells you |
|---|---|
| Product Name | Full IUPAC name + common research designation |
| Lot / Batch Number | Matches label on vial and secondary packaging |
| Molecular Formula | Verified chemical formula |
| Molecular Weight | Theoretical vs. observed (MS) |
| HPLC Purity | Percentage ± measurement tolerance |
| Chromatogram | Embedded HPLC trace with peak labels |
| MS Spectrum | Observed ion masses confirming identity |
| Impurity Profile | Any peaks >0.1% area identified |
| Testing Date | Date of analysis — relevant for stability assessment |
| Testing Laboratory | Third-party lab name, accreditation, and signature |
| Storage Conditions | Temperature, humidity, light exposure requirements |
| Expiry / Retest Date | Recommended retest date under stated storage conditions |
Your COAs, Per Order
Approved account holders can download lot-specific COAs for every order directly from their account dashboard. COAs are available immediately after your order ships.
Why independent testing is the only testing that counts
No conflict of interest
A third-party lab has no revenue tied to your order passing. Their incentive is methodological accuracy. Ours is reputation. That alignment produces reliable data.
Research reproducibility
Reproducibility failure in peptide research frequently traces back to compound impurity. A COA with a real chromatogram lets researchers assess baseline purity as a variable in their study design.
Regulatory defensibility
In an environment of increasing FDA and state-level scrutiny, documented lot-specific testing is a material component of a compliant research compound program. We keep your records complete.