Verified Peptide Test Results
Anonymized results from peptides submitted to our lab, showing what the supplier claimed next to what the instrument measured. Every row came off a signed Certificate of Analysis.
Claimed vs measured: sample results
| Peptide | Claimed | Measured | Method | Result | Finding |
|---|---|---|---|---|---|
| Semaglutide | 99.0% | 94.2% | RP-HPLC 214 nm | Below claim | Two deletion-sequence impurities above 1.5% area. |
| Tirzepatide | 99.5% | 98.9% | RP-HPLC + LC-MS | Match | Observed mass within 0.4 Da of theoretical. |
| Retatrutide | 99.0% | 88.6% | RP-HPLC + LC-MS | Below claim | Long sequence; truncated fragment at 6.1% area. |
| BPC-157 | 99.0% | 97.8% | RP-HPLC 214 nm | Match | Within typical research-grade tolerance. |
| TB-500 (TB-4 fragment) | 98.0% | 71.4% | RP-HPLC + LC-MS | Below claim | Mannitol excipient counted as active in supplier COA. |
| Tesamorelin | 99.0% | 96.1% | RP-HPLC + LC-MS | Below claim | Oxidized methionine variant at 2.2%. |
| "GLP-1 blend" vial | 99.0% | n/a | LC-MS/MS identity | Identity mismatch | Observed mass matched liraglutide, not the labeled sequence. |
| MOTS-c | 98.0% | 98.3% | RP-HPLC + ESI-MS | Match | Identity and purity both confirmed. |
Supplier names and batch numbers are withheld under client confidentiality. Methods, claimed values, and measured values are reported exactly as issued.
What the aggregate data says
73%
of samples showed a purity discrepancy against the supplier claim
8.4 pts
average gap between claimed and measured HPLC purity
27%
of supplier COAs matched independent results line for line
The full statistical breakdown, including contaminant and endotoxin failure rates, lives on our peptide testing statistics page. For how these numbers are produced, see HPLC peptide purity testing and mass spectrometry identity confirmation.
Get your own batch verified
Related reading
Methodology: purity by reverse-phase HPLC with UV detection at 214 nm, area percent of all integrated peaks. Identity by LC-MS/MS or ESI-MS against the theoretical monoisotopic mass. Heavy metals by ICP-MS per USP <232>/<233>. Endotoxin by kinetic chromogenic LAL per USP <85>.
Verified results: frequently asked questions
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