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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.

Last reviewed

Claimed vs measured: sample results

Supplier-claimed purity compared with measured HPLC purity and LC-MS identity for independently tested peptide samples
PeptideClaimedMeasuredMethodResultFinding
Semaglutide99.0%94.2%RP-HPLC 214 nmBelow claimTwo deletion-sequence impurities above 1.5% area.
Tirzepatide99.5%98.9%RP-HPLC + LC-MSMatchObserved mass within 0.4 Da of theoretical.
Retatrutide99.0%88.6%RP-HPLC + LC-MSBelow claimLong sequence; truncated fragment at 6.1% area.
BPC-15799.0%97.8%RP-HPLC 214 nmMatchWithin typical research-grade tolerance.
TB-500 (TB-4 fragment)98.0%71.4%RP-HPLC + LC-MSBelow claimMannitol excipient counted as active in supplier COA.
Tesamorelin99.0%96.1%RP-HPLC + LC-MSBelow claimOxidized methionine variant at 2.2%.
"GLP-1 blend" vial99.0%n/aLC-MS/MS identityIdentity mismatchObserved mass matched liraglutide, not the labeled sequence.
MOTS-c98.0%98.3%RP-HPLC + ESI-MSMatchIdentity 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

Ship a sealed vial and we return a batch-specific Certificate of Analysis with the raw chromatogram and mass spectrum attached. Independent lab, no supplier affiliation, 9-11 business day turnaround.

Related reading

How to read a peptide COA
Every field on a certificate, explained.
How to choose a peptide testing lab
Nine questions to ask before you ship a sample.
Where to buy certified peptides
How to verify any supplier's certification claim.
Peptide purity testing cost
Per-sample and panel pricing, itemized.

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

Yes. Each row summarizes an anonymized result from a sample independently tested at ACS Peptide Testing Labs. Supplier names and batch numbers are withheld because samples are submitted under confidentiality, but the methods, claimed values, and measured values are reported as recorded on the issued Certificate of Analysis.

Three common causes: excipients such as mannitol counted toward active peptide content, purity reported at a wavelength or integration window that hides impurities, and COAs copied forward from an earlier batch rather than run on the batch being shipped. Independent HPLC and LC-MS on the actual vial removes all three.

Yes. Request a redacted sample COA through the quote form and we will send the full document, including the HPLC chromatogram at 214 nm, the LC-MS identity spectrum, and the pass/fail specification table.

Ship a sealed vial containing at least 100-500 ug of lyophilized material by overnight courier. Standard turnaround is 9-11 business days, and results are issued as a batch-specific Certificate of Analysis with the raw chromatogram attached.

Research-grade peptides target 95% or higher HPLC purity; GMP-grade material targets 98% or higher with bounded impurity limits. Anything measured below 95% warrants re-verification before the material is used in any study.

No. ACS Peptide Testing Labs is an independent analytical laboratory in Sun City Center, Florida with no ownership, referral, or reseller relationship with any peptide manufacturer or supplier. That independence is what makes the results above usable as verification.

Ready to Get Started?

Contact us today for a free consultation and customized quote for your peptide testing needs.

(561) 513-8435cpierre@acslabtest.com