3rd Party Testing
Where to get a peptide independently tested, and the labs behind our own published results.
Our UK stock booked for the full panel: lab tested peptides.
How to get a peptide tested
Step 1
Pick a lab
Labs marked Recommended below are the ones behind our own published results.
Step 2
Choose the tests
Purity (HPLC) and quantity are the standard pair. Add endotoxins and sterility for a full panel.
Step 3
Post a sealed vial
Follow the lab's sample instructions. Many labs publish results online with a code anyone can check.
Step 4
Below the guaranteed purity?
Send us the report within 14 days of delivery and we review it under our Purity Guarantee.
Janoshik Analytical
RecommendedCzech Republic · EU
Independent analytical laboratory specialising in testing research compounds and peptides with fast turnaround times and researcher-friendly pricing. Widely trusted across the peptide research community.
Institute for Life Sciences (ILS)
United States
US-based contract research organisation offering bioanalytical, HPLC and mass spectrometry testing for peptides and research compounds. Long-standing reputation in the North American research community.
Vanguard Laboratory
RecommendedUnited States
US independent analytical laboratory, ISO/IEC 17025:2017 accredited (A2LA), providing HPLC and LC-MS testing of research peptides. Popular for fast turnaround and clear, well-formatted Certificates of Analysis suited to researcher review.
BT Labs (Better Testing)
RecommendedUnited States
US-based analytical laboratory offering third-party verification of research peptides via HPLC and mass spectrometry. Recognised for reliable identity and purity confirmation on peptide samples.
Uzorak
Europe
European laboratory offering a Standard + LC-MS package for research peptides: HPLC purity, identity confirmation and degradation profiling.
Marfleet Analytical Services
RecommendedUnited Kingdom
UK-based independent analytical laboratory founded in 2015, specialising in quality control testing for pharmaceutical, healthcare and speciality chemical markets. Offers HPLC, LC/MS, GC/MS and FTIR analysis for peptides and research compounds.
Analiza Białek
RecommendedPoland · EU
EU-based analytical laboratory at Wrocław Technology Park, Poland, specialising in peptide and protein purity verification via HPLC-DAD, UV-VIS and GC-MS. Reports include a sample photograph and live database verification. One of the most active EU peptide testing services.
Eurofins Scientific
Luxembourg · Pan-European
Global leader in bioanalytical testing with extensive peptide and API analysis capabilities across 60+ countries.
SGS Life Science Services
Switzerland · EU-Wide
World-leading inspection, verification, and certification company offering pharmaceutical and biopharmaceutical testing.
Intertek Pharmaceutical Services
United Kingdom
Total quality assurance provider offering comprehensive pharmaceutical testing including peptide characterisation.
Charles River Laboratories
United Kingdom · EU
Comprehensive biological testing and contract research services for peptide-based therapeutics and research compounds.
Concept Life Sciences
United Kingdom
UK-based analytical and bioanalytical services provider with expertise in pharmaceutical compound testing.
WESSLING Group
Germany · EU
European testing and advisory group offering pharmaceutical quality control and analytical testing services.
Tentamus Group
Germany · Pan-European
Network of independent laboratories specialising in life science testing including research compounds.
LGC Group
United Kingdom
Global leader in measurement science, reference materials, and analytical services including peptide analysis.
Our testing record
We publish the certificates exactly as the laboratory reported them
Independent lab results are published in our COA Library, exactly as the issuing laboratory reported them.
10
certificates published
each one open to check with the lab that issued it
5
independent laboratories
Janoshik, Analiza Białek, BT Labs, Chromate, Marfleet
99.29–99.97%
published purity range
as reported by the issuing laboratory
13
further tests due
End of October · From late October
Four different angles, not one
A single certificate from a single source proves very little. Our results come from four routes that are hard to stage together.
Random QC on our own UK stock
We pull samples from stock we are already holding and send them out ourselves. Retatrutide, Analiza Białek, August 2026: content returned at 21.86mg against a 20mg label.
Supplier-submitted certificates
Certificates issued to our suppliers, published as received. Tirzepatide via Chromate, which includes LAL endotoxin testing.
Independent blind group testing
Testing we did not control or commission. Our Retatrutide appeared in the Janoshik "Common GLP-1 blind test", where samples are submitted without the seller running the process.
Vetting suppliers before onboarding
Prospective suppliers are sampled and tested before we list anything from them, not after a problem shows up.
13 further tests are with laboratories or booked in, with results expected end of october and from late october. They will be published in the COA Library as they land.
View the COA LibraryStrictly for laboratory research. Not for human consumption.
See our tested compounds
Independently verified, and published in full. Browse UK stock for 24 hour dispatch, or the full factory-direct catalogue.
Sold strictly for laboratory research. Not for human consumption.