01
Batch Testing on Arrival
When a new batch lands at our UK warehouse, samples are immediately sealed and dispatched for independent third-party analysis — before any unit is offered for sale.
Independent Third-Party Peptide Testing in the UK
Every batch of research peptides supplied by RETA UK is independently verified by accredited third-party laboratories using HPLC and mass spectrometry — before it reaches researchers.
At RETA UK, peptide quality assurance is not an afterthought — it is a structural commitment to the UK research community we supply. Every new batch of research compounds arriving at our warehouse is independently analysed by an accredited third-party laboratory before it is released into circulation, so the Certificate of Analysis (CoA) accompanying each product reflects the exact stock currently being shipped to UK researchers.
Our UK Peptide Testing Process
We follow a transparent, repeatable workflow designed around three core principles for every research peptide we supply:
02
Accredited Third-Party Laboratories
We partner with internationally recognised accredited laboratories — including Janoshik Analytical (Czech Republic) and Analiza Białek (Poland) — for all peptide verification work.
03
HPLC + Mass Spectrometry Verification
Each compound is profiled using HPLC for percentage purity and related-substance detection, and mass spectrometry for unambiguous molecular identity confirmation.
Analytical methods we rely on for peptide verification
- HPLC (High-Performance Liquid Chromatography) — confirms percentage purity (≥99%) and detects related substances or degradation products in every research peptide sample.
- Mass spectrometry — verifies the molecular weight of the compound and provides unequivocal peptide identity confirmation.
- Supplementary peptide assays — additional analytical methods are commissioned where the compound profile demands further validation.
Publishing the Certificate of Analysis
Once the laboratory returns its certificate, our team reviews the data internally and publishes the verified Certificate of Analysis on this page as soon as it is cleared. This guarantees the documentation UK researchers see always corresponds to the batch of research peptides currently in circulation — never historical data from a previous lot.
Our Commitment to UK Research Peptide Quality
Transparency is the bedrock of credible peptide research supply in the UK. By independently testing every new batch through accredited third-party laboratories — and by combining HPLC and mass spectrometry rather than relying on a single technique — we hold the quality of our research compounds to a consistently high standard, batch after batch.
Fresh testing. Verified results. Transparent data.
- Independent UK laboratory testing on every new batch
- HPLC + mass spectrometry for identity and purity
- Certificates always reflect the current stock
How to Verify Your Batch
You can review the independent Certificate of Analysis (CoA) for any batch we currently have in circulation directly on this page:
- Use the search field below to filter results by product name, laboratory, or test date.
- Click View Certificate next to the product you ordered to see the verified HPLC and mass spectrometry data.
- If you would like written confirmation of the batch attached to your specific order, contact us through our contact form with your order number and we will reply with the corresponding certificate.
| Batch ID | Product | Test Type | Laboratory | Purity | Date | Certificate |
|---|---|---|---|---|---|---|
| EGB-0426-RT30 | Retatrutide 30mg | HPLC + Mass Spectrometry | Janoshik Analytical | 99.71% / 99.46% | ||
| EGB-0226-RT10 | Retatrutide 10mg | HPLC + Mass Spectrometry | Janoshik Analytical | 99.753% / 99.744% | ||
| EGB-RT30-BBG50 | Retatrutide 30mg | HPLC + Mass Spectrometry | Janoshik Analytical | 99.764% / 99.736% |
No batches match your search.
All certificates are issued by independent third-party laboratories and can be cross-verified directly at janoshik.com/verify using the unique key printed on each report.
Research compounds tested at RETA UK
Browse the full catalogue of HPLC-tested, COA-verified research peptides supplied from our UK warehouse:
Frequently Asked Questions
Every batch of research peptides supplied by RETA UK is independently tested by accredited third-party laboratories using High-Performance Liquid Chromatography (HPLC) for purity quantification and mass spectrometry for unambiguous identity confirmation. Verification is performed before any product is released for sale.
RETA UK partners with internationally recognised accredited laboratories including Janoshik Analytical (Czech Republic) and Analiza Białek (Poland) to verify every new batch. All certificates can be cross-checked at janoshik.com/verify using the unique identifier printed on each report.
All current Certificates of Analysis are published on this page. You can search by product name, laboratory or test date and click View Certificate to see the verified HPLC and mass spectrometry data. For written confirmation of the specific batch attached to your order, contact us through our contact form with your order number.
RETA UK relies on two primary analytical methods: HPLC (High-Performance Liquid Chromatography) for percentage purity and detection of related substances, and mass spectrometry for molecular weight verification and identity confirmation. Supplementary assays are commissioned where the compound profile demands further validation.
Every new batch arriving at the RETA UK warehouse is tested before being offered for sale. The published Certificates of Analysis always reflect the stock currently in circulation — never historical data from previous lots.