COA for retatrutide: our 7 certificates of analysis Janoshik
A Certificate of Analysis ( COA) is the only objective proof of the contents of a vial. Here are the seven Janoshik reports for our retatrutide, with images and their verification key, followed by instructions on how to read a COA and identify a fake.
Retatrutide R3 10 mg – €59.90Retatrutide R3 20 mg – €99.90
The essentials
- 7 reportsJanoshik on 5 batches: 3 for the 10 mg bottle, 4 for the 20 mg bottle.
- HPLC purity of 99.446 to 99.940%.
- Measured quantity greater than the label: from 11.46 to 11.74 mg for 10 mg, from 22.76 to 23.40 mg for 20 mg.
- Blind tests: Janoshik himself identifies the molecule without knowing which one it is.
- Each report contains a key that allows it to be verified at Janoshik.
Our 7 analytical reports
| Product | Batch | HPLC Purity | Quantity measured | Report / key |
|---|---|---|---|---|
| Retatrutide 10 mg | 777333 | 99,820 % | 11.46 mg | #229260 · 5S2B3XVZ9481 |
| Retatrutide 10 mg | 777333 | 99,940 % | 11.55 mg | #216554 · WGSRZS5YMC2T |
| Retatrutide 10 mg | MP-VIAL77711 | 99,922 % | 11.74 mg | #223430 · RRE5KQ46Z6RC |
| Retatrutide 20 mg | MP-777RT202 | 99,446 % | 22.78 mg | #241204 · GBVZ8XEY3THI |
| Retatrutide 20 mg | MP-777RT201 | 99,852 % | 23.33 mg | #226146 · S4JYCX1DK2PT |
| Retatrutide 20 mg | MP-777RT201 | 99,902 % | 22.76 mg | #223435 · HYUP43B55P3Z |
| Retatrutide 20 mg | 777521 | 99,778 % | 23.40 mg | #214175 · H4W5LK6XR35W |
Two batches (777333 and MP-777RT201) were analyzed twice, several weeks apart, with consistent results. All our other certificates (GHK-Cu, tirzepatide, bacteriostatic water, etc.) are on the pagecertificates of analysis.
Certificates in pictures
How to check a Janoshik report
- Note the report number (e.g. #229260) and the key (e.g. 5S2B3XVZ9481) in the table above or in the image.
- Open the verification page on the Janoshik Analytical website and enter them.
- Compare the report displayed with that of the seller: molecule, quantity, purity and date must be identical.
A COA that cannot be verified in this way provides no guarantee: an image can be easily changed.
The complete 5-step guide to verifying a Janoshik certificate
Read a COA for retatrutide
| Report line | What it measures | What you need to see |
|---|---|---|
| Identity | The molecule found in the vial | Retatrutide, identified by the laboratory (ideally blinded) |
| Purity (HPLC) | The proportion of retatrutide among the substances detected | 99% or more, with decimals (a round value is suspicious) |
| Quantity | The milligrams actually present | At least the quantity indicated on the label |
| Batch and date | The batch tested and the time of the test | A batch that corresponds to the product sold, a recent date |
The details of the HPLC method are explained in our article "Understanding an HPLC Analysis Certificate." The measured quantity is also used to calculate an exact concentration with the reconstitution calculator.
How to spot a fake COA
- No key or verifiable number, or a report that could not be found on the laboratory's website;
- The manufacturer's COAinstead of an independent analysis;
- A round purity(99.9%) without decimals or chromatogram;
- No quantity measured, only purity;
- The same old reportpresented for all lots, or a report on behalf of another shop.
These signals are among the criteria detailed on our pagesupplier of retatrutide in France.
Formats and prices
| Product | Quantity measured (tested batches) | Price |
|---|---|---|
| Retatrutide R3 10 mg | 11.46 to 11.74 mg | 59,90 € |
| Retatrutide R3 20 mg | 22.76 to 23.40 mg | 99,90 € |
| R10 Pack | Retatrutide 10 mg + reconstitution kit | 69,90 € |
| R20 Pack | Retatrutide 20 mg + reconstitution kit | 109,90 € |
HPLC purity of 99.446 to 99.940% on our 7 Janoshik reports. Delivery €10, shipped from the European Union.
Retatrutide R3 10 mg – €59.90Retatrutide R3 20 mg – €99.90
Frequently Asked Questions
What is a COA of retatrutide?
This is the batch analysis certificate: it indicates the identified molecule, its purity measured by HPLC, and the quantity present in the vial. At MyPeptide, each batch of retatrutide is analyzed by Janoshik before being sold.
How to verify a Janoshik COA?
Enter the report number and key printed on the certificate on the Janoshik verification page. The displayed report must be identical to the seller's report.
Why does a 10mg vial contain more than 10mg?
Manufacturers fill slightly above the label to compensate for losses. In our tested batches, Janoshik measured 11.46 to 11.74 mg per 10 mg vial.
What level of purity can be expected from retatrutide?
At least 99% in HPLC for a quality research peptide. Our 7 reports give values from 99.446 to 99.940%.
What does "blind test" mean?
Janoshik receives the sample without knowing whether it is semaglutide, tirzepatide, or retatrutide, and identifies the molecule himself. The seller therefore cannot influence the result.
Janoshik Analytical reports, August to October 2026. MyPeptide products are intended exclusively for scientific laboratory research.