What COA Ships with Retatrutide to Argentina

Every lot of retatrutide shipped to Argentina leaves with a Certificate of Analysis issued by Janoshik Analytical, an independent laboratory based in the Czech Republic that specializes in third-party verification of research peptides. The document identifies the lot by task number, reports purity as measured by HPLC chromatography, and records the actual content found in the sample. It is not a manufacturer's specification sheet. It is a signed report from a laboratory that has no commercial interest in the result — which is what makes it checkable.

What a Certificate of Analysis is, and what it is not

A COA is the output of a chemical analysis commissioned from an external laboratory. The supplier provides a sample; the laboratory runs the declared method and returns the data. The document is signed by the laboratory, not by the supplier.

What the COA establishes is the chemical identity and purity of the material analyzed in that specific lot. It says nothing about different lots, about what happens to the material after the laboratory measures it, or about fitness for any particular use.

For the research peptides in the PeptoClinic catalogue, every published report uses HPLC — high-performance liquid chromatography. That method separates the components of a sample based on their physicochemical properties and quantifies what fraction of the total mass belongs to the declared peptide. The result is a purity expressed as a percentage.

A COA issued by a named laboratory with a queryable task number is qualitatively different from a document generated by the supplier itself or from a PDF that cannot be traced to any external system. The task number is the mechanism: it lets the reader pull the data from the laboratory's own database rather than from the supplier's word.

The Janoshik Analytical report for the retatrutide lot

The report PeptoClinic provides with retatrutide lots is Task 136921, analyzed on April 13, 2026 by Janoshik Analytical.

The fields that appear in that document are:

• Compound analyzed: Retatrutide
• Task number: 136921
• Method: HPLC
• Date of analysis: April 13, 2026
• Purity found: 99.893%
• Declared content on the label: 10 mg
• Actual content measured by the laboratory: 11.96 mg

The content figure matters because it answers whether the vial delivers what the label says. In this case, the measured content exceeds the nominal: the laboratory found 11.96 mg where the label declares 10 mg.

How to read the reported purity

The 99.893% is the fraction of the sample's total mass that HPLC attributed to the retatrutide peptide. The remaining fraction may consist of synthesis-related impurities, isomers, or solvent traces, depending on the sample preparation method used by the laboratory.

PeptoClinic does not publish its best result across all available lots. It publishes the worst one. The floor across the entire published catalogue is 99.669%, from the MOTS-c analysis (Task 136923, same date). That standard exists because a headline built on the highest purity figure breaks the first time a lower result is published. The full set of available reports, with task numbers and complete results, is on the quality page.

How to verify the COA independently

Janoshik Analytical operates an online verification system. For Task 136921, the report contains the information needed to retrieve the result directly from the laboratory's own database, bypassing PeptoClinic entirely.

The process works as follows: go to the Janoshik Analytical verification page, enter the task number from the document you received, and the laboratory returns the analysis data from its own records. That step is what distinguishes a verifiable COA from a file anyone could produce in a document editor. If the task number returns no result in the laboratory's system, the document does not correspond to a real analysis.

A note on the other published reports: the GHK-Cu (Task 204977) and BPC-157 + TB-500 (Task 204975) reports also come from Janoshik Analytical and carry the same analysis date. However, the direct verification URL for those two returns an error at the time this post is published. PeptoClinic does not link readers to a broken verifier. If you want to check those reports, enter the task number directly into the laboratory's verification system.

What ships physically with a lot destined for Argentina

Lots of retatrutide quoted for Argentine destinations leave classified as laboratory reference material. The shipping documentation includes the Janoshik Analytical COA and the customs file prepared under that classification — not as a medicine, supplement, or consumer product.

The COA itself does not change by destination. It is the same document, the same task number, and the same analysis results regardless of where the lot arrives. What changes between destinations is the customs paperwork, which is adapted to the applicable regulations in each country. The general conditions for international shipment are detailed on the shipping page.

Argentina has been part of PeptoClinic's served destinations since 2026. The COA is delivered in digital form when an order is confirmed, before the physical lot leaves.

Why the issuing laboratory matters

Not all COAs carry the same weight. A report issued by the supplier itself is not independent verification — the entity with a commercial interest in the result is the one writing it. A report signed by a laboratory whose name does not appear in any identifiable professional record cannot be confirmed by anyone.

Janoshik Analytical is a laboratory with a public history of peptide analysis. Its tasks are queryable by task number. That is what turns the document from an assertion into a data point you can check yourself, without taking the supplier's word for anything. It is also why PeptoClinic publishes the task number and not just the percentage: the number is the address. A purity figure without an address is a claim; a purity figure with a task number in a functioning external system is evidence.

The full set of published reports is listed on the PeptoClinic research peptide catalogue.

Research use only

Retatrutide and all compounds in the PeptoClinic catalogue are supplied strictly for laboratory research — Research Use Only (RUO), meaning in vitro work and controlled laboratory settings.

This material is not approved or intended for human or veterinary use. It is not a medicine, a supplement, or a consumer product. No regulatory authority — not the FDA, not ANMAT, not any equivalent — has evaluated or approved these compounds for therapeutic use. PeptoClinic is not a pharmacy, not a clinic, and does not write, fill, or require prescriptions. Requests for dosing or administration guidance for use in persons fall outside what this service can answer.