Polder PeptidesTesting
Third-party lab testing
We don't ask you to trust us. We show you the numbers. Every batch of every product is sent to an independent laboratory for purity and potency testing before it reaches our shelves.
Our testing partner: Janoshik
Janoshik is an independent third-party analytical laboratory. They perform high-performance liquid chromatography (HPLC) analysis on our peptide batches. Janoshik is not affiliated with Polder Peptides — their test results are their own.
What we test for
- Purity (HPLC) — the percentage of the sample that is the stated peptide, versus impurities, truncated sequences, or residual solvents.
- Potency — the actual mass/weight of the active peptide in the vial, so the mg on the label matches what's inside.
Sterility, endotoxin, and heavy-metal testing are available on request for specific batches.
Certificates of Analysis (COAs)
A Certificate of Analysis is available for every product we sell. COAs indicate purity and potency as of the date of testing — we cannot guarantee that future batches will produce identical results.
To request a COA for a specific product or batch, email info@polderpeptides.nl with the product name and (if you have it) the batch number.
Batch tracking
We track every batch from our supplier through testing to the vial you receive. If you have a question about a specific product, include the batch number (printed on the vial label) in your email and we can trace it back to the original COA.
Why testing matters
The gray-market peptide industry has a trust problem. Some suppliers underfill vials, sell impure product, or mislabel compounds. The only way to know what's in the vial is to test it independently — which is why we do exactly that, for every batch, before it goes on our shelf.
