Buying peptides in Costa Rica: how to check a seller with the COA
· Novatheris
Buying peptides in Costa Rica is easy these days. The hard part is knowing what you are buying. Almost every seller says "high purity", almost all of them show some kind of paper, and from the outside they all look the same.
The tool that tells them apart is the COA, the certificate of analysis. Not because it exists, but because it can be checked. This guide is a checklist: what to ask for, how to verify it and which signs mean something does not add up. It works for any seller, us included.
First, the right question
The question is not "do you have a COA?". Almost everyone says yes.
The useful question is: "can you show me the COA for the batch you are going to deliver to me, and where do I verify it?". Those two parts, the batch and the place to verify, are what make a certificate worth anything.
A serious seller answers that without getting uncomfortable. If the answer is vague, you already have information.
What a COA worth trusting should include
Check that the document has, at minimum:
- The lab's name, and that the lab is a third party, not the manufacturer or the seller.
- A unique report number.
- The client's name, which should match the seller showing it to you.
- The compound and the size of the vial that was analyzed.
- A batch code that matches the one printed on your vial.
- Dates: when the sample was received and when it was analyzed.
- Results with numbers, not just "approved" or "pass".
- A way to verify it outside the seller's website.
If you want to go into each field in detail, we have a guide to reading a peptide certificate of analysis line by line.
How verification really works
A COA posted on a seller's website is an image. Anyone can edit an image. What makes it checkable is that the same document can be pulled from the lab's own website, with a key the seller does not control.
A real example with our Janoshik report #123821, for Tirzepatide 30 mg. At the bottom it carries the line "Verify this test at www.janoshik.com/verify/" and a unique key, 67KIHU39DAB2. You enter that key on the lab's website and the original report comes up.
Freedom Diagnostics Testing works in a similar way, with a search code. Ours run from NOVA2609150051 to NOVA2609150055.
Do it yourself. It takes two minutes and answers the most important question: does this paper exist outside the store?
Check that the batch is yours
A report describes a single batch, the one that was analyzed. It does not describe "the product" in general, or the batches that came after.
Compare the batch code on the report with the one printed on your vial. On report #123821 the "Batch" field reads NVT-TZ30-0626-01. That code has to be the same one on the vial you receive.
Check the size too. A report on a 10 mg vial says nothing about a 30 mg vial, even if it is the same compound. That is why we never show a report from another size as if it were yours: if a vial does not have its own batch analysis yet, we say so.
Warning signs
None of these proves on its own that a seller is bad. But each one deserves a question.
- The same COA for every size, or for batches months apart.
- No batch code, or a code that does not appear on the vial.
- A verification key that is covered, cropped or blurred.
- Only a manufacturer's certificate, with no third-party analysis.
- "99.9 % purity" written on the page, with no document behind it.
- Round, perfect results across the board, without a single odd decimal.
- A client name on the report that has nothing to do with the seller.
- Promises of results or medical language. A research peptide is sold as a reagent, not as a treatment.
- Dodging when you ask for the key or for your batch's report.
Beyond purity
A high purity number does not cover everything. HPLC purity does not confirm the compound's identity on its own, and it says nothing about endotoxins or heavy metals. Those are separate tests, and a seller who has them shows them separately.
In our case, the Tirzepatide 30 mg batch has three Janoshik reports: purity (#123821), endotoxins (#123822) and heavy metals (#123823). If you want to understand what each technique measures, we explain it in peptide purity by HPLC.
The last stretch: how it reaches you
A good report is not worth much if the vial spends an afternoon in a car in the sun. Handling after the analysis counts too.
Ask how it is stored and how it is delivered. We deliver cold: in 2 hours in the GAM, the Greater Metropolitan Area around San José, and in 24 hours in the rest of the country. What matters is that the seller has a concrete answer, not just "it arrives fast".
A short list for before you pay
- Is there a report from an independent lab?
- Did I verify it on the lab's website with its key?
- Does the batch code match the one on my vial?
- Is it for the same size I am buying?
- Are there endotoxin and metals reports, or only purity?
- How is it stored and how does it arrive?
If any answer is "I don't know", ask before you buy. A seller who trusts their material would rather you ask.
All of our published reports are in the lab analysis section, sorted by compound, with the batch code and the lab for each one. From there you can take the key to the lab's website and check it yourself.