Why the Certificate of Analysis Matters, and What We Now Test Ourselves at Liquilabs
What a Certificate of Analysis really tells you, the difference between a manufacturer CoA and an independent test, and the full safety panel we now run at Liquilabs.
A research peptide is only as good as the evidence behind it. The single most important document for that is the Certificate of Analysis (CoA), the lab report for a specific batch. But not every CoA says the same thing, and most cover less than buyers assume. This article explains what a CoA actually proves, where its limits lie, and what we have recently started commissioning ourselves on top: an independent test at Liquilabs in Prague, verifiable online.
TL;DR: What this is about
Manufacturer CoA: typically proves identity and purity (HPLC) of the tested batch.
What HPLC purity is NOT: it measures organic impurities, not the actual peptide content, no heavy metals, no endotoxin, no microbiology.
Our step: we now commission a full safety panel ourselves at Liquilabs (Prague), including heavy metals (ICP-MS), endotoxin (LAL) and microbiology, verifiable online.
Status: we are rolling this out batch by batch, starting with the first three products. Not every product is independently tested yet.
What a Certificate of Analysis is
A CoA is the lab report for one specific production batch. In the peptide field it usually comes from an independent testing lab such as Janoshik Analytical and reports two key figures:
- Identity: Is the molecule actually the stated peptide? Confirmed by mass spectrometry and retention time.
- Purity: What share of the material is the target peptide versus organic byproducts? Measured by HPLC, given as a percentage.
The CoA is batch specific. A purity figure from one batch says nothing about another. That is why we publish the CoA with batch number and test date on every product page, and recently with a one-click verify link straight to the lab.
The catch: HPLC purity is not everything
A high HPLC purity sounds reassuring, but it only answers part of the question. Three common misunderstandings:
- Purity is not content. 99 percent purity means: of whatever is present in the vial as peptide, 99 percent is the target molecule. It does not tell you how many milligrams are actually in there. A separate assay (content) measures that.
- Purity is not safety. HPLC sees organic impurities. It does not see heavy metals, bacterial endotoxin or microbial contamination.
- A manufacturer CoA is not commissioned by us. It comes through the manufacturer's supply chain. We publish it transparently, but we did not commission it ourselves.
Important: purity is only one dimension
An HPLC purity of 99 percent is a good sign, but not the full picture. It reflects organic impurities, not the peptide content and not contaminants such as heavy metals or endotoxin. A complete picture needs several mutually independent tests.
Two layers of testing, full transparency
We deliberately rely on two clearly separated layers:
- Manufacturer third-party CoA (Janoshik): comes with every batch, covers identity and purity, verifiable online. This is the industry standard, and we keep it.
- Our own independent test (Liquilabs): we send selected batches ourselves to a separate EU lab for a full safety panel. Here we are the client, and the results can be checked online on the lab's server.
Why this matters in the EU
The gray peptide market runs on claims without evidence. Our approach is the opposite: one manufacturer CoA per batch, plus our own independent panel test on top, both verifiable online. You do not have to take our word for it, you can check it.
What Liquilabs tests for us
Liquilabs is an independent lab in Prague. There we commission a full safety panel for selected batches, going well beyond identity and purity.
The panel in detail
Identity: UHPLC plus orthogonal LCMS confirmation.
Purity and content: UHPLC, in percent and in milligrams.
Microbiology: total viable count and yeasts/molds per USP <61> / Eur. Ph. 2.6.12.
Endotoxin: bacterial endotoxin (LAL) per USP <85>, given in EU/mg.
Heavy metals: arsenic, cadmium, mercury, lead and others by ICP-MS per USP <232> / Ph. Eur.
The first results are in and published on our Reports page. For the first three batches the safety panel was clean throughout: high purity, no microbial growth, endotoxin below 0.001 EU/mg and no detectable heavy metals.
Products we have already tested ourselves
The first independent Liquilabs reports are available for these products. Each report can be checked via the verify link on the product page and on the Reports page.
3-in-1 skin peptide blend: GHK-Cu 50mg + BPC-157 10mg + TB-500 10mg. Targets collagen synthesis, tissue regeneration, and skin repair for comprehensive dermatological research.
2-in-1 growth hormone blend: CJC-1295 no-DAC (Modified GRF 1-29, 5 mg) + Ipamorelin (5 mg) combined in one vial. The CJC-1295 component is the short-acting no-DAC variant (about 30 minute half-life), not the long-acting DAC form. Stimulates natural GH release through two different pathways for amplified, more physiological growth hormone pulses.
How to read and verify a CoA yourself
Match the batch
Check that the batch number or color code on the vial matches the CoA on the product page. The CoA only ever applies to exactly that batch.
Identity first
Look for the identity confirmation (mass spectrometry, retention time). Without confirmed identity, a purity figure is meaningless.
Purity in context
Read the HPLC purity as a measure of organic impurities, not as content and not as safety.
Verify online
Use the verify link to open the report directly on the lab's server. A result that cannot be checked externally remains a claim.
Look for the full panel
For maximum information value, look for microbiology, endotoxin and heavy metals, not just a purity figure.
Limits, stated honestly
We are rolling out independent testing batch by batch. Not every product and not every batch is independently tested yet, and the golden verify badge only appears for the batches Liquilabs has actually tested for us. None of the labs involved are ISO 17025 accredited. All products are intended exclusively for laboratory research, not for human or veterinary use.
Bottom line
A CoA is the foundation, but a single HPLC purity result is only a snapshot. Identity, content, microbiology, endotoxin and heavy metals together are what form the complete picture. That is exactly why we now complement the manufacturer CoAs with our own independent Liquilabs panels, verifiable online, rolled out batch by batch. You can find the current status and all reports on our Reports page.
For laboratory research only. Not for human or veterinary use. This article is not medical advice.
Research context for English-speaking buyers
Most of our English-speaking customers ship to the UK, Ireland, Malta or other English-as-second-language EU territories. The regulatory picture differs per country.
- Relevant authorities
- MHRA (UK, post-Brexit), HPRA (Ireland, EU-aligned), FDA Section 503A bulks list (US, restricted Cat 2 status of several peptides as of 2026)
- Customs and VAT
- EU shipments include 19% VAT; UK shipments after Brexit are now extra-EU and may attract UK VAT plus a handling fee at import
- Typical shipping window
- EU 2-4 working days, UK 4-7 working days, other international 7-14 working days, depending on customs
Research-grade peptides shipped from our EU warehouse are sold for laboratory use only and are not authorised for human or veterinary therapeutic application in any of the destination jurisdictions. US customers should be aware that the FDA Section 503A bulks list classification (and the April 2026 reclassification of twelve compounds) only governs compounding pharmacies, not direct-to-researcher imports for non-clinical work. UK buyers should declare the consignment on import and may be asked for a research justification by HMRC. We provide a CoA per batch identified by colour code rather than serial number; customs sometimes asks for this document when clearing the parcel.