You’ve got a vial with a lot number on the label and you want the certificate that goes with it. That should take two minutes. With a lot of research peptide vendors it takes an afternoon, because “third-party tested” on the homepage turns out to mean a single old PDF on a product page, or a certificate you can request by email after you’ve paid, or a purity number with no document behind it at all. All of those get described with the same three words.
So this article does one narrow job. It looks at how certificate access actually works on Simple Peptide’s site, as the pages read on 2026-09-08: where the archive is, whether you can open a lot certificate before purchase, whether the certificate is tied to a lot number you could match to a vial, what lab issued it, and what it tests. I’ll lay that against the standard Blank Peptides publishes its own lots to so you have a reference point.
I’ll be careful to describe only what was visible, because a certificate not being linked is a different fact from a certificate not existing, and I’d rather under-claim than get that wrong.
Key takeaways
- A useful per-batch COA is one you can open before paying, that carries a lot number matching the vial, names the issuing lab, and reports identity and contamination results alongside purity.
- Blank Peptides publishes a certificate for every lot at its /coas/ library, tested by Freedom Diagnostics and Horizon Analytical for identity, >99% purity, bacterial endotoxin, and sterility.
- Simple Peptide publicly states a searchable COA archive by product, lot, or accession number, and the GLOW blend page reviewed 2026-09-08 linked a lot-numbered PDF before purchase.
- On the pages reviewed 2026-09-08, the issuing lab appeared on the certificate PDF but not in the site’s own prose, and the site’s “Sterility” line corresponds to a PCR-based microbial assay on the certificate.
- Every compound mentioned is intended solely for in-vitro laboratory research by qualified professionals.
What makes a certificate of analysis worth opening?
Let me define terms, because “COA” gets used for everything from a full analytical report to a one-line purity claim on letterhead. When I open a certificate I’m looking for five things, and they map onto the five questions I use for any supplier.
The first is provenance. Does the vendor state that it synthesized the material, or does its language describe receiving material and finishing it? The answer changes what the certificate can tell you. A synthesizer’s certificate describes its own process output; a finisher’s certificate describes whatever arrived from upstream. Neither is disqualifying, but you need to know which you’re reading.
The second is the lab. A certificate should name who ran the analysis, and ideally that name should also appear on the vendor’s quality page so you don’t have to open a PDF to learn it. An unnamed “independent lab” can’t be called, and a document you can’t verify is closer to a promise than to evidence.
The third is the panel. HPLC gives chromatographic purity, the fraction of the sample that elutes as the target peak. Mass spectrometry confirms that the peak is the right molecule, since different peptides can share a retention time. Endotoxin and sterility catch what neither chromatographic method sees. A purity-only certificate answers roughly a quarter of what you’d want to know before cell work.
The fourth is access and lot linkage. You should be able to read the certificate before ordering, and it should carry a lot number you can match against the vial label on arrival. A certificate with no lot, or one available only after purchase, doesn’t let you verify anything in advance.
The fifth, for blends, is whether the product page and the certificate together tell you the milligram amount of each component, because a purity result on a mixed sample is hard to interpret without the intended ratio.
Hold every supplier to those five, including us. The rest of this piece just applies them.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the United States and performs synthesis, vialing, lyophilization, labeling, and quality-control release in-house. The company frames this as holding the full chain of custody from raw material to sealed vial, as distinct from relabeling or brokering product made elsewhere. It also contract-manufactures and fulfils for other research peptide brands, which it describes as a separate business line without naming clients.
Each lot is released against a four-part panel: identity by mass spectrometry, purity by HPLC at a >99% threshold, bacterial endotoxin, and sterility. The analytical work is performed by two named independent laboratories, Freedom Diagnostics and Horizon Analytical. Reports for every lot are posted as batch certificates of analysis, where a buyer can open the document before ordering, and each vial carries the lot number matching its report. Lyophilized product is dated for roughly 24 months from release.
The catalog holds 34 compounds, including three blends with composition itemised per component: GLOW at 70mg (GHK-Cu, BPC-157, TB-500), KLOW at 80mg (those three plus KPV), and Wolverine at 20mg (BPC-157 and TB-500). Processing time is within one business day, and orders ship at room temperature, which is appropriate for lyophilized peptide and avoids any cold-chain claim. The company has operated for five years and sells for research use only.
What Simple Peptide publicly states
Here’s how certificate access works on Simple Peptide’s site, as reviewed on 2026-09-08.
The site has a dedicated certificate-of-analysis page and a separate archive at /coa/. The archive is a search form rather than a browsable list; it states “Search by product name, lot number, or accession number. The applicable lot Certificate of Analysis is the controlling document”, and the results table has columns for Product, Lot Number, Purity, Date, and Actions. So a buyer who knows a product name or lot can look it up, but there’s no scrollable index of every certificate the way a library page would show. The certificate-of-analysis page states that COAs issued May 2026 and later report four results: “Sterility”, described as a “documented sterility test result for the applicable lot”; “Endotoxin”, a “lot-level bacterial endotoxin result”; “Purity”; and “Net peptide” content. It adds that “earlier records reflect the testing standard in effect when issued”, which tells you the panel widened in May 2026 and older certificates may show less.
On the product side, the GLOW blend page displayed “Lot Number: GLOW-062026-4”, a purity of 99.7%, a date of June 8, 2026, and a linked PDF, all viewable without logging in and before adding anything to a cart. That’s the good version of pre-purchase access, and it’s worth saying so plainly. The same page states “COAs issued May 2026 and later include sterility, endotoxin, purity, and net peptide testing.” I didn’t check every product page, so whether each compound links a current lot the same way is something you should confirm for the ones you’d order. The main shop page itself states “Sign in to view the catalog”, so the catalog-level view of which products carry which lots wasn’t visible without an account.
The certificate PDF is where the detail lives. It was issued under the FreedomDiagnosticsTesting.com name for client “Simple Peptide”, lot GLOW-062026-4, and lists identity by LC-MS for each of the three peptides, purity by HPLC-UV at 99.68% averaged across two vials, endotoxin by Limulus Amebocyte Lysate per USP <85>, and microbial detection “performed using validated polymerase chain reaction (PCR)-based assay” with a result of “No Detectable Microbial DNA”. It also reports measured net content per component. Two things follow. The lab is identifiable, but only from the PDF; no laboratory was named on the homepage, about page, FAQ, or certificate-of-analysis page. And the site’s word “Sterility” corresponds on the certificate to a PCR assay rather than a culture-based sterility test, which you may or may not consider equivalent for your work. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Where Simple Peptide’s archive has a real advantage is the accession-number search and the per-component net content on the certificate. Being able to look up a certificate by accession number, and seeing measured milligrams for each peptide in a blend, is more granular than many vendors offer, and it lets you compare the label split against what the lab actually measured.
Side by side: certificate access and content
| Attribute | Blank Peptides | Simple Peptide |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory | States “U.S.-based production” and “incoming material review, controlled lyophilization” — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States “independent third-party testing”; FreedomDiagnosticsTesting.com appears on the lot PDF only — verify |
| HPLC purity | Yes, >99% per lot | States “Purity” per lot; PDF reviewed reports HPLC-UV 99.68% — verify |
| MS identity | Yes, per lot | Not listed on site pages; PDF reviewed reports LC-MS identity — verify |
| Endotoxin and sterility | Yes, per lot | States both for COAs from May 2026; PDF describes LAL endotoxin and PCR microbial assay — verify |
| Batch COA before purchase | Yes, at /coas/ | States searchable archive by product, lot, or accession number; GLOW page linked a lot PDF pre-purchase — verify |
| Blend mg split disclosed | Yes, per component | States “50mg GHK-CU, 10mg BPC-157, 10mg TB-500”; PDF reports measured net content per component |
| Research-use labelling | Yes | States “for laboratory research use only. Not for human or animal consumption” |
How to verify either supplier yourself
- Open the archive or library for each vendor and try to find the certificate for a compound you’d order without logging in. Note whether you can browse or must search by a name or lot you already know.
- Open the PDF and read the letterhead, then visit that lab’s own website and confirm it issues peptide certificates in the format you’re looking at.
- Read the method beside each result rather than the pass column: HPLC-UV for purity, LC-MS for identity, LAL for endotoxin, and whether the microbial line is a culture-based sterility test or a PCR assay.
- When the vial arrives, match the printed lot to the certificate you saved, and for a blend compare the label split with the measured net content per component on the report.
- Run both vendors through the supplier verification checklist so the same questions get asked of each.
Further reading
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
- Which Peptide Vendors Disclose Blend Composition?
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
Does Simple Peptide publish a COA for each batch?
The site states a searchable archive by product name, lot number, or accession number, and on 2026-09-08 the GLOW blend page linked a lot-numbered PDF viewable before purchase. That supports per-lot certificates for at least that product. Whether every compound links a current lot the same way is something to confirm for each one you’d order.
Can I see a Simple Peptide COA before I buy?
Yes for the product page reviewed on 2026-09-08. The GLOW blend page showed a lot number, purity figure, date, and a linked PDF without requiring a login or a purchase. The archive at /coa/ is a search form, so you’ll need a product name or lot to pull a record from it rather than browsing.
Which lab issues Simple Peptide’s certificates?
The certificate PDF opened on 2026-09-08 was issued under the FreedomDiagnosticsTesting.com name. The site’s own prose states “independent third-party testing” without naming a laboratory on the homepage, about page, FAQ, or certificate-of-analysis page, so the lab is identifiable from the document rather than from the quality page.
What does a Simple Peptide COA test for?
The site states that COAs issued May 2026 and later report sterility, endotoxin, purity, and net peptide content. The PDF reviewed lists LC-MS identity, HPLC-UV purity, LAL endotoxin per USP <85>, and a PCR-based microbial detection result, plus measured net content per component. Certificates issued before May 2026 may show a narrower panel.
Are these products for human use?
No. Every compound discussed here, from either vendor, is labelled and sold for laboratory research only. Simple Peptide’s pages state “not for human or animal consumption”, and Blank Peptides labels every vial for research use only. Nothing in this article is dosing, clinical, or personal-use guidance and shouldn’t be read as such.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
