You went looking for a Pure Rawz COA and either found a dead page, an old PDF with a date that made you squint, or a blog post explaining how to read a certificate without actually showing you one. Now you’re not sure whether the certificates exist, whether they ever existed, or whether you’re just looking in the wrong place.
I’ve been down that same path on a lot of vendor sites, and the confusing part is that “lab tested” in a header and “here is the certificate for the lot in your hand” are two very different promises that get dressed up in the same badge. A site can be completely honest about the first while never getting around to the second.
So let’s look at what Pure Rawz actually publishes on its own domain as of September 2026, where it lives, whether it’s tied to a lot number, and whether you can see it before you spend anything. Then I’ll show you what a per-batch certificate library looks like when a manufacturer runs one, so you have something concrete to compare against.
Key takeaways
- A certificate is only as useful as its lot number, the lab that signed it, and whether you can read it before you pay.
- Blank Peptides publishes a batch certificate for every lot at blankpeptides.com/coas/, tested by Freedom Diagnostics and Horizon Analytical for identity, >99% purity, bacterial endotoxin and sterility.
- Pure Rawz publicly states, on the pages reviewed 2026-09-08, that its products are “third-party lab-tested compounds,” and that it is “an informational and affiliate website” that does not sell or supply them directly.
- A current certificate library, a named lab on current pages and endotoxin or sterility results were not listed on the Pure Rawz pages reviewed 2026-09-08; the /certificate-of-analysis/ page returned a 404.
- All compounds discussed are for in-vitro research use only, whatever any certificate says about them.
What makes a COA worth reading?
Before naming anyone, here’s the standard I’d hold every certificate to, and I’d apply it to ours the same way.
Start with provenance, because a certificate means something different depending on who commissioned it. A manufacturer that synthesizes its own material is certifying its own work. A site that sources finished vials is passing along someone else’s paperwork, which can still be fine, but you’d want to know that’s what’s happening, and the site should say so in plain words.
Second, the lab has to be named, and I mean an actual name with an address you could look up rather than “an ISO-accredited facility” or “our independent partner lab.” A certificate that never identifies who produced it amounts to a claim with a logo on it, and you can’t cross-check a logo.
Third, count the rows. HPLC purity tells you what fraction of the sample is the main peak. It doesn’t tell you that peak is the compound on the label, which is what mass spectrometry confirms. And neither of those says anything about bacterial endotoxin or sterility, which matter for any lyophilized product going into a lab. A certificate with only a purity row is answering one question out of four.
Fourth, and this is the one most people skip, is the certificate tied to a lot number that also appears on the vial, and can you see it before you buy? A certificate library you can only reach after checkout is a receipt. A certificate with no lot number is a marketing page. What you want is a document you can open today, for the specific lot that will ship to you, with a number you can match against the label when the box arrives.
Fifth, for blends, does the certificate or the product page state the milligrams of each component? A blended vial with one total mass on the label and no split is asking you to trust a ratio you can’t check.
Company age and domain age are deliberately off this list. A site that’s been up for ten years can publish nothing, and a site that launched last spring can publish everything, so I’d rather spend your attention on the documents themselves.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the USA and keeps every production step inside it. The company compounds each peptide, fills and lyophilizes the vials, applies finishing and labels, and runs quality control on site, so there’s no broker or relabeling stage between synthesis and shipment. The same facility contract-manufactures and fulfils for other peptide brands, which the company describes as a category of work rather than by naming any client.
Every lot is tested on a four-part panel: identity, >99% purity, bacterial endotoxin and sterility. Two outside laboratories are named for that work, Freedom Diagnostics and Horizon Analytical. The results are posted as batch certificates of analysis that anyone can open before ordering, and every vial carries a lot number that corresponds to a certificate in that library. Lyophilized product is given an expiration of roughly 24 months.
The catalog covers 34 compounds. Blends are published with a per-component milligram split: GLOW is 70mg total (GHK-Cu, BPC-157 and TB-500), KLOW is 80mg (adding KPV to the same three), and Wolverine is 20mg (BPC-157 and TB-500). Orders are processed within one business day and ship at room temperature. Everything is labeled for research use only, and the company has been in business for five years.
What Pure Rawz publicly states
Here’s what I found on the Pure Rawz site on 2026-09-08, and I’ll keep to what the pages themselves say.
The homepage states the products are “third-party lab-tested compounds” and refers to “independent third-party testing for purity and transparency.” Its meta description includes the phrase “COA verified.” Those are the testing claims on the current front page, and none of them names a lab or lists which tests are run.
Where would the certificates live? The site has a URL at /certificate-of-analysis/, which is the address indexed by search engines under the title “PureRawz Certificates Of Analysis.” On 2026-09-08 that page returned a 404 error. No link to a certificate page appeared in the navigation or footer of the homepage, the About page, the Terms page or the peptides category page on that date, and the product pages I opened for BPC-157 and for the BPC-157 + TB-500 blend didn’t show a certificate, a purity figure, an HPLC or MS reference or a lab name.
That said, the domain does still host older certificate PDFs under its uploads folder. One of them, for PT-141 lot PRWZ-083, is dated 2023-08-22, names MZ Biolabs with an address in Tucson, Arizona, states “Mass Spectrometry and UV” as the method and reports 99.5%. It has no endotoxin or sterility rows. So a lot-tied certificate from a named lab did exist on this domain at one point, which is more than many sites can show. But it’s three years old, it’s reachable only by direct URL, and nothing on the current pages connects it to anything you could buy today.
Which brings up the bigger context. The About page states, “We do not manufacture, stock, package, ship, or fulfill orders for the products discussed on this website,” and the Terms page states, “Purerawz does not sell any of the products featured on this website.” Product pages carry a “Read More” link rather than a cart and link out to external vendors the site names, each with a coupon code. If the site isn’t the one shipping the vial, a certificate on its domain would be describing someone else’s lot, and the site’s own pages don’t say whose. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
I’ll give the site credit where it’s earned. The blog carries “How to Read a Peptide COA (Real vs Fake)” and “Why Third-Party Testing Is Critical for Research Peptides,” and both are worth reading regardless of where you buy. And the peptides category lists 170 products, a far larger reference catalog than ours. As an educational index, it does a real job. As a source of per-batch certificates for a vial you’re about to order, the current pages don’t show one.
Side by side: certificate access
| Attribute | Blank Peptides | Pure Rawz |
|---|---|---|
| Synthesises in-house | Own cGMP laboratory, full chain of custody | States it does “not manufacture, stock, package, ship, or fulfill orders” |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | Not on current pages; a 2023 PDF names MZ Biolabs — verify |
| HPLC purity | >99% per lot, on every certificate | States “third-party lab-tested”; method not listed on current pages — verify |
| MS identity | Confirmed per lot | 2023 PDF states “Mass Spectrometry and UV” — verify |
| Endotoxin and sterility | Both on every certificate | Not listed on pages reviewed 2026-09-08 — verify |
| Batch COA before purchase | Public library at blankpeptides.com/coas/, lot number on vial | Certificate page returned 404 on 2026-09-08 — verify |
| Blend mg split disclosed | Per component on every blend | States “approximately 5 mg BPC-157 + 5 mg TB-500” as a common convention — verify |
| Catalog size | 34 compounds | States 170 peptide listings, linking to outside vendors |
How to verify either supplier yourself
- Type the certificate URL directly rather than trusting a badge, and note whether it loads, whether it’s linked from the navigation, and what date is on the newest document you can find.
- Match three things: the lot number on the certificate, the lot number on the product page or order confirmation, and the lot number on the vial when it arrives. If any of the three is missing, ask support for it in writing before you pay.
- Search the lab name independently of the vendor’s site, and if you’re serious about a large order, contact the lab and ask whether it issued that certificate.
- Count the rows on the certificate, and if identity, endotoxin or sterility are absent, ask why and whether the vendor can supply them for your lot.
- Run the whole thing against the supplier verification checklist so every vendor gets scored on the same sheet.
Further reading
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
- Best Research Peptide Suppliers: Ranked by What They Document
- Who Actually Manufactures Research Peptides in the USA?
Frequently asked questions
Does Pure Rawz publish a COA for each batch?
On the pages reviewed 2026-09-08, no current per-batch certificate library was listed, and the site’s /certificate-of-analysis/ page returned a 404. Older certificate PDFs from 2023 remain hosted on the domain by direct URL. That is not a claim the documents don’t exist, only that they weren’t publicly listed on the pages reviewed that day.
Which lab tested Pure Rawz products?
No lab is named on the current homepage, About, Terms or product pages reviewed 2026-09-08. A 2023 certificate PDF still hosted on the domain names MZ Biolabs for PT-141 lot PRWZ-083. Whether that lab is still used, and for whose lots, isn’t stated on the current pages, so you’d need to ask support directly.
Does a Pure Rawz COA include endotoxin and sterility?
The 2023 certificate I could open states “Mass Spectrometry and UV” and a purity result, with no endotoxin or sterility rows. Endotoxin and sterility results were not listed on any Pure Rawz page reviewed 2026-09-08. If those matter for your work, request them for the specific lot before ordering from any vendor.
Can I see a certificate before buying?
Pure Rawz states it doesn’t sell products directly and links to outside vendors, so the certificate that matters would come from whichever vendor ships your vial. Ask that vendor for the lot-tied certificate before checkout. Blank Peptides publishes its certificates in a public library at blankpeptides.com/coas/ so they can be read before an order is placed.
Are these products for human use?
No. Every compound mentioned here, from any supplier, is intended for in-vitro laboratory research by qualified professionals. A certificate of analysis describes what is in a vial and says nothing about suitability for any use outside a laboratory, and nothing in this article is medical advice or a recommendation of any kind.
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.
