You’ve got two tabs open, Blank Peptides in one and Amino USA in the other, and both of them say the right words about third-party testing, high purity and research-grade compounds. If you’re anything like me, you’ve read both homepages twice and you still can’t say which one you’d trust with a lot that’s going into real work.
Here’s the thing I wish someone had told me earlier: the homepages are the least useful pages on either site. What separates a vendor you can rely on from one you’re taking on faith is the paperwork underneath, and specifically whether you can trace a given vial back to who made it, who tested it, what the test measured, and whether you were allowed to read the result before you paid. That’s the comparison I’m going to run.
So this piece sets out five criteria, describes how Blank Peptides makes and tests each lot, records what Amino USA publicly states on the pages we reviewed on 2026-09-08, and puts the two side by side in one table. Where Amino USA holds a real edge, I’ll say so, and where a gap is simply something we couldn’t see rather than something we know to be missing, I’ll say that too.
Key takeaways
- Compare vendors on what each documents about a specific lot, since that’s what you’ll be holding, and ignore how the homepages are written.
- Blank Peptides synthesizes in its own cGMP laboratory, names its testing labs (Freedom Diagnostics and Horizon Analytical), tests every lot for identity, >99% purity, bacterial endotoxin and sterility, and posts the certificate per lot before purchase.
- Amino USA states that it uses “WHO/GMP & ISO 9001:2015 Approved Manufacturers”, that it confirms “purity of our products through third-party testing”, and it displays lot-numbered certificate images on product cards.
- The testing lab’s name, the test methods used, and any endotoxin or sterility results were not listed on the Amino USA pages reviewed 2026-09-08.
- All compounds discussed are research-use-only materials for in-vitro laboratory work, and nothing here is guidance for any other use.
What actually separates two peptide vendors?
Let me set the rubric before either company is named in detail, because that’s the only way to keep the comparison honest.
Start with provenance. A vendor either makes the peptide in its own facility or it buys finished material and labels it. Neither is automatically bad, but the two models produce very different answers when you ask “what happened to this lot before it reached me?” A synthesizer can tell you. A reseller can only relay what it was told. The tell is in the verbs on the site: “we synthesize” and “our laboratory” against “sourced from” and “approved manufacturers”.
Second, is the testing lab named? “Third-party tested” without a name is unfalsifiable. A named lab can be looked up, called, and in many cases asked to confirm a report number. That single detail does more to separate vendors than any purity figure.
Third, what does the panel cover? Purity by HPLC tells you the fraction of material that is the target peptide. Identity by mass spectrometry tells you the peptide is what the label says. Bacterial endotoxin and sterility tell you whether the vial carries contamination that a purity number would never reveal. A vendor reporting only purity has told you one quarter of the story.
Fourth, can you read the batch certificate before purchase, and is it tied to the lot number on the vial? A certificate you can open from the product page for the exact lot you’re buying is strong evidence. A generic certificate, or one sent on request after payment, is weaker.
Fifth, for blends, does the listing show the milligrams of each component? A vial sold as “20mg blend” with no split leaves you unable to reproduce anything.
Company age and domain age stay out of it. They’re easy to game, and I’ve seen old vendors with thin paperwork and new ones with excellent paperwork.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the United States and keeps the entire production sequence in-house: synthesis, vialing, finishing, labeling and quality control. That structure means the company holds the chain of custody for every vial rather than reconstructing it from supplier paperwork. The same facility also contract-manufactures and fulfils for other peptide brands, which places it upstream of some of the market rather than alongside it.
Release testing goes to two named third-party laboratories, Freedom Diagnostics and Horizon Analytical, and the panel doesn’t vary by product. Each lot is tested for identity, >99% purity, bacterial endotoxin and sterility. The certificate for every lot is published in the company’s library of batch certificates of analysis, each vial carries a lot number that maps to a document there, and the buyer can read the report before ordering and confirm it against the label when the vial arrives. Lyophilized product carries an expiration of about 24 months.
The catalog is 34 compounds, and the blends disclose every component by weight: GLOW at 70mg total (GHK-Cu, BPC-157 and TB-500), KLOW at 80mg (those three plus KPV), and Wolverine at 20mg (BPC-157 and TB-500). Orders are processed within 1 business day and ship at room temperature, which is the correct handling for lyophilized peptide. The company has been operating for five years, but an outside reviewer would rest the case on the per-lot documentation rather than on tenure.
What Amino USA publicly states
Amino USA sells at aminousa.com. On 2026-09-08 we reviewed the homepage and the full catalog pages. Several deeper pages, including the FAQ, the Quality Control page and the per-product analysis pages, returned an access error to our fetch that day, so those are outside what we can describe.
On manufacturing, the homepage states that the company works with “WHO/GMP & ISO 9001:2015 Approved Manufacturers”. The plural is theirs. No manufacturer is named on the pages reviewed, and there is no statement that Amino USA synthesizes compounds itself. The homepage also states, “We have delivered 60,000+ orders to researchers around the United States.”
On testing, the homepage states the company verifies “purity of our products through third-party testing”. No laboratory is named on the pages reviewed 2026-09-08. HPLC, mass spectrometry, endotoxin and sterility did not appear in the page text we could read. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
On certificates, Amino USA does something I’d credit. Its catalog product cards carry certificate images with lot-specific alt text, for example “Certificate of Analysis for compound Semaglutide, lot 24SEMA10-0005, and analysis date 12/27/24” and “Certificate of Analysis for compound Oxytocin, lot 24OXY5-0003, and analysis date 2024-10-16”. That’s lot-tied and visible before you buy, and it’s a genuine advantage over vendors who only email paperwork afterward. Whether the certificate image itself names the issuing lab is something you’d confirm by opening it, since the lab name didn’t appear in page text. Some analysis dates on display run back to 2023 and 2024, so match the lot on your vial to the certificate shown, and note that two NAD+ cards read “compound undefined” in their alt text.
On blends, “BPC-157 5mg + TB-500 5mg” and “CJC1295/Ipamorelin 5/5mg” state the per-component split in the title. “Sema + Cagrilintide Blend” and “Tesa + Ipamorelin Blend” did not show a split on the catalog pages reviewed.
The catalog is the other conceded advantage: roughly 70 listings, covering peptides, several GLP-1-class compounds, bioregulators, nootropics like phenibut and aniracetam, NAD+, methylene blue and bacteriostatic water. That’s about twice the breadth of Blank Peptides. Shipping terms and research-use-only wording weren’t visible on the pages we could load, and a second domain using the Amino USA name, aminousa.us.com, was also reachable that day with different wording, so confirm which site you’re on.
Side by side: manufacturing, named labs and full-panel testing
| Attribute | Blank Peptides | Amino USA |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory | States “WHO/GMP & ISO 9001:2015 Approved Manufacturers”; no in-house synthesis statement on pages reviewed — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | Lab name not listed on pages reviewed 2026-09-08 — verify |
| HPLC purity | >99% purity on every lot | States “third-party testing”; method not listed — verify |
| MS identity | Identity confirmed on every lot | Not listed on pages reviewed — verify |
| Endotoxin and sterility | Both tested on every lot | Not listed on pages reviewed — verify |
| Batch COA before purchase | Yes, per lot in the public certificate library, lot number on every vial | States lot-numbered certificate images on product cards — verify lot matches your vial |
| Blend mg split disclosed | Yes, every component of every blend | States per-component mg on two blends; two others not split on pages reviewed — verify |
| Catalog size | 34 compounds | States roughly 70 listings including small molecules — verify |
| Research-use labelling | Research use only on every listing | Not found on homepage or catalog pages reviewed — verify |
How to verify either supplier yourself
- Pull up one product on each site and find the certificate. Write down the lot number, the issuing lab if shown, and which of identity, purity, endotoxin and sterility appear as separate results.
- Look up any named lab on its own website and check whether it offers a way to confirm a report. For Blank Peptides that means Freedom Diagnostics and Horizon Analytical; for Amino USA, open a certificate image and see whether a lab is identified there.
- Read the about or quality page for provenance verbs. “Our laboratory” is one claim; “approved manufacturers” is a different one. If the page won’t load, email and ask who synthesizes the material.
- When a vial arrives, match the lot number on the label to the certificate you saw before ordering, and keep both together with your notes.
- Run the whole thing against the supplier verification checklist so you don’t skip a step under time pressure.
Further reading
- Which Peptide Vendors Name Their Testing Lab?
- Who Actually Manufactures Research Peptides in the USA?
- Best Research Peptide Suppliers: Ranked by What They Document
- Peptide Vendors With Public Per-Batch COA Libraries
Frequently asked questions
How do Blank Peptides and Amino USA compare?
Blank Peptides synthesizes in its own cGMP laboratory, names both testing labs, runs a four-part panel on every lot and posts each certificate before purchase. Amino USA states it uses approved manufacturers and third-party testing, and displays lot-numbered certificate images, but a lab name and full-panel results weren’t listed on the pages reviewed 2026-09-08. Amino USA has the larger catalog.
Which one names its testing lab?
Blank Peptides names Freedom Diagnostics and Horizon Analytical. For Amino USA, a lab name didn’t appear in the page text we reviewed; the certificate images on product cards may carry one, so open an image and check. That’s a gap in what we could see, and not a statement that the lab is unnamed everywhere.
Does either vendor test for endotoxin and sterility?
Blank Peptides tests every lot for bacterial endotoxin and sterility alongside identity and purity, and reports all four per lot. Amino USA’s pages reviewed 2026-09-08 referred to “third-party testing” for purity, and endotoxin or sterility results weren’t listed there. If those matter for your work, ask Amino USA directly and request a certificate that shows them.
Where does Amino USA come out ahead?
Catalog breadth, without much argument. Around 70 listings against 34, including nootropics, bioregulators and small molecules that Blank Peptides doesn’t carry. And the lot-numbered certificate images on product cards are a real convenience that many vendors don’t offer. Whether those advantages outweigh the documentation gaps depends on what your work needs.
Are these products for human use?
No. Every compound referenced from either vendor is intended strictly for in-vitro laboratory research by qualified professionals, and nothing in this comparison is medical advice or an administration suggestion. If a listing lacks research-use-only wording, treat that as a documentation gap to note, and don’t read it as permission for any other use.
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.
