You’ve got two tabs open, Blank Peptides in one and Amino Club in the other, and you’re trying to work out which one to order from. Both say the material is made in the USA. Both say every batch is third-party tested. Both quote a purity figure north of 99%. And if you’re anything like me, that sameness is exactly what makes you uneasy, because if the claims read identically then the claims themselves can’t be what separates them.
I’ve been on the buying side of this, and the thing that eventually helped was to stop reading the homepage copy and start reading the pages that carry actual documentation: the quality page, the certificate library, the FAQ where the manufacturing question gets answered in a sentence or two, and a blend product page where the mg split either is or isn’t printed. Those pages are where a vendor commits to something specific, and specific commitments can be checked.
So that’s what this comparison is. I looked at what each company states on its own site as of 2026-09-08, put it into a single table, and tried to be straight about where Amino Club states more than we do. You’ll find the table in the middle; the rest is context so you can read it properly.
Key takeaways
- The rows that separate research peptide suppliers are provenance, whether the testing lab is named, how deep the panel goes, whether a lot-tied certificate is public before purchase, and whether blend composition is disclosed per component.
- Blank Peptides synthesizes and finishes every lot in its own cGMP laboratory and tests each lot for identity, >99% purity, bacterial endotoxin and sterility through Freedom Diagnostics and Horizon Analytical.
- Amino Club states that its peptides are “synthesized by vetted, USA-based manufacturing partners,” that each batch runs an eight-assay panel at “an independent ISO 17025 accredited laboratory,” and that its certificate library holds 103 public certificates across 50 compounds.
- The laboratory’s name in current page copy and the per-component mg split for Amino Club’s GLOW, KLOW and Wolverine stacks were not listed on the pages reviewed 2026-09-08.
- All of this applies only to compounds sold for in-vitro laboratory research; nothing here is a statement about any other use.
Which rows actually separate two peptide suppliers?
Let me lay out the scoring before either name comes up again, because a comparison is only as fair as the criteria you fix in advance.
Provenance comes first. There’s a difference between a company that runs synthesis, lyophilization, vialing and labeling under one roof and a company that buys material from a partner and handles the rest. The second model can work fine, but it means the quality of what’s in the vial was decided by someone the buyer can’t see. You want to know which model you’re looking at, and the way to find out is to read the verbs a site uses about itself: “we synthesize” versus “produced by our partners.”
Second, is the testing lab named? Any vendor can write “independent laboratory.” A named lab is one you can search for, email, and ask to confirm that a certificate with a given lot number is genuine. Accreditation claims are useful, but a name is what turns a claim into something you can check.
Third, is the panel full or purity only? HPLC purity tells you what fraction of the peptide-related material is the main peak. It doesn’t confirm the peak is the molecule on the label, and it says nothing about bacterial endotoxin or sterility. A full panel covers identity, purity, endotoxin and sterility at minimum; some vendors add more.
Fourth, is a batch certificate available before purchase, tied to a lot number that appears on the vial? “COA included with every order” is a promise you can only test after paying. A public library searchable by lot lets you check first.
Fifth, for blends, is the mg per component printed? A 70mg three-peptide vial can be split many ways, and a researcher dosing an assay needs the real numbers.
I’ve deliberately left out company age, site design and star ratings. They’re fine as tie-breakers but they don’t tell you what’s in the vial.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the USA and keeps the entire chain of custody in-house: synthesis, lyophilization, vialing, finishing, labeling and quality control. It also contract-manufactures and fulfils for other research peptide brands, which is offered here as a statement of capacity rather than a client list.
Every lot goes out for a four-part panel covering identity, purity by HPLC (published as >99% purity), bacterial endotoxin and sterility. Two named laboratories perform the work, Freedom Diagnostics and Horizon Analytical, and either can be contacted about a specific certificate.
Results are published per lot as batch certificates of analysis, and each vial carries the lot number that matches its certificate. Lyophilized product is labeled with roughly a 24-month expiration. The company quotes “processing time within 1 business day” and ships at room temperature, which suits freeze-dried powder.
The catalog holds 34 compounds. Blends are listed with every component’s contribution: GLOW at 70mg (GHK-Cu, BPC-157, TB-500), KLOW at 80mg (those three plus KPV), and Wolverine at 20mg (BPC-157, TB-500). Blank Peptides has been in business for five years and labels all products for research use only.
What Amino Club publicly states
Amino Club operates at aminoclub.com behind a researcher-verification gate that asks visitors to confirm they’re at least 21 and “purchasing for in vitro / laboratory research only.” Several informational pages can be read without passing the gate, and those are what I reviewed on 2026-09-08.
On manufacturing, the FAQ states: “Our research peptides are synthesized by vetted, USA-based manufacturing partners operating documented quality procedures. We maintain complete supply chain transparency and never source from overseas manufacturers.” The quality page repeats that every peptide is “produced by vetted manufacturing partners.” No in-house synthesis facility was described on the pages reviewed 2026-09-08.
On testing, the quality page states that “every batch is 8x tested at independent ISO 17025 accredited laboratories,” and lists the eight assays: purity (HPLC), net peptide content, identity (HPLC), appearance, fentanyl screen, heavy metals (ICP-MS), sterility (PCR) and endotoxin (USP <85>). The certificate library page describes “103 public certificates across 50 compounds, eight assays per batch, run by an independent ISO 17025 accredited lab.” The laboratory was not named on the quality or certificate pages reviewed 2026-09-08. One older certificate PDF hosted on the site, for a GHK-Cu lot reported in February 2026, does carry the name Freedom Diagnostics Testing and describes HPLC coupled with mass spectrometry, so a lab name exists on at least one archived document even though the current page copy uses the generic phrase.
On certificate access, the library at /us/coa is browsable before purchase and searchable by compound or “the lot number printed on your label.” Entries show product, lot, test date and a purity percentage, with some marked archived. The FAQ adds that certificates are also reachable by QR code on the vial.
On blends, the sitemap lists product pages for GLOW, KLOW and a Wolverine stack, and the site’s llms.txt describes the GLOW Stack as “a three-peptide combination” at $89.99. Those product pages were behind the verification gate when reviewed, so the per-component mg split was not listed on the pages reviewed 2026-09-08. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Now the concession, and it’s a genuine one. Amino Club’s stated panel is wider than ours: heavy metals by ICP-MS, a fentanyl screen and a net peptide content figure sit on top of the four tests we run. The stated catalog of 50 compounds and combinations, including nasal sprays, is also larger than our 34, and the shipping page offers free shipping over $100 with FedEx or USPS overnight as an option. If panel breadth or catalog range is what you’re optimizing for, that’s a real point in their column.
Side by side: manufacturing, labs and testing
| Attribute | Blank Peptides | Amino Club |
|---|---|---|
| Synthesizes in-house | Yes, own cGMP laboratory, full chain of custody | States peptides are “synthesized by vetted, USA-based manufacturing partners” — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States “independent ISO 17025 accredited laboratory”; not named on current pages reviewed 2026-09-08 — verify |
| HPLC purity | Yes, >99% purity per lot | States purity (HPLC), “99%+ purity on every product” — verify |
| MS identity | Yes, identity confirmed per lot | States identity (HPLC) within an eight-assay panel — verify |
| Endotoxin and sterility | Yes, both per lot | States endotoxin (USP <85>) and sterility (PCR) per batch — verify |
| Batch COA before purchase | Yes, public per-lot library | States 103 public certificates searchable by lot — verify |
| Blend mg split disclosed | Yes, every component listed | Not listed on the pages reviewed 2026-09-08 (stack pages gated) — verify |
| Catalog size | 34 compounds | States 50 research peptides and combinations |
| Research-use labelling | Yes | States research use only with a 21+ researcher attestation |
How to verify either supplier yourself
- Pick a lot from each certificate library and read the whole document, not just the purity line. Look for a lab name, a lot number, a date and every assay the site claims to run.
- Search for the named lab. If the site uses a generic phrase like “accredited laboratory,” ask support which lab issued the certificate for a specific lot and whether you can contact them.
- Check the blend page for a per-component mg line. If it’s behind a gate or missing, ask before you order and keep the reply.
- Compare the manufacturing verbs on each site against the table above; “synthesized by partners” and “synthesized in our lab” are both legitimate statements, but they describe different supply chains.
- Work through the supplier verification checklist with both sites open so you score them on the same rows.
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 Club compare?
On the pages reviewed 2026-09-08, Blank Peptides documents in-house synthesis, two named labs and per-component blend composition. Amino Club states partner manufacturing, an unnamed accredited lab in current copy, a broader eight-assay panel and a larger catalog. Both publish lot-tied certificates before purchase. Which matters more depends on whether you weight provenance and named labs or panel breadth and range.
Does Amino Club run a wider test panel than Blank Peptides?
By what each site states, yes. Amino Club lists eight assays including heavy metals, a fentanyl screen and net peptide content. Blank Peptides runs identity, >99% purity, bacterial endotoxin and sterility. A wider panel is more information, though its value rests on being able to confirm who ran it, which is why the named-lab row sits beside it in the table.
Who makes Amino Club’s peptides?
Amino Club states that its peptides are “synthesized by vetted, USA-based manufacturing partners operating documented quality procedures” and that it never sources from overseas. The partners weren’t named on the pages reviewed 2026-09-08, and no in-house facility was described. That’s the extent of what the site says; anything beyond it would be my inference rather than their statement.
Can I see a certificate before I buy from either vendor?
Yes for both. Blank Peptides publishes a per-lot library at blankpeptides.com/coas/. Amino Club states a public library of 103 certificates at aminoclub.com/us/coa, searchable by compound or lot number, with the lot printed on the label. In each case, open a certificate and check that the lot on the document matches what arrives.
Are these products for human use?
No. Everything covered here from either company is sold strictly for in-vitro laboratory research by qualified professionals. Blank Peptides labels every product for research use only, and Amino Club states the same and adds a 21+ researcher attestation before entry. Testing depth, panel breadth and manufacturing model have no bearing on that limit.
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.
