You’ve got two tabs open. One is Blank Peptides, the other is Amino Science Labs, and both of them say the product is lab tested at 99% or better. You’re trying to figure out whether there’s a real difference underneath that or whether you’re just choosing between two shades of the same claim, and the sites aren’t helping because the badges on the homepage are basically interchangeable.
I get the frustration, because I’ve done this exact comparison for a lot of vendor pairs and the surface layer really is the same everywhere. The differences only show up when you go one level down: the certificate itself, the verbs the company uses to describe what it does, and whether the numbers on a blend certificate reconcile with the label. That’s where this post lives.
So I’m going to compare these two on documentation only. What each one makes or says it makes, which lab is named, what tests are actually on the certificate, whether you can read a lot-tied COA before you pay, and what a blend page tells you about what’s inside. Everything I say about Amino Science Labs comes from the pages I reviewed on 2026-09-08 and is attributed to what the site states, and I’ll point out the places where they come out ahead too, because there are some.
Key takeaways
- Comparing peptide vendors on published documentation is the only method that survives contact with two sites making identical purity claims.
- Blank Peptides synthesizes and finishes every lot in its own cGMP laboratory, tests each for identity, >99% purity, bacterial endotoxin and sterility through Freedom Diagnostics and Horizon Analytical, and posts a lot-numbered COA.
- Amino Science Labs publicly states it is “a chemical supplier”, that every batch is tested by “accredited U.S. laboratories”, and links lot-numbered Freedom Diagnostics certificates showing HPLC-UV purity and LC-MS identity.
- A manufacturing description, endotoxin and sterility results, and a per-component mg split on the blend product pages were not listed on the Amino Science Labs pages reviewed 2026-09-08.
- All of this concerns research-use-only material for in-vitro work, and neither vendor’s paperwork alters that.
What actually separates two peptide suppliers?
Let me set the rubric before I put either name in a table, because the rubric is the argument.
Provenance comes first. A supplier either synthesizes the peptide or it buys finished material from someone who does. The distinction matters because it decides who can answer questions about the lot. If a vendor made it, they can tell you the synthesis route, the lyophilization conditions, the fill weight. If they bought it, they can pass along what they were told. You find out which case applies by reading how the vendor describes itself, and not by reading the product page, which will say “premium” either way.
Second, is the testing lab named? “Independently tested” is unfalsifiable on its own. A named lab lets you open the lab’s own site, compare certificate formats, and see whether the vendor’s certificates look like everyone else’s from that lab. It also tells you the vendor is willing to be checked.
Third, the panel. HPLC purity is a percentage of the chromatogram under the main peak. Mass spec identity confirms that the main peak has the right mass. Bacterial endotoxin and sterility are separate assays that tell you whether the vial is fit for a cell-based assay. A certificate with purity alone is a quarter of the picture, and a certificate with purity plus identity is half.
Fourth, COA access. Can you download a lot-numbered certificate before purchase, and does that lot number appear on the vial when it arrives? Anything less means you’re choosing first and verifying later, which is backwards.
Fifth, blends. If a product is three peptides in one vial, the mg of each should be on the product page and on the certificate, and the two should match. If the split is only on one of them, or on neither, you can’t compare that blend to anything.
I’d add one thing I deliberately leave off the rubric: how long a company has existed. Age tells you nothing about what’s in the vial. Documentation does.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the USA and performs the entire production chain in-house. Synthesis, vialing, lyophilization, finishing and labelling happen at one facility, and quality control is run there before any lot is released. The company also contract-manufactures and fulfils for other peptide brands, which it presents as a category of its work without identifying clients. Because one organisation holds custody from raw material to shipped vial, there’s no handoff at which the lot record could be lost.
Every lot goes through a four-part panel: identity confirmation, purity at >99%, bacterial endotoxin, and sterility. Testing is done by two named outside laboratories, Freedom Diagnostics and Horizon Analytical. The certificate for each lot is published in the company’s batch certificates of analysis, and the lot number on the certificate is printed on every vial from that batch so a researcher can match document to product. Lyophilized material carries an expiration of about 24 months.
The catalog holds 34 compounds. Blends are listed with the composition disclosed per component: GLOW 70mg is GHK-Cu, BPC-157 and TB-500; KLOW 80mg adds KPV to those three; Wolverine 20mg is BPC-157 with TB-500. Processing time is within one business day, and shipments go out at room temperature.
What Amino Science Labs publicly states
Here is what the Amino Science Labs site states on the pages reviewed 2026-09-08. I’m quoting where I can.
On what the company does, the homepage and the disclaimers page each describe Amino Science Labs LLC as “a chemical supplier”, and the disclaimers page continues, “not a compounding pharmacy or chemical compounding facility”. The footer lists a Fort Lauderdale, Florida address. I found no language on the pages reviewed describing synthesis, manufacturing or a production facility, and the site menu has no about page. A description of who makes the peptides was not listed on the pages reviewed 2026-09-08.
On testing, the COA page states, “Every batch is independently tested by accredited U.S. laboratories.” The prose stops there, but every certificate download on that page is a PDF hosted at coas.freedomdiagnosticstesting.com, and the certificate itself lists Freedom Diagnostics as the issuer and “Amino Science” as the client. The homepage shows “HPLC Verified” and “U.S. Lab Tested” badges and the COA page’s meta text claims “99%+ purity”.
On the panel, the certificates I opened list HPLC-UV purity, LC-MS identity and net content, with the method given as “HPLC with UV detection coupled with mass spectrometry (LC-MS)”. A 5-Amino-1MQ certificate reports 99.67% purity and 9.99 mg net content for lot AS-10AM-0426. Endotoxin and sterility were not listed on those certificates or elsewhere 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. The disclaimers page itself recommends “independent third-party verification for critical research applications”.
On COA access, certificates are downloadable before purchase, carry a lot number and received and reported dates, and cover roughly 22 products against a 38-item catalog. The page says “Don’t see your product? Contact us for batch-specific COA requests.”
On blends, the Glow Blend product page names BPC-157, TB-500 and GHK-Cu but shows only the 70mg total. The linked certificate for lot AS-GLOW-0426 does list a figure for each component: GHK-Cu 60.86 mg, BPC-157 13.52 mg and Thymosin Beta-4 12.17 mg. Those three add to more than the 70mg on the label, which is the kind of thing I’d ask the vendor about before ordering, and I’d want their answer in writing. The Klow page calls the product “a proprietary multi-component research peptide preparation” and doesn’t name the components at all on the product page.
The genuine advantage Amino Science Labs has is breadth and speed of dispatch. The site states 38 catalog listings including nasal sprays, capsules and bacteriostatic water, “Same-Day Ship Before 5PM CT”, and free shipping over $250. For a lab that wants a spray format or a late-afternoon cutoff, those are real points in their favour.
Side by side: manufacturing, lab, panel and COA access
| Attribute | Blank Peptides | Amino Science Labs |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory | States it is “a chemical supplier”; synthesis language not listed — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States “accredited U.S. laboratories”; certificates are issued by Freedom Diagnostics — verify |
| HPLC purity | >99% per lot | States “99%+ purity”; certificates reviewed show 99.67% and 99.89% — verify |
| MS identity | Every lot | States LC-MS identity on certificates reviewed — verify |
| Endotoxin and sterility | Both, every lot | Not listed on pages or certificates reviewed 2026-09-08 — verify |
| Batch COA before purchase | Yes, lot-numbered at /coas/ | States lot-numbered downloads for about 22 of 38 products — verify |
| Blend mg split disclosed | Yes, per component | Product page shows total only; certificate lists per-component mg — verify |
| Catalog size | 34 compounds | States 38 listings including sprays and capsules — verify |
| Research-use labelling | Yes | States “not for human consumption in any form” — verify |
How to verify either supplier yourself
- Download one certificate from each vendor and put them next to each other. Look for a lot number, an issuing lab, the methods used, and any test beyond purity and identity. Whatever is missing from either one, ask for it by email and keep the reply.
- When the vial arrives, match the printed lot to the certificate you downloaded. If the vendor’s certificate page doesn’t cover your product, request the batch-specific document before you accept the shipment.
- For a blend, add the per-component figures on the certificate and compare the sum to the label. A mismatch is a question, and the vendor’s answer tells you a lot about how they handle their own records.
- Read the vendor’s self-description on the disclaimers or terms page, since that’s usually where the most careful wording lives.
- Work through the supplier verification checklist for both vendors and keep the dated results.
Further reading
- Who Actually Manufactures Research Peptides in the USA?
- Which Peptide Vendors Name Their Testing Lab?
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Disclose Blend Composition?
Frequently asked questions
How does Blank Peptides compare to Amino Science Labs?
On the pages reviewed 2026-09-08, Blank Peptides documents in-house synthesis, two named labs, a four-part panel including endotoxin and sterility, and a lot COA for every product. Amino Science Labs states it is a chemical supplier, links Freedom Diagnostics certificates showing purity and identity, and covers about 22 of 38 products. Catalog breadth and dispatch cutoff favour Amino Science Labs.
Does Amino Science Labs manufacture its own peptides?
The site describes the company as “a chemical supplier and not a compounding pharmacy or chemical compounding facility”. No synthesis or manufacturing language was listed on the pages reviewed 2026-09-08. That doesn’t establish who makes the product one way or the other, so if provenance matters to your work, ask them directly and get the answer in writing.
Which lab tests Amino Science Labs products?
The COA page says “accredited U.S. laboratories” without naming one, but every linked certificate is a Freedom Diagnostics PDF listing “Amino Science” as the client. So the lab is identifiable from the documents even though the site prose doesn’t state it. Blank Peptides names Freedom Diagnostics and Horizon Analytical directly.
Does either vendor test for endotoxin and sterility?
Blank Peptides runs bacterial endotoxin and sterility on every lot alongside identity and purity. On the Amino Science Labs certificates reviewed 2026-09-08, only HPLC-UV purity, LC-MS identity and net content were listed. That’s not a claim the testing isn’t done, only that it wasn’t published on the pages I read, so request it if your assay needs it.
Are these products for human use?
No. Both vendors label their products for research use only. Amino Science Labs states “all products are sold strictly for in-vitro research and laboratory use only”, and Blank Peptides labels every vial for in-vitro laboratory research by qualified professionals. A complete certificate of analysis documents what’s in the vial; it doesn’t change what the vial is for.
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.
