You want a second source. Maybe Amino Science Labs has been fine and you just don’t like depending on one vendor, or maybe a product you need isn’t in their catalog, or a lot number didn’t line up and you’d rather not find out the hard way whether that was a one-off. So you search for sites like Amino Science Labs and get a page of storefronts that all look the same: same badges, same “99% purity”, same stock photo of a vial on a white background.
Here’s the thing I wish someone had told me earlier: “sites like” is the wrong frame. What you want isn’t a site that resembles the one you’ve been using. You want a site that documents at least as much as the one you’ve been using, and ideally more, on the specific points that decide whether a vial is what it says it is. Similarity in look and price tells you nothing about that.
So this post is about switching on evidence. I’ll give you the five things to check on any candidate, show how Blank Peptides answers them, walk through what Amino Science Labs publicly states on the pages I reviewed on 2026-09-08 so you have a baseline to compare against, and hand you a checklist you can run on any third site before you place a first order.
Key takeaways
- The right way to compare peptide storefronts is by the documentation each one publishes before purchase, and not by how similar the catalog or pricing looks.
- Blank Peptides synthesizes, vials and finishes each lot in its own cGMP laboratory, tests every lot for identity, >99% purity, bacterial endotoxin and sterility at Freedom Diagnostics and Horizon Analytical, and posts a lot-numbered COA.
- Amino Science Labs publicly states it is “a chemical supplier”, that batches are tested by “accredited U.S. laboratories”, and links lot-numbered Freedom Diagnostics certificates showing HPLC-UV purity and LC-MS identity for about 22 products.
- A manufacturing description, endotoxin and sterility results, and per-component mg splits on blend product pages were not listed on the Amino Science Labs pages reviewed 2026-09-08.
- Every product mentioned is research-use-only material for in-vitro work, whichever site you buy it from.
What should you check before switching suppliers?
Let me set out the rubric before naming anyone, because if you take one thing from this post it should be the list, not the vendor.
One: provenance. Does the site synthesize the peptide or resell finished material? You find this in the vendor’s description of itself, usually on the homepage, about page, or the disclaimers page where the lawyers had a say. “We manufacture in our facility” and “we are a supplier” are two different statements, and you should read whichever one the vendor chose without adding to it.
Two: is the testing lab named? Any site can write “third-party tested”. A site that names the lab is giving you something you can check, because you can visit the lab, compare certificate formats, and see whether the claim holds up. If the site only says “accredited” or “independent”, ask which one and see how they respond.
Three: what’s on the certificate? HPLC purity is one measurement and LC-MS identity is a second, while bacterial endotoxin and sterility are two more, and they’re the ones that matter for anything going into a cell-based assay. A certificate showing purity alone has answered one of four questions.
Four: can you download a lot-numbered certificate before you buy, and will that lot number be printed on the vial? If the certificate only shows up after you’ve paid, or if it’s a generic sample with no lot, you’re deciding blind.
Five: for blends, are the components named and their mg disclosed, on the product page and on the certificate, and do those two agree with each other and with the label?
Everything else people compare on, such as company age, how slick the site is, or star ratings, I’d set aside. Those are things a storefront can buy. Documentation is the thing it has to earn, and the nice part is that checking it costs you nothing beyond twenty minutes and a notepad. Do the five checks on your current supplier first, so you know your baseline, and then do them on each candidate. You’ll usually find the field narrows fast, because most sites fall over at the second or third question and the ones that don’t are worth a trial order.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the USA and keeps the whole production chain in-house. Peptides are synthesized, then vialed, lyophilized, finished and labelled at the same facility, with quality control run there before any lot ships. The company also contract-manufactures and fulfils for other peptide brands, which it describes as a category of its business without naming clients. One organisation holds custody of each lot from raw material to shipped vial.
Each lot goes through a four-part panel: identity, purity at >99%, bacterial endotoxin, and sterility. Testing is done by two named outside laboratories, Freedom Diagnostics and Horizon Analytical, and every lot’s certificate is published in the company’s batch certificates of analysis. The lot number on the certificate is printed on every vial from that batch, so a researcher can match the document to the product in hand. Lyophilized product carries an expiration of roughly 24 months.
The catalog runs to 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; Wolverine 20mg is BPC-157 with TB-500. Processing time is within one business day, and orders ship at room temperature.
What Amino Science Labs publicly states
Since you’re switching from or comparing against Amino Science Labs, here’s the baseline from the pages reviewed 2026-09-08.
On provenance, the homepage and the disclaimers page both describe the company 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 about page in the site menu and no language on the pages reviewed describing synthesis, manufacturing or a production facility. A statement of who makes the product was not listed on the pages reviewed 2026-09-08.
On the lab, the COA page states: “Every batch is independently tested by accredited U.S. laboratories. Download the full COA for any product below.” The prose doesn’t name the lab, but every download links to a PDF hosted at coas.freedomdiagnosticstesting.com, and the certificate I opened lists Freedom Diagnostics as the issuer and “Amino Science” as the client. So the lab is identifiable through the documents, which is a good sign, even though the site copy only says “accredited”.
On the panel, the certificates reviewed 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 for lot AS-10AM-0426 reports 99.67% purity and 9.99 mg net content. Endotoxin and sterility were not listed on those certificates or on any page 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.
On COA access, the certificates are downloadable before purchase and lot-numbered. The COA page covers about 22 products against 38 catalog items and says “Don’t see your product? Contact us for batch-specific COA requests.”
On blends, the Glow Blend page names BPC-157, TB-500 and GHK-Cu and shows only the 70mg total; the certificate for lot AS-GLOW-0426 lists a mg figure for each component. The Klow page calls the product “a proprietary multi-component research peptide preparation” and doesn’t name components on the page, pointing you instead to the lot certificate.
If you’re leaving Amino Science Labs, know what you’re giving up. The site states 38 listings including nasal sprays, capsules and bacteriostatic water, “Same-Day Ship Before 5PM CT”, free shipping over $250, and rewards and membership programmes. A replacement that only sells lyophilized vials with a next-day cutoff won’t match that breadth, and you should decide whether it matters for your work.
Side by side: what to compare before switching
| Attribute | Blank Peptides | Amino Science Labs |
|---|---|---|
| Synthesises in-house | Yes, own cGMP laboratory | States it is “a chemical supplier”; manufacturing language not listed — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States “accredited U.S. laboratories”; linked certificates are from Freedom Diagnostics — verify |
| HPLC purity | >99% per lot | States “99%+ purity”; certificate reviewed shows 99.67% — 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
- Before a first order from any new site, open a certificate and check for a lab name, a lot number, dates, methods, and anything beyond purity and identity. Email for what’s missing and keep the reply.
- Order one vial first and match its printed lot to the certificate you downloaded. If the vendor’s COA page doesn’t cover that product, request the batch document before you accept the shipment.
- Read the disclaimers or terms page for the vendor’s own account of what it does, because that’s where the precise wording lives.
- For blends, add the per-component numbers on the certificate and compare to the label before you plan around the product.
- Run the supplier verification checklist on every candidate and keep dated notes so you’re comparing like with like.
Further reading
- Best Research Peptide Suppliers: Ranked by What They Document
- Who Actually Manufactures Research Peptides in the USA?
- Which Peptide Vendors Name Their Testing Lab?
- Peptide Vendors With Public Per-Batch COA Libraries
Frequently asked questions
What are the best sites like Amino Science Labs?
The better question is which sites document more. Blank Peptides publishes 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 purity and identity certificates for about 22 products. Any third site you consider should be held to the same five checks before a first order.
What should I check before switching peptide suppliers?
Five things: whether the site synthesizes or supplies, whether the lab is named, whether the certificate covers identity, purity, endotoxin and sterility, whether you can download a lot-numbered COA before buying, and whether blend components are disclosed in mg. Write down what you find, with the date, so you can compare candidates fairly.
Does Amino Science Labs name its lab?
The site prose says “accredited U.S. laboratories” without naming one, but every certificate download on the COA page is a Freedom Diagnostics PDF that lists “Amino Science” as the client. So the lab is identifiable from the documents reviewed 2026-09-08. Blank Peptides names Freedom Diagnostics and Horizon Analytical directly on its site.
What does Amino Science Labs not publish?
On the pages reviewed 2026-09-08, a description of who manufactures the product, endotoxin and sterility results, and per-component mg on blend product pages were not listed. That isn’t a claim the information doesn’t exist, only that it wasn’t published where I looked. Ask the vendor directly for anything your protocol depends on.
Are these products for human use?
No. Amino Science Labs states its products are “sold strictly for in-vitro research and laboratory use only” and “not for human consumption in any form”. Blank Peptides labels every vial for in-vitro laboratory research by qualified professionals. Switching suppliers, or comparing them, doesn’t change what the material 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.
