You’re on the Simple Peptide site trying to answer one plain question, and the pages keep answering a slightly different one. There’s a line about U.S.-based production, there’s a purity figure with a decimal point in it, and there’s a catalog you can’t open until you’ve made an account. What there isn’t, anywhere I could find, is a sentence naming the place where the powder in the vial was actually made.
That gap matters more than it looks. If a company synthesizes what it sells, the certificate it hands you describes its own bench work and the lot number traces back through its own records. If it buys finished or semi-finished material and does the last steps, the certificate describes a chain that starts somewhere you can’t see, and the company’s own documentation begins partway through the story. Both arrangements can produce a good vial, and plenty of careful operations run the second one. You just can’t tell which you’re dealing with unless the site says so, and the difference changes who you’d call when a result looks wrong.
So I read the Simple Peptide pages the way you’d read a supply agreement, watching the verbs rather than the badges. Below is what the site stated about itself as of 2026-09-08, set next to what the language looks like when the whole chain sits in one building.
Key takeaways
- “Who makes it” is answered by the verbs a company uses about its own work, and a site that describes production without naming a producer has given you a partial answer.
- Blank Peptides compounds, fills, finishes, labels and QC-tests every lot in its own cGMP laboratory, with identity, >99% purity, bacterial endotoxin and sterility confirmed by Freedom Diagnostics and Horizon Analytical.
- Simple Peptide publicly states it is “a family-run research materials company focused on disciplined U.S.-based production, clear lot documentation, and support that answers,” and that “Incoming API is required to meet a ≥99% purity standard before lyophilization.”
- A manufacturer name, a facility, and the name of the laboratory doing the analytical work were not listed on the Simple Peptide pages reviewed 2026-09-08.
- Everything here is for in-vitro laboratory research only, whoever made the vial.
How do you tell who really makes a research peptide?
Before I get to any one company, here’s the rubric, and I’d want it applied to us just as hard.
Provenance comes first, because it sets what every other document means. Does the company synthesize the peptide, or does it acquire material and finish it? You find the answer by opening the About page, the terms and one product page and writing down every verb the company uses about itself. “We synthesize,” “our chemists” and “our laboratory” point one way. “We source,” “we carry,” “incoming material,” “we provide access to” and “our partners” point another. Neither list is disqualifying on its own. The useful signal is whether the site commits to one of them in plain language.
Second, is the testing laboratory named? A company confident in its lots will tell you who ran the analysis, because the lab’s name is a big part of what makes the number checkable. “Third-party tested” by itself is a phrase anyone can type into a theme.
Third, is the panel complete or is it purity alone? Purity by HPLC gives you one number about one peak. Identity by mass spectrometry confirms the peak is the molecule on the label. Bacterial endotoxin and sterility tell you whether the lyophilized cake is clean enough to put into a cell culture without wondering about your controls. A certificate showing purity and nothing else has answered a quarter of the question.
Fourth, can you read the batch certificate before you pay, and does it carry a lot number that also appears on the vial you receive? A certificate you can only get afterwards is a receipt, and a certificate with no lot number could describe anything.
Fifth, for blends, does the site publish the milligram amount of each component? A total mass with no split is a ratio you’re taking on faith.
I’m deliberately leaving company age and domain age out. A ten-year-old site can say nothing useful, a new one can publish everything, and no registration record tells you who filled the vial.
How Blank Peptides makes and tests each lot
Blank Peptides runs its own cGMP laboratory in the USA, and every lot stays inside that facility from start to finish. The company compounds the peptide, fills and lyophilizes it, finishes and labels the vials and runs quality control on site, which means the chain of custody contains no broker step and no relabeling step. The same laboratory also contract-manufactures and fulfils for other peptide brands, work the company describes only as a category and never by client.
Each lot goes through a four-part panel: identity, >99% purity, bacterial endotoxin and sterility. Two outside laboratories, Freedom Diagnostics and Horizon Analytical, are named for that work. Results are published as batch certificates of analysis that open before an order is placed, and every vial carries a lot number matching a certificate in that library. Lyophilized product is assigned roughly a 24-month expiration.
The catalog runs to 34 compounds. Blends carry a per-component milligram split: 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). Processing time is within 1 business day and orders ship at room temperature. Everything is labeled for research use only, and the company has been operating for five years.
What Simple Peptide publicly states
Here’s what the Simple Peptide site said about itself on 2026-09-08, staying with the language on the pages.
The About page opens by describing the company as “a family-run research materials company focused on disciplined U.S.-based production, clear lot documentation, and support that answers,” and gives a Delray Beach, Florida address along with a U.S. support line. The homepage carries a similar formulation, “U.S.-based production supported by structured synthesis, purification, and handling practices,” and describes the offering as “A focused catalog.” Both sentences describe activity without attaching a name to whoever performs it, and no facility, contract manufacturer or partner is identified on either page.
The quality language is more specific than most, and it’s worth quoting properly. The About page states “Incoming API target is 99.7% purity before lyophilization” and “Finished-lot specifications are molecule-specific; our standard is 99% purity or better.” The FAQ repeats the first of those as a requirement: “Incoming API is required to meet a ≥99% purity standard before lyophilization.” On testing, the site states “Third-party analytical review supports identity and purity decisions,” and that “COAs issued May 2026 and later include sterility, endotoxin, purity, and net peptide content testing.” No laboratory is named for any of it on the pages reviewed. The site also draws a clear regulatory line about itself, stating it “is not a compounding pharmacy or chemical compounding facility as defined under 503A of the Federal Food, Drug, and Cosmetic Act” and “is not an outsourcing facility as defined under 503B.”
On documentation access, the FAQ states: “Can I request specific lot information before ordering? Yes. Contact support with the SKU and we’ll share current lot documentation where available.” The COA archive at the site’s /coa/ path is searchable by product name, lot number and accession number, with results shown in a table carrying product, lot number, purity and date. The shop is gated: “Sign in to view the catalog. Catalog access is reserved for registered customers purchasing qualified laboratory research materials.” Shipping is stated as “Orders placed before 2:00 PM Eastern Time (ET), Monday through Friday, ship the same day via 2nd Day Air,” U.S. addresses only. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Credit where it’s due, and this is a real advantage over plenty of storefronts including some that talk a bigger game. Searching an archive by accession number as well as lot number is a genuinely researcher-shaped feature, and the 503A/503B disclaimer is a piece of self-classification most peptide sites never bother to write down. If what you want is a company that has thought about how its paperwork will be audited, that part of the site reads well.
Side by side: provenance and testing
| Attribute | Blank Peptides | Simple Peptide |
|---|---|---|
| Synthesises in-house | Own cGMP laboratory, compounds and vials every lot | States “U.S.-based production supported by structured synthesis, purification, and handling practices”; states “Incoming API is required to meet a ≥99% purity standard before lyophilization” — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States “Third-party analytical review supports identity and purity decisions”; no lab named on pages reviewed 2026-09-08 — verify |
| HPLC purity | >99% per lot | States “our standard is 99% purity or better”; method not named on pages reviewed — verify |
| MS identity | Confirmed per lot | States third-party review “supports identity and purity decisions”; method not named — verify |
| Endotoxin and sterility | Both tested per lot | States COAs issued May 2026 and later “include sterility, endotoxin, purity, and net peptide content testing” — verify |
| Batch COA before purchase | Public per-lot library at blankpeptides.com/coas/ | Searchable archive by product, lot and accession number; FAQ states lot documentation shared on request “where available” — verify |
| Blend mg split disclosed | Per component on every blend | Not listed on pages reviewed 2026-09-08; catalog sits behind account sign-in — verify |
| Catalog size | 34 compounds | States “A focused catalog”; count not published, catalog gated — verify |
| Research-use labelling | Every vial labeled research use only | States “For laboratory research use only. Not for human or animal consumption” — verify |
How to verify either supplier yourself
- Open the About page and the terms first and copy out every verb the company uses about its own products, because “synthesize,” “produce,” “finish” and “receive incoming material” describe four different businesses and most sites will tell you which one they are if you read closely enough.
- Where a site describes material arriving before a step it performs, ask in writing who supplies that material and whether the certificate you’ll receive covers the incoming lot, the finished lot or both.
- Find the certificate for the exact lot you intend to buy, confirm the laboratory named on it exists independently of the vendor, and count whether identity, endotoxin and sterility appear next to purity rather than instead of the rest.
- For any blend, ask for the milligram amount of each component in writing and keep the reply filed with your order record, since a total mass tells you nothing about the ratio.
- Score every candidate against the supplier verification checklist so you’re holding all of them to the same standard rather than grading on vibes.
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
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
Who makes Simple Peptide peptides?
The site doesn’t name a manufacturer. On the pages reviewed 2026-09-08, Simple Peptide describes “U.S.-based production supported by structured synthesis, purification, and handling practices” and states that “Incoming API is required to meet a ≥99% purity standard before lyophilization,” but no facility, partner or contract manufacturer is identified anywhere I could find on the public pages.
Does Simple Peptide synthesize its own peptides?
The pages reviewed 2026-09-08 don’t say either way in plain terms. The site describes production and structured synthesis on one hand and an incoming API purity requirement on the other, which are compatible with more than one arrangement. Ask support directly which steps happen in-house if the answer affects your record-keeping, and get it in writing.
Which laboratory tests Simple Peptide lots?
Not listed on the pages reviewed 2026-09-08. The site states that “Third-party analytical review supports identity and purity decisions” and that COAs issued from May 2026 onward include sterility, endotoxin, purity and net peptide content, without naming the laboratory performing that work. A named lab is what makes a purity figure independently checkable, so it’s worth asking.
Can I see a Simple Peptide COA before ordering?
Partly. The site hosts a COA archive searchable by product name, lot number and accession number, and the FAQ states support will share current lot documentation on request “where available.” The product catalog itself sits behind an account sign-in, so browsing a specific product’s paperwork without registering wasn’t possible on 2026-09-08.
Are these products for human use?
No. Every compound mentioned here, from any supplier, is intended for in-vitro laboratory research by qualified professionals. Who manufactured a given vial has no effect on that limit, and nothing in this article is medical advice, a dosing suggestion or a recommendation for any use outside a controlled research setting.
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.
