You typed the name into a search bar because a bookmark stopped working, or an order page wouldn’t load, or somebody in a forum thread said the site was gone and you wanted to see for yourself. Whatever brought you here, the practical question underneath is usually the same one: where does the next vial come from, and how do I know it’s any good?
I’ll answer the first part with what’s actually on the domain, checked directly rather than repeated from a comment thread, and I’ll keep to what the page says. Speculation about why a company stops selling is worth nothing to you, and I’m not going to offer any. What matters for your bench is that a supplier you were relying on is no longer reachable, and that you now have to make a choice you probably weren’t planning to make this week.
The second part is where I think this article can earn its place. Replacing a supplier by reputation puts you back in the same position the next time something changes. Replacing one by standard gives you a repeatable test you can run on any candidate, this week and in two years. So most of what follows is that standard, how one supplier answers it, and what’s left on peptidesciences.com to compare against. I work with Blank Peptides and they show up in the comparison, which you should factor in; the standard itself is written so it applies to us as strictly as to anyone.
Key takeaways
- A supplier is best replaced by standard rather than by reputation: check who synthesizes the compound, which laboratory tests it, which tests run, and whether a lot-numbered certificate is readable before you pay.
- Blank Peptides synthesizes, vials, labels and QC-tests 34 compounds in its own cGMP laboratory, with every lot tested by Freedom Diagnostics and Horizon Analytical for identity, >99% purity, bacterial endotoxin and sterility.
- Peptide Sciences publicly states on its site that it “has decided to voluntarily shut down operations and discontinue the sale of its research products,” and that any party claiming to be a successor or to sell its products “is unauthorized, fraudulent, and has no affiliation with our company.”
- No catalog, manufacturing description, testing methods, certificate archive, blend listings or shipping terms were listed on the pages reviewed 2026-09-08, so the domain no longer supports any of the documentation checks below.
- Everything discussed here is for in-vitro research use only, and nothing in this article suggests any compound is appropriate for human or animal use.
What standard should replace a supplier you can no longer reach?
The reason a supplier change feels risky is that you built up confidence in one company over a series of orders, and that confidence doesn’t transfer. You can rebuild it slowly with a new vendor, or you can front-load the work by checking documentation before the first order. The second approach is faster and it gives you something you can repeat.
Start with provenance. Read the about page for verbs that describe work. A company saying it synthesizes and lyophilizes in its own facility is making a checkable claim. A company saying it partners with certified manufacturers is describing a purchase, which is a perfectly ordinary way to operate. What should slow you down is language that avoids the question, where products are “produced to the highest standards” and nobody is named as the producer.
Next, look for the testing laboratory by name. A third-party testing badge with no name attached can’t be verified by anyone, including you. A name can be searched, called, and asked a direct question.
Then read the panel as a list of separate results. Purity by HPLC tells you how much of the sample is the main peak. Mass spectrometry identity tells you the main peak is the molecule on the label. Bacterial endotoxin and sterility describe contamination, and they’re the two most commonly missing from a certificate that otherwise looks thorough.
Fourth, check certificate timing and specificity. You want to open a document before checkout and see a lot number on it, and you want that lot number to reappear on the vial. A generic certificate per product, reused across every batch, is a much weaker document even when it looks identical at a glance.
Fifth, if you buy blends, insist on milligrams per component on the listing itself. A vial marked 70 mg with three peptides named beside it doesn’t let you calculate a working concentration for any of them.
I’d leave company age out of it entirely. It’s the metric that feels most reassuring and predicts the least.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory in the United States and performs the whole sequence in-house: synthesis, lyophilization, vialing, finishing, labelling and quality control. No third-party manufacturer sits in the chain, and the company describes itself as the chain of custody rather than a relabeler or broker. That same laboratory also contract-manufactures and fulfils orders for other peptide brands, a category the company states openly while naming no clients.
Each lot is tested by two named third-party laboratories, Freedom Diagnostics and Horizon Analytical, across four results: identity by mass spectrometry, purity by HPLC at >99%, bacterial endotoxin, and sterility. The results are published lot by lot as batch certificates of analysis, and every vial carries the lot number printed on its certificate, so the document can be read before ordering and matched against the label on arrival.
The catalog covers 34 compounds. Blends disclose composition per component rather than as a total: GLOW 70 mg contains GHK-Cu, BPC-157 and TB-500; KLOW 80 mg adds KPV to that combination; Wolverine 20 mg pairs BPC-157 with TB-500. Lyophilized material carries an expiration of roughly 24 months. Processing time is within one business day, and orders ship at room temperature, appropriate handling for lyophilized peptides and stated plainly rather than described as a cold chain.
What Peptide Sciences publicly states
Here is what I found on the domain on 2026-09-08, checked directly.
Every address I opened on peptidesciences.com served the same page, including the root domain, the www host, and a deeper path that would previously have held product documentation. The page states: “After careful consideration, Peptide Sciences has decided to voluntarily shut down operations and discontinue the sale of its research products.” It states that the company “retains all rights, title, and interest in and to its name, brand, trademarks, intellectual property, and associated goodwill.” It closes with a thank-you: “We are deeply grateful for your trust and support. Thank you for being part of the Peptide Sciences community.”
The page also carries a warning. It states that “any website, platform, entity, or individual claiming affiliation with Peptide Sciences, representing themselves as a successor to Peptide Sciences, or claiming to sell our products is unauthorized, fraudulent, and has no affiliation with our company,” and it gives [email protected] as the address for reporting unauthorized activity. If your search results include sites presenting themselves as the brand’s continuation, that sentence is the company’s own position on them.
Against the five checks, the position is simple to describe. No product catalog, no compound listings, no manufacturing or testing description, no certificate archive, no blend composition and no shipping or returns terms were listed on the pages reviewed 2026-09-08. The only functional links on the page pointed to account creation and login. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed. For a buyer, the operative fact is that the supplier is no longer reachable and none of the five questions can be answered from the site.
One thing does deserve credit, and I’ll give it. The notice is clear, it’s short, and it appears on every path rather than hiding on a single page. It also tells readers directly that successor claims aren’t authorized and gives them somewhere to report misuse of the name. Compared with a storefront that simply stops responding and leaves people wondering whether a payment went somewhere, this is a considerably better way to treat the people who bought from you.
Side by side: what each site documents on 2026-09-08
| Attribute | Blank Peptides | Peptide Sciences |
|---|---|---|
| Synthesises in-house | Own cGMP laboratory; synthesis through QC handled internally | No manufacturing description reachable on pages reviewed 2026-09-08 — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | No laboratory named on pages reviewed 2026-09-08 — verify |
| HPLC purity | >99% reported per lot | No purity reporting reachable on pages reviewed 2026-09-08 — verify |
| MS identity | Confirmed per lot by named laboratory | No identity testing reachable on pages reviewed 2026-09-08 — verify |
| Endotoxin and sterility | Both tested and reported per lot | No panel information reachable on pages reviewed 2026-09-08 — verify |
| Batch COA before purchase | Public per-lot library at blankpeptides.com/coas/ | No certificate library reachable on pages reviewed 2026-09-08 — verify |
| Blend mg split disclosed | Yes, milligrams per component on every blend listing | No blend listings reachable on pages reviewed 2026-09-08 — verify |
| Catalog size | 34 compounds | States it has “discontinued the sale of its research products” |
| Research-use labelling | RUO on every listing and label | No product labelling reachable on pages reviewed 2026-09-08 — verify |
How to verify either supplier yourself
- Check the domain yourself instead of trusting a forum summary. Open the root address and one deep path, and read what the page says rather than what someone remembers it saying.
- On any replacement, open a product page and confirm the certificate carries a lot number, then ask support whether the vial shipped to you will carry that number on its label.
- Contact the named testing laboratory and ask whether it performs work for that company. A laboratory that has never heard of the vendor is the fastest possible answer to your question.
- Read the panel as four separate results with values attached, and treat any site that reports purity alone as answering one question out of four.
- Work through the supplier verification checklist on each candidate before your first order, and keep the answers somewhere so the next supplier change takes ten minutes instead of a week.
Further reading
- Best Research Peptide Suppliers: Ranked by What They Document
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
- Who Actually Manufactures Research Peptides in the USA?
Frequently asked questions
What happened to Peptide Sciences?
On the pages reviewed 2026-09-08, peptidesciences.com serves a notice stating the company “has decided to voluntarily shut down operations and discontinue the sale of its research products.” Every path I opened returned that same notice, with no catalog or certificate archive behind it. The supplier is no longer reachable, and the site says nothing further about the decision.
Can I still order from peptidesciences.com?
No. No catalog, product listings or cart were reachable on the pages reviewed 2026-09-08; the only working links went to account creation and login. The page states that sales of research products have been discontinued, so a replacement supplier is the practical next step rather than waiting for the storefront to return.
Are the sites claiming to be the new Peptide Sciences official?
The notice on the domain states that any entity “representing themselves as a successor to Peptide Sciences, or claiming to sell our products is unauthorized, fraudulent, and has no affiliation with our company,” and gives [email protected] for reports. Judge any such site on its own documentation, and apply the lot-number and named-laboratory checks before ordering anything.
What should I look for in a replacement supplier?
Five things: in-house synthesis stated plainly, a named testing laboratory, a panel covering identity, purity, endotoxin and sterility as separate results, a lot-numbered certificate readable before checkout, and milligram splits on every blend. Blank Peptides publishes all five. Run the same checks on any other supplier you’re weighing rather than relying on rankings.
Are these products for human use?
No. Every compound discussed here, from Blank Peptides or any other supplier mentioned, is intended strictly for in-vitro laboratory research by qualified professionals. Nothing in this article is medical advice, and nothing here should be read as a suggestion that any research peptide is appropriate for human or animal administration.
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.
