Peptide Sciences Closed.
Cenexa Labs Is Picking Up the Torch.
Peptide Sciences built this industry. They ran a serious operation, held a high standard, and earned the trust of researchers across the country for over a decade. That kind of reputation means something. So does losing them as your supplier.
A new home for the research community they built.
If you are scrambling right now, you are not alone. A lot of serious researchers are in the same position, and not all of the options flooding your search results deserve your trust.
That is why this page exists.
We are Cenexa Labs — a USA-based peptide manufacturer, not a reseller — and we would like to introduce ourselves. We synthesize in-house, purify every batch to 99%+ via HPLC, test for heavy metals and endotoxins, and ship domestically in 2-3 days with a COA tied to your specific lot. We also have the largest selection of peptide and bioregulator products in the USA.
We are picking up the torch. Here is everything you need to hold us to that.
AI Summary (TLDR)
Peptide Sciences voluntarily closed in March 2026. No FDA enforcement action has been confirmed. The viral claims about raids and forced shutdowns are unverified speculation that we know to be false. Cenexa Labs is a USA-based research peptide manufacturer that synthesizes all products in-house using SPPS in an ISO-certified cleanroom, purifies to 99%+ purity via HPLC, and tests every batch for heavy metals, endotoxins, and sequence accuracy before release. Orders ship in 2-3 business days with a batch-linked COA. Trusted by over 18,000 researchers.
AI Summary (TLDR)
Peptide Sciences voluntarily closed in March 2026. No FDA enforcement action has been confirmed. The viral claims about raids and forced shutdowns are unverified speculation that we know to be false. Cenexa Labs is a USA-based research peptide manufacturer that synthesizes all products in-house using SPPS in an ISO-certified cleanroom, purifies to 99%+ purity via HPLC, and tests every batch for heavy metals, endotoxins, and sequence accuracy before release. Orders ship in 2-3 business days with a batch-linked COA. Trusted by over 18,000 researchers.
A Lot Is Being Said Right Now. Most of It Is Wrong.
Since the closure announcement, the internet has filled up fast with takes about what happened to Peptide Sciences. FDA raids. Criminal investigations. Forced shutdowns. Regulatory hammers. It makes for compelling reading. It is also, for the most part, speculation dressed up as fact.
Within days of the announcement, videos and posts appeared across social media claiming Peptide Sciences was raided by the FDA, sued by pharmaceutical companies, criminally investigated, or forced to close by regulators.
These claims spread fast because they make for compelling content.
They are not accurate. None of it has been confirmed by any official source, any court record, or any statement from Peptide Sciences themselves. Here is what people outside this industry do not understand: at the USA manufacturing level, this is a small world. The people who operate in it know each other, know how decisions get made, and know the difference between a forced exit and a deliberate one. We know what happened here.
This was a voluntary business decision. The people making YouTube videos and writing fear-based blog posts to capture search traffic do not have that context or any “inside” knowledge. We do. And we are not going to use it to spread rumors or manufacture urgency. We are going to tell you the truth:
Peptide Sciences closed on their own terms.
Peptide Sciences posted a voluntary closure notice. That is all that is confirmed. They were a well-run operation with real quality standards and a genuine track record in this industry. The decision to close was theirs to make, and we respect it. We wish them well in whatever comes next.
We are saying this because the research community deserves straight information, not speculation monetized as content. If you are choosing a new supplier, you deserve to make that decision without misinformation clouding the picture.
Peptide Sciences Set the Standard. Cenexa Is Built on Top of It.
Peptide Sciences was USA-made. Verified purity, real documentation, a supplier researchers could hold to a standard. That is the bar they set for this industry. Cenexa Labs was built to clear that bar and go further. Not because they fell short, but because that is what building on a strong foundation looks like.
If you came from Peptide Sciences, you already know what good looks like. Here is how Cenexa delivers it:
USA Synthesis, Start to Finish
Cenexa Labs synthesizes all peptides in the United States using in-house Solid Phase Peptide Synthesis (SPPS) in an ISO-certified cleanroom. We do not import pre-synthesized crude peptides from overseas. Synthesis, purification, QC, sterile filtration, lyophilization, cold storage, and shipping all happen here.
The Same Documentation Standard, With More Depth
Every Cenexa order includes a batch-linked Certificate of Analysis with HPLC purity data, mass spectrometry identity confirmation, heavy metal screening results, and endotoxin test results. All tied to your specific lot number, not a generic template. The COA you get is the test that was run on your batch.
The Cenexa Pure 12-Step Process (how we make our peptides)
Every step of our manufacturing process is published in full so researchers can evaluate it before placing an order. Here is what the Cenexa Pure 12-step process covers:
- Pharma-grade raw materials: every batch starts with certified amino acids and reagents tested for purity before synthesis begins.
- ISO-certified cleanroom manufacturing: sterile equipment, positive-pressure filtered air, controlled access.
- Solid Phase Peptide Synthesis (SPPS): amino acids coupled in precise sequence on a resin scaffold, the same method used in pharmaceutical drug manufacturing.
- Cleavage and deprotection: the completed peptide chain is released from the resin and all protective groups removed.
- Crude purification: solvents, resin fragments, and large byproducts removed before precision purification begins.
- HPLC purification: preparative HPLC separates the target peptide from fragments and impurities. Every batch purified to 99%+ verified purity.
- Heavy metal and endotoxin screening: every batch tested for lead, mercury, arsenic, cadmium, and bacterial endotoxins. Product held until it passes.
- Analytical quality control: high-resolution mass spectrometry and analytical HPLC confirm peptide identity, sequence, and purity. This data appears on your COA.
- Sterile filtration and aseptic fill: 0.22 micron membrane filter removes all bacteria and particulates. Vials filled immediately under aseptic conditions.
- In-vial lyophilization and nitrogen sealing: freeze-dried under high vacuum in the final vial, then stoppered under nitrogen and sealed with aluminum crimps.
- Medical-grade freezer storage: finished vials stored at minus 80 degrees Celsius until the moment of shipment.
- Expedited USA shipping: 2-3 business day domestic delivery. No customs delays. No international cold-chain exposure.
See why other peptide researchers are choosing Cenexa Labs as a Peptide Sciences alternative.
Not Every Alternative Is What It Claims to Be.
When a major supplier closes, the market moves fast. There are companies right now running aggressive campaigns to capture Peptide Sciences customers who have not had time to do their research. Some of those companies are legitimate. Many are not.
Here is a direct comparison between what Cenexa delivers on every order and what you will find from companies that are more focused on your credit card number than your research results.
Cenexa Labs vs. Typical Peptide Sciences Alternatives
| Manufacturing Standard | Cenexa Pure™ (USA) | Typical Overseas Supplier |
|---|---|---|
| Country of Manufacture | ✅ USA-based synthesis | ❌ China, India, or unknown |
| Cleanroom Environment | ✅ ISO-certified cleanroom | ❌ Unverified or undisclosed |
| Synthesis Method | ✅ In-house SPPS synthesis | ❌ Imported pre-synthesized crude |
| Heavy Metal Testing | ✅ Every batch screened | ❌ Rarely or never performed |
| Endotoxin Testing | ✅ Every batch screened | ❌ Rarely or never performed |
| HPLC Purification | ✅ ≥99% purity verified | ❌ Often ≥95% or unverified |
| Mass Spectrometry (MS) | ✅ Sequence confirmed per batch | ❌ Often absent or outsourced |
| Sterile Filtration (0.22 μm) | ✅ Standard on every vial | ❌ Not disclosed or skipped |
| In-Vial Lyophilization | ✅ Performed in-house | ❌ Often done in unregulated facilities |
| Nitrogen Seal | ✅ Yes, every vial | ❌ Often air sealed |
| Storage Temperature | ✅ −80°C medical freezers | ❌ −20°C or ambient |
| Batch-Linked COA | ✅ Published and verifiable | ❌ Generic, undated, or absent |
| Shipping Time | ✅ 2–3 business days domestic | ❌ 1–4 weeks with customs risk |
Researchers coming from Peptide Sciences already know what a serious supplier looks like. Use that as your filter. If a supplier cannot tell you where and how the peptide was synthesized, show you a batch-linked COA with mass spectrometry data, and confirm they test for heavy metals and endotoxins before release, you have your answer about how seriously they take quality.
18,000+ Peptide Researchers Trust Cenexa Labs
Cenexa Labs has shipped to over 18,000 researchers across the United States with a 4.5 out of 5 star rating. Our average customer has ordered four or more times. That does not happen by accident. It happens because what arrives matches what was promised, every time. For researchers who built their trust around Peptide Sciences stability and dependability, you will get even better from Cenexa Labs. Our reorder rate shows you we deliver it.
What Customers Are Saying...
Your Peptide Research Does Not Have To Stop.
Peptide Sciences closing was the end of an era, but not the end of peptides. Let Cenexa Labs take over and support your next phase of peptide research. Come see for yourself.
Browse our full catalogue of USA-made research peptides, bioregulators, and peptide blends.
Every product ships same day with average 2-3 day delivery. Flat rate $9.95 shipping and orders over $300 ship free.
Special Discount For Peptide Science Customers
20% OFF CODE:
PEPTIDESCIENCES20
We understand its hard to trust someone new, and while our prices are already significantly lower than Peptide Sciences were, we want to make giving us a shot a no brainer, so here is 20% OFF your first order with us!
Some Of Our Popular Peptide Categories...
Frequently Asked Questions
Q: What happened to Peptide Sciences?
A: Peptide Sciences voluntarily closed operations and discontinued the sale of their research products. They posted a brief notice on their website thanking their community. No detailed public explanation was provided. They were one of the most respected names in the research peptide industry for over a decade. Since the announcement, videos and posts across social media have claimed they were raided by the FDA, sued by pharmaceutical companies, or forced to close. None of those claims are confirmed by any official source, court record, or statement from Peptide Sciences. As a USA-based manufacturer operating in this space, we run in the same circles and know why they made the decision they did, but it is not for us to share. What we will say is that the popular fearmongering and sensational narratives going around social media are NOT true. What is confirmed is a voluntary closure by a team that built something real and chose to walk away on their own terms.
Q: Is Peptide Sciences permanently closed?
A: Yes. As of March 2026, Peptide Sciences has discontinued the sale of all research products and is no longer accepting orders. Customers with outstanding orders or store credit should contact Peptide Sciences directly, though no formal transition or refund process has been announced.
Q: Where can I buy research peptides now that Peptide Sciences has closed?
A: Cenexa Labs is a USA-based research peptide manufacturer with in-house SPPS synthesis, HPLC-verified purity of 99% or greater, batch-linked COAs with mass spectrometry data, heavy metal and endotoxin screening on every batch, and 2-3 business day domestic shipping. For researchers who trusted Peptide Sciences, Cenexa operates at an even higher documented quality standard.
Q: How does Cenexa Labs compare to Peptide Sciences?
A: Both are USA-based operations built on verified purity, real documentation, and a commitment to the research community. Cenexa performs all synthesis in-house in an ISO-certified cleanroom using SPPS, purifies to 99%+ via HPLC, confirms identity by mass spectrometry, screens every batch for heavy metals and endotoxins, lyophilizes in-vial under nitrogen, and stores at minus 80 degrees Celsius until shipment. We have published our full 12-step manufacturing process HERE, so researchers can evaluate exactly what they are getting before they order.
Q: Is Cenexa Labs more expensive than Peptide Sciences?
A: No. Peptide Sciences was widely recognized as one of the most expensive research peptide suppliers in the market. Cenexa Labs offers USA-synthesized, sterile research peptides at price points that are lower than Peptide Sciences has ever offered. You are getting domestic synthesis, in-house HPLC purification to 99%+, heavy metal and endotoxin testing, and a batch-linked COA at a price that is more competitive than what you were already paying. Orders over $300 ship free. Flat rate $9.95 shipping on all other orders. Also Peptide Sciences customers can get 20% off their first order with Cenexa Labs by using coupon code: PEPTIDESCIENCES20
Q: Are Cenexa Labs peptides made in the USA?
A: Yes. Every peptide sold by Cenexa Labs is synthesized in the United States. We do not import pre-synthesized crude peptides or use overseas contract manufacturers. Synthesis, purification, quality control, lyophilization, and cold storage all take place in our USA facility. Peptide Sciences did fill/finish on their peptides in the USA.
Q: What should I look for in a Peptide Sciences replacement?
A: Ask every potential supplier these questions directly: Where is the peptide synthesized? Can you show a batch-linked COA with mass spectrometry data, not just HPLC purity? Do you test for heavy metals and endotoxins before release? Is the product lyophilized, nitrogen-sealed, and cold-stored at minus 20 degrees Celsius or colder? Is shipping domestic? A serious supplier answers all of these clearly and immediately. If you get vague answers or marketing language instead of specifics, that tells you what you need to know.
Q: Did Peptide Sciences get shut down by the FDA?
A: No verified evidence supports that claim. Peptide Sciences posted a notice stating they voluntarily decided to discontinue operations. No enforcement action has been publicly confirmed, linked to the closure, or documented in any court or agency record. The claims spreading across YouTube videos, forums, and blog posts are not based on verified information. They are assumptions built on a three-sentence notice. As a USA manufacturer in this industry (it’s a very small world. We all know each other), we are not going to perpetuate rumors we know to be untrue. What is documented is a voluntary closure. That is it.
Q: How quickly can I get research peptides from Cenexa Labs?
A: Orders ship same day via expedited domestic carriers and arrive within 2-3 business days anywhere in the contiguous United States. $9.95 flat rate shipping on all orders and orders over $300 ship free