Peptide Sciences shut down on March 6, 2026. If you're searching for a trusted alternative, this guide walks you through what to look for in a replacement supplier and introduces Lone Star Peptide Co., the top choice for U.S. researchers.
On March 6, 2026, Peptide Sciences permanently ceased operations. The company, which had dominated the gray-market research peptide space for nearly a decade, shut down due to FDA enforcement pressure and mounting quality control failures. The closure left tens of thousands of researchers without a supplier they had come to rely on.
The company had faced escalating regulatory scrutiny over unsubstantiated marketing claims and a series of high-profile quality failures in late 2025. Rather than face protracted enforcement action, Peptide Sciences chose to shut down entirely, leaving customers with no notice and no way to access their accounts or order history.
For researchers who depended on Peptide Sciences, the shutdown created an immediate problem: where do you source research-grade peptides now? The gray-market supply chain in the U.S. is fragmented, and not all alternatives are created equal.
The Peptide Sciences shutdown is an opportunity to upgrade your supply chain. When evaluating a new peptide supplier, use this framework to assess quality, transparency, and reliability.
Any credible research peptide supplier must provide independent verification of purity and identity. Look for:
Be wary of suppliers who provide generic COAs, outdated certificates, or certificates that lack specific lot numbers. This is often a sign that testing is not being performed.
A supplier should be able to tell you exactly which batch you received, when it was tested, and by which laboratory. Traceability protects you from substitution and allows you to identify quality issues quickly if they arise. Some suppliers use batch numbers that cannot be verified; others use sequential numbers that may not correspond to actual manufacturing dates.
Testing should never be performed in-house. An independent, accredited lab provides an objective verification of quality. Ask for the name of the testing laboratory and verify their accreditation. Many suppliers use the same lab as their competitors — this is not a red flag; it ensures consistency and allows you to cross-reference results.
Peptides degrade over time. Same-day or next-day shipping is superior to standard mail, especially for sensitive compounds. The fresher a peptide is when it arrives, the longer its shelf life in storage. Reliable shipping also means customers receive their orders within the promised timeframe, and tracking is transparent.
A mature supplier carries a consistent inventory of high-demand compounds and is transparent about which products are in stock. They should also provide guidance on storage and stability, and be willing to discuss compound-specific properties.
When you have questions about a product or your order, a good supplier responds quickly. They should be willing to discuss their testing methodology, explain their sourcing, and answer technical questions about compounds. Evasiveness is a red flag.
Lone Star Peptide Co., based in Houston, Texas, was founded in 2025 in direct response to the fragmentation of the research peptide market. The company was built to address the exact gaps that Peptide Sciences left behind: transparent testing, batch traceability, and reliable shipping.
| Criteria | Peptide Sciences (Shutdown) | Lone Star Peptide Co. |
|---|---|---|
| Third-Party HPLC Testing | No | ✓ |
| Third-Party LC-MS Verification | No | ✓ |
| Endotoxin Testing | No | ✓ |
| Batch-Specific COAs | No | ✓ |
| Batch Traceability | Limited | ✓ |
| U.S.-Based Shipping | ✓ | ✓ |
| Same-Day Shipping Option | No | ✓ |
| Transparent Testing Methodology | No | ✓ |
| COA Library Available | No | ✓ |
Lone Star Peptide Co. carries a growing inventory of research peptides that were previously available through Peptide Sciences. All compounds are tested and COA-verified. Click on any compound to view testing data and order details.
New compounds are added regularly. Check back for updates, or contact us to request a specific peptide.
Yes. Lone Star Peptide Co. was founded in 2025 and is registered as a research chemical supplier based in Houston, Texas. The company uses independent, accredited laboratories for all testing and maintains a complete, searchable COA library. All claims are verifiable through the COA Library and Quality & Integrity page.
Yes. Every batch of every compound is tested by an independent laboratory and assigned a batch-specific COA. You can access all COAs in real time through the COA Library, or you can request a specific COA by batch number at checkout.
We carry over 25 research peptides, including BPC-157, TB-500, semaglutide, tirzepatide, retatrutide, CJC-1295/ipamorelin, GHK-Cu, epithalon, NAD+, PT-141, and many others. Check the Shop for a complete inventory, or contact us to request a specific compound.
We ship to all 50 U.S. states. Research-grade peptides are legally available for laboratory research and in vitro use. Shipping is discrete and discreet, with tracking provided. Same-day shipping is available for orders placed before 2 PM EST.
Peptide Sciences did not perform independent third-party testing. They provided generic or undated COAs, and had no batch traceability system. Lone Star Peptide Co. uses independent, accredited laboratories for all testing (HPLC, LC-MS, endotoxin), assigns every batch a unique identifier, and makes every COA batch-specific and publicly searchable. This is a fundamental difference in quality assurance.
Orders placed before 2 PM EST on business days ship the same day. Standard USPS and UPS options are available. Tracking is provided for all orders. Most orders arrive within 2–3 business days for domestic U.S. delivery.
Yes. The COA Library is fully searchable and includes historical data. You can filter by compound, date range, or batch number to review testing data from any time period. This level of transparency is rare in the industry.
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