If you’re reading this, you probably already know: Peptide Sciences voluntarily ceased operations on March 6, 2026, posting a brief notice on their homepage and going silent. No transition plan, no refund guidance, and no timeline for return. For thousands of researchers who relied on Peptide Sciences as their primary supplier — many for years — the shutdown created an immediate and practical problem.
Making matters worse, within hours of the announcement, scam sites began impersonating Peptide Sciences, using similar branding and URLs to capture confused customers. Meanwhile, the broader peptide supplier landscape has been contracting: Amino Asylum was raided by the FDA in June 2025, Paradigm Peptides’ founders faced federal charges in December 2025, and at least seven additional vendors shut down throughout 2025.
The result is a market where trust is harder to verify than ever — and where making the wrong choice means risking your research and your money.
What Happened to Peptide Sciences?
Peptide Sciences was the largest grey-market research peptide vendor in the US, with an estimated $7.4 million in monthly revenue and roughly 990,000 monthly website visits at its peak. They offered one of the broadest catalogs in the industry, held approximately 15,800 backlinks from 1,760 referring domains, and had built substantial organic search visibility.
The shutdown occurred against a backdrop of increasing federal regulatory pressure on research peptide vendors. The FDA had been escalating enforcement actions throughout 2025, and pharmaceutical companies including Eli Lilly and Novo Nordisk filed lawsuits targeting grey-market suppliers of their patented GLP-1 compounds. While Peptide Sciences described their closure as “voluntary,” the timing suggests regulatory and legal factors played a significant role.
What to Look For in a Peptide Sciences Replacement
Switching suppliers isn’t just about finding someone who stocks the same compounds. The Peptide Sciences shutdown — and the broader wave of FDA enforcement — has raised the bar for what serious researchers should expect from a vendor. Here’s what matters most right now:
Independent Third-Party Testing
Any vendor can claim 99% purity on a product page. What matters is whether that claim is backed by independent laboratory testing that you can verify. Look for vendors who publish batch-specific Certificates of Analysis (COAs) with both HPLC (purity) and Mass Spectrometry (identity) results from accredited labs — not in-house testing.
US-Based Manufacturing
Domestic manufacturing means shorter supply chains, consistent quality control, and accountability under US regulatory standards. It also means faster shipping without customs delays or international quality unknowns. In a market rocked by contamination scandals (Paradigm Peptides’ products were found to contain testosterone instead of the labeled compounds), knowing exactly where your peptides are made matters.
Transparent Business Identity
Legitimate suppliers have verifiable business information — a physical location, real contact details, and a company history you can check. Anonymous vendors with no About page, email-only contact, and a domain registered last month are not worth the risk.
Consistent Community Reputation
Check Trustpilot, Reddit’s r/peptides community, and independent testing platforms like Finnrick Analytics before ordering from any new vendor. A strong vendor will have consistent positive feedback across multiple platforms — not just curated testimonials on their own site.
Responsive Customer Support
One of the biggest complaints about Peptide Sciences in its final months was communication breakdowns. A vendor that offers 7-day-a-week support, clear refund/replacement policies, and responsive communication channels is worth paying a premium for.
Why Researchers Are Choosing PSPeptides
PSPeptides was built from the ground up as a quality-first US research peptide supplier — the kind of vendor that the post-Peptide Sciences market demands.
US-Manufactured, Not Imported
Every PSPeptides product is manufactured in-house in the United States. We don’t rebrand Chinese imports or rely on anonymous overseas synthesis labs. Our manufacturing process is controlled, documented, and consistent.
99%+ Verified Purity on Every Batch
Every batch undergoes independent third-party testing via HPLC and Mass Spectrometry before release. We don’t self-certify — our COAs are produced by independent laboratories and posted publicly on our Certifications page. You can verify what we sell.
Same-Day Shipping
Orders placed before 12:00 PM EST ship the same business day via UPS, with full tracking on every order. Free UPS 2nd Day Air shipping is included on orders over $150.
7-Day Customer Support
Our team is available 9AM–10PM EST, seven days a week, via phone, text, and email. We don’t disappear on weekends, and we don’t leave you waiting for answers.
Transparent Quality Guarantees
We offer clear refund and replacement policies because we stand behind what we sell. If there’s an issue with your order, we resolve it — quickly and without hassle.
Product Availability for Former Peptide Sciences Customers
PSPeptides carries the compounds most commonly sought by former Peptide Sciences customers:
| Product | Availability | Sizes | Starting Price |
|---|---|---|---|
| Retatrutide | In Stock | 5mg, 10mg, 20mg, 30mg | $39.99 |
| GHK-Cu | In Stock | 50mg, 100mg | $29.99 |
| GLOW Blend (BPC-157 + GHK-Cu + TB-500) | In Stock | 70mg | $79.99 |
| KLOW Blend (BPC-157 + GHK-Cu + TB-500 + KPV) | In Stock | 80mg | $129.99 |
| Bacteriostatic Water | In Stock | 10mL (Hospira) | $19.99 |
| Laboratory Syringes | In Stock | 10-count, 20-count | $9.99 |
We’re actively expanding our catalog based on researcher demand. If you need a compound not listed above, contact our team — we want to hear what you need.
How to Avoid Peptide Sciences Scam Sites
Multiple fraudulent websites appeared within days of the Peptide Sciences shutdown, using similar domain names and branding to capture displaced customers. Protect yourself:
- Verify the domain carefully. The original Peptide Sciences domain was peptidesciences.com. Variations with extra words, hyphens, or different TLDs (.net, .co, .shop) are not the original company.
- Never order from a vendor with no verifiable COAs. Scam sites will display fake or recycled testing documentation. Check whether the COA includes batch-specific lot numbers that match what you receive.
- Check community feedback. Search Reddit’s r/peptides for any vendor before ordering. The community is quick to identify and flag fraudulent operations.
- Use credit card payments for chargeback protection. If a vendor only accepts cryptocurrency or wire transfer with no recourse options, that’s a significant red flag.
The Bottom Line
The Peptide Sciences shutdown is a loss for the research community, but it’s also an inflection point. The vendors that will earn your long-term trust in 2026 and beyond are those that can demonstrate — not just claim — quality, transparency, and reliability.
PSPeptides is built on exactly those principles: US manufacturing you can verify, independent testing you can check, pricing you can afford, and a team that’s available seven days a week. We’re not going anywhere.
Questions about switching from Peptide Sciences? Our team is here to help: Contact Us or call/text (551) 284-2670, available 9AM–10PM EST daily.