Peptide Sciences Alternative — Pure US Peptide
Peptide Sciences voluntarily shut down on March 6, 2026, leaving an estimated 300,000+ monthly searchers without a familiar U.S.-based research supplier. Pure US Peptide was built for the same researcher: HPLC-verified compounds, public COAs, U.S. fulfillment, and a 32-peptide catalog focused on the workhorse research molecules.
What happened to Peptide Sciences
On March 6, 2026, at approximately 2:00 PM Eastern, the Peptide Sciences website went dark. There was no advance announcement, no wind-down period, and no published refund process. For a company that — according to e-commerce analytics firm Grips Intelligence — had generated an estimated $7.4 million in online sales in December 2025 alone, the abrupt departure caught most of the research community off guard.
The shutdown did not happen in a vacuum. Beginning in late 2024, the FDA escalated enforcement against vendors selling GLP-1 receptor agonist research compounds and other molecules that the agency considers unapproved drugs. December 2024 saw warning letters issued to Prime Peptides, Xcel Peptides, SwissChems, and Summit Research. In June 2025, FDA agents conducted a warehouse raid at Amino Asylum, forcing the company offline. By September 2025, the FDA had issued more than 50 additional warning letters across compounders and research-supply manufacturers.
Parallel to the regulatory pressure, Eli Lilly and Novo Nordisk pursued aggressive litigation against vendors selling tirzepatide and semaglutide-class compounds. In March 2024, Lilly filed an International Trade Commission complaint against twelve vendors; in January 2025, the ITC issued a General Exclusion Order blocking infringing tirzepatide imports at the border. The high-margin GLP-1 research segment — which had grown to dominate many vendor catalogs — became commercially untenable.
Industry coverage from Lumalex Law and PeptideLaws.com reads the closure as a strategic exit ahead of the proposed SAFE Drugs Act, which would explicitly prohibit research-chemical sales of compounds that are biologically identical to FDA-approved drugs without a New Drug Application.
Pure US Peptide vs. Peptide Sciences
| Criterion | Pure US Peptide | Peptide Sciences |
|---|---|---|
| Business status | Operating | Closed March 6, 2026 |
| Catalog size | 32 research compounds | ~120 (historical) |
| COA availability | Public, per-batch, on each product page | On request |
| U.S. shipping | Same-day from U.S. fulfillment | U.S.-based (now offline) |
| Payment methods | Card, Zelle, Venmo, Cash App | Crypto-only at end of life |
| Research citations | PubMed-linked per compound | Limited |
Our 32 research-peptide catalog — the workhorses
Pure US Peptide focuses on the compounds researchers actually request, validated to 99%+ HPLC purity with public certificates of analysis. A few of the most-requested research molecules:
- • BPC-157 10mg — connective-tissue research workhorse
- • TB-500 10mg — actin-binding research peptide
- • Ipamorelin 10mg — selective ghrelin-receptor research compound
- • CJC-1295 + Ipamorelin blend — combination research blend
- • GHK-Cu 100mg — copper-tripeptide research compound
- • Tesamorelin 10mg — GHRH-analog research peptide
Why former Peptide Sciences researchers move to Pure US Peptide
- Public COAs. Every product page lists the lot-specific certificate from an independent U.S. lab — no email request required.
- U.S. fulfillment. Same-day shipping from a domestic warehouse. No imports, no border-seizure risk under the January 2025 ITC order.
- Card payments. Major-card checkout still works here. No need to re-learn crypto on-ramps to place a research order.
- Research-only positioning. Every product page, every blog post, every email is labeled for research use only. We do not market weight loss, performance enhancement, or any therapeutic benefit.
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