Research articles, vendor comparisons, and quality guides for the laboratory research peptide community. All articles are written for qualified researchers and reflect current market conditions as of 2026.
Vendor Shutdowns — What Happened
The research peptide industry lost four major vendors between mid-2025 and early 2026. Each article below covers what happened, why, and where to source the affected compounds now.
- What Happened to Peptide Sciences? — Voluntary closure, March 6, 2026. $7.4M/month operation, gone.
- What Happened to Amino Asylum? — FDA raid, June 2025. Criminal charges for testosterone-adulterated SARMs.
- What Happened to Paradigm Peptides? — Founder pleaded guilty to federal charges, December 2025.
- What Happened to Science.bio? — Voluntary closure, January 27, 2026. Read the regulatory environment and exited.
- Research Peptide Vendors Still Operating in 2026 (Hub) — The verified list of US vendors still operating, with COA standards compared.
Vendor Alternatives
- Peptide Sciences Alternatives — Where Researchers Source Now
- Science.bio Alternatives — Where to Buy After the Shutdown
- Royal Research Alternatives — Where to Buy Now
- Peptide Tech Labs Alternatives — Where to Buy Now
- Amino Asylum Alternatives — Where to Go After the FDA Raid
- Paradigm Peptides Alternatives — After the Criminal Charges
- Core Peptides Alternatives — Comparison Guide
- Best Research Peptide Vendors 2026 — Who’s Left and What Changed
Peptide Comparisons
- Tirzepatide vs Semaglutide — GLP-1 monoagonist vs dual GLP-1/GIP agonist. Receptor profiles, structure, research applications.
- Retatrutide vs Tirzepatide — The triple agonist (GLP-1R + GIPR + GCGR) vs dual. What GCGR activation adds.
Regulatory & Industry
- RFK Jr. Peptide Reclassification 2026 — April 2026 HHS announcement: ~14 peptides return to Category 1. What it means and what it doesn’t.
- SAFE Drugs Act (H.R. 6509) — The proposed legislation that would prohibit research chemical sales of compounds identical to FDA-approved drugs.
Peptide Glossary — What Is…?
- What Is Semaglutide? — GLP-1 receptor agonist overview
- What Is Tirzepatide? — GLP-1/GIP dual agonist
- What Is Retatrutide? — Triple agonist research guide
- What Is CagriSema? — Semaglutide + cagrilintide combination
- What Is BPC-157? — Body Protection Compound research guide
Peptide Biology Hub
- GLP-1 Receptor Biology — Complete Research Guide — Receptor structure, signaling cascade, and the full peptide landscape (semaglutide, tirzepatide, retatrutide, CagriSema).
Quality & Documentation
- How to Read a Peptide COA — What to verify before you order
- How We Test Every Batch — 6-Test Safety Panel