Research
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 — 6 Vetted Vendors
- 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