Guides
Plain-English guides on research peptide vendors: how it works, what it costs and what to watch out for.
- Guide
FDA Peptide Regulation in 2026: Warning Letters, RUO Rules & What Changed
How FDA treats research-use-only peptides in 2026: the intended-use rule, what the warning letters cite, the Category 2 list, the July 2026 advisory vote and state actions.
4 min read · Updated Sep 2026
- Guide
How to Read a Peptide COA (2026): Purity, Identity, Lot & Red Flags
A field-by-field guide to research peptide certificates of analysis: what each section means, how to verify it, and the red flags that point to a weak or fake COA.
4 min read · Updated Sep 2026
- Guide
Janoshik vs Finnrick (2026): How Peptide Testing Differs & Which to Trust
Janoshik is a lab that tests submitted samples and issues verifiable reports. Finnrick aggregates customer-submitted tests into public vendor ratings. Here's how to use each.
4 min read · Updated Sep 2026
- Guide
Peptide Vendors That Shut Down (2025-2026): A Sourced Timeline
A dated timeline of research peptide vendor shutdowns, FDA warning letters and prosecutions from December 2024 to September 2026, with a source for every entry.
4 min read · Updated Sep 2026