Intelligence for peptide industry operators.

In a six-month window from June 2025 through March 2026, the “research peptide” market that operators have spent years routing around quietly lost three of its most-recognized US suppliers. The end of Peptide Sciences — which on March 6, 2026 announced it had “voluntarily” shut down operations — closed a market structure few outside the operator class fully tracked. The vendors walking into the gap are smaller, newer, and operating under regulatory conditions that have changed materially since 2024.

This is a public-record summary of what happened, and a forward-looking question every peptide-adjacent operator should be answering by July: which vendor in your supply chain is one warning letter away from the same outcome.

Continue reading — full brief delivered to subscribers Tuesday, May 19 at 9am ET.