Why Are People Injecting Themselves with Peptides? The New Yorker Beyond the Headlines: FDA Warning Letters to GLP 1 Compounders Spencer Fane The FDA just put peptides like BPC 157, TB 500, and KPV on the clock. , As a compounding pharmacist, this is literally my world and most people dont understand the regulatory nuance behind what FDA Warning Letters 2025: Trends, violations, and how to avoid them