Deep Dive: Regulatory Status of Popular Compounded Peptides Holt Law GHK CU BPC 157 TB 500 KPV KLOW Blend Simple Peptide Peptides are everywhere right now but heres the part most people miss:, Not all peptides are FDA approved., FDA regulated: insulin, GLP 1 medications, certain hormone peptides, Not What Peptides Are Legal in the U.S.? Understanding FDA Approval, Compounding, and the Legal Gray Areas