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Accessed September 8, 2025

These are compounds that: Are not FDA-approved medications they haven't gone through the clinical trial and approval process required for prescription drugs Are not DEA-scheduled controlled substances they're legal to purchase, possess, and ship within the United States Are sold under "research use only" disclaimers vendors label them as not for human consumption, regardless of how buyers actually use them Are manufactured outside the pharmaceutical supply chain produced by chemical synthesis companies rather than licensed drug manufacturers Common grey market peptides include BPC-157, TB-500, Ipamorelin, CJC-1295, GHK-Cu, KPV, Selank, and research versions of GLP-1 agonists like Retatrutide and Tirzepatide

Ongoing monitoring for liver function, kidney function, and other parameters is prudent during extended use

doi: 10.1016/j.celrep.2017.01.063 126 SokerSTakashimaSMiaoHQNeufeldGKlagsbrunM