GHK Cu Copper Tripeptide 1 Research Reagent GHK Cu 100mg (Research Only) The FDA just changed the rules on peptides effective April 15, 2026. BPC 157, GHK Cu, MOTS C, and TB 500 have been removed from the Category 2 restricted compounding list. Here is what Peptides! Update as of 4.15.26 from the FDA. We will know more in July. This will allow these previously labeled category 2 research peptides to category 1 and allowable for compounding by