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April 2026 Category 2 Update On April 15, 2026, the FDA confirmed removal of injectable GHK-Cu from Category 2 because the original nominations were withdrawn
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The initial inflammatory response recruits immune cells that clear debris and release signaling molecules that initiate the repair cascade
These are the assays where an effect is most reproducibly reported and also where copper artifacts are hardest to exclude
Oral forms exist for a few peptide drugs, but most peptides have very low oral bioavailability, which limits effectiveness by mouth
