The Molecular Basis of AOD-9604 Selectivity The selective action of AOD-9604 stems from its molecular structure
For researchers studying muscle biology, our muscle growth and recovery guide covers peptides like growth hormone secretagogues and IGF-1 compounds that support muscle anabolism through receptor-mediated signaling rather than enzymatic metabolic restoration
Consult a qualified healthcare provider before beginning any peptide protocol or making changes to your care

This may be due to copper's ability to enhance the expression of metalloproteinases (MMPs).16 MMPs normally regulate the degradation of collagen, and a specific one, MMP-1, may be responsible for the initiation of collagen fragmentation.17 Supporting this, a 2024 study noted that elevated MMP-1 levels appear to contribute to aging skin and that higher MMP-1 levels in mice led to:18 The loss and fragmentation of dermal collagen fibrils Contracted fibroblast morphology Reduced collagen production Increased expression of pro-inflammatory mediators Additionally, a 2016 study found that GHK-Cu significantly increased gene expression of MMP-1 and MMP-2 at the lowest concentration, which the studys authors considered to be one of the reasons the peptide was able to increase collagen and elastin production.19 So, what this could ultimately mean is that using too much GHK-Cu (or other copper peptides) may in theory increase the skins MMP-1 concentration above the levels involved in healthy collagen production, taking it into the collagen fragmentation and breakdown territory seen in older skin with naturally higher MMP-1 levels

AOD-9604, a synthetic growth hormone analogue, has been studied as an investigational agent for several indications 1
B12 shots, a provider can help you decide on what treatment could be most effective for your goals and budget