IV dosing is uncommon in research settings for GHK-Cu because the brief serum spike does not align well with the peptide's mechanism
Review of Peer-Reviewed Studies on GHK-CU Effectiveness Research from institutions like the Broad Institute and the Connectivity Map has further validated GHK-CU's potential in promoting blood vessel growth and tissue remodeling
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
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For patients losing significant weight on compounded semaglutide or tirzepatide, topical GHK-Cu is sometimes used to support skin elasticity, though specific evidence in this population is limited
