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The body composition changes take months because they require sustained IGF-1 elevation to drive lipolysis, protein synthesis, and collagen production at scale
However, its concentration drops significantly with age, by more than half after the age of 60 [2]
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Due to its ability to bind copper ions with high affinity, GHK-Cu is commonly examined as a model peptidemetal complex in studies of cell signaling, extracellular matrix regulation, and gene expression
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