GHK supresses human cancer metastasis genes but because of the cell culture system used, it is likely that the GHK was converted to GHK-copper. GHK-copper also increases the protein Decorin (Named because it "decorates" the collagen strands). Decorin has a perplexing mixture of effects: Regeneration of muscles and nerves, reduction of scarring, and inhibition of tumor growth and cancer metastasis in animals.


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