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GHK-Cu (glycyl-l-histidyl-l-lysine-copper), also called copper tri-peptide, is a naturally occurring copper-binding peptide found in human plasma, saliva, and urine

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Expected outcomes compared to typical interventions: faster gains in lean mass versus resistance training alone, shorter return-to-training intervals versus standard rest, and reduced post-exercise inflammatory markers versus placebo

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However, this often means taking supraphysiological doses, which may increase the risk of side effects like joint swelling and insulin resistance