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Preclinical studies document significant brain concentrations after systemic (including oral) administration, with behavioral improvements in hippocampal-dependent tasks confirming functionally relevant CNS penetration (PMID: 23055539)

Q: If GHK-Cu contains copper should I be worried about copper toxicity

What doesn't stack well : Avoid combining AHK-Cu with other copper-delivering peptides simultaneously (like taking AHK-Cu and GHK-Cu at the exact same moment without spacing)

This receptor sensitization could contribute to the protein synthesis, cellular repair, and tissue regeneration outcomes observed across multiple preclinical models, from connective tissue to neural and smooth muscle

Biological changes occur at the cellular level before becoming visible