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Paris 91 (3-5), 173178

Journal of Physiology-Paris, 94(2), 139151

Beef liver is one of the best options

A 2018 review in the International Journal of Molecular Sciences analyzed available gene expression data and found that GHK-Cu at clinically relevant concentrations affected the expression of approximately 31.2% of human genes [2]

GHK-Cu contains copper ions that can interact with other peptides amino acid sequences, potentially causing aggregation or reducing bioavailability

The selective degeneration and loss of dopaminergic neurons in the substantia nigra of the ventral mid brain lead to dopamine depletion in the striatum causing oxidative stress and mitochondrial damage