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[4] Moreover, research points to a possible interaction between DSIP and opioid receptors in the brain, which may play a role in the peptides ability to regulate sleep and mitigate withdrawal symptoms, underscoring its intricate role in neural signaling pathways

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Skin thickness and firmness: Clinical studies using topical copper peptide formulations documented measurable improvements in skin density, elasticity, and laxity reduction in human volunteers

Some brands use trace amounts of GHK-Cu and still call it a copper peptide serum

While animal studies suggest safety, long-term human studies are lacking