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Gastrointestinal Reactions (Reported/Theoretical) : Some reports suggest possible nausea or digestive discomfort, although consistent human data are lacking

Unlike small-molecule drugs that often have broad, systemic effects, peptides are large enough to target specific biological pathways yet small enough to penetrate tissues and reach injured areas effectively

Publication and enthusiasm bias Finally, much of the accessible GHK-Cu literature is authored by a small number of closely associated researchers and enthusiasts, and negative or null results are less likely to be published or promoted

Advanced Copper Peptide & NAD+ Cellular Energy: Infused with high-purity Copper Tripeptide-1 (GHK-Cu) and NAD+ to revitalize tired skin