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The same source also makes an equally important point: for newer, unapproved peptides marketed as research only, rigorous human safety data are scarce, and the potential for harm includes contamination, incorrect dosing, and unknown long-term effects

let absorb before styling Injectable form (requires prescription, available through licensed compounding pharmacies): Injectable GHK-Cu is used in clinical protocols for broader anti-aging and tissue repair applications

The peptide is derived from a partial sequence of a larger protein identified in human gastric juice, first characterized in the early 1990s

GMC: Contributed important intellectual content

Mean gray values (the ratio of integrated density to area) were automatically calculated for fluorescence intensity measurements