Peptides
Evidence: moderate_human
GHK (glycyl-L-histidyl-L-lysine) is a naturally occurring tripeptide found in human plasma, saliva, and urine that has an extremely high affinity for copper(II) ions. Even without exogenously complexed copper, GHK rapidly chelates available copper in biological systems, making copper-free GHK functionally similar to GHK-Cu in vivo. The peptide stimulates collagen and glycosaminoglycan synthesis, modulates metalloproteinase activity, resets gene expression patterns toward a healthier state (affecting 31.2% of human genes), and activates wound healing cascades.
Standard: Research indicates 1-3% concentration in topical formulations. Injectable dosing follows GHK-Cu protocols at 1-2 mg daily.
Maintenance: Research indicates ongoing topical use at 1-3% concentration.
Administration: topicalsubcutaneous
Timing: Topical application morning and evening. Injectable in evening.
Duration: Topical use can be ongoing indefinitely. Injectable cycles 8-12 weeks.
GHK without exogenous copper is primarily used in topical formulations where copper content may be undesirable or where the peptide will naturally complex with endogenous copper in the skin. Due to GHK's extremely high copper affinity, it is virtually impossible to ensure no GHK-Cu is present in biological systems. For most applications, GHK-Cu is preferred as it provides the copper cofactor needed for optimal biological activity. GHK without copper may be preferred for clients with concerns about copper exposure or in formulations where copper stability is an issue.
Cosmetic-grade for topical; pharmaceutical-grade for injectable. Note: copper-free GHK is less commonly available than GHK-Cu.
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