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While GHK-Cu is the most recognised copper peptide in skincare, AHK-Cu is another cosmetic copper peptide that has become increasingly popular in scalp and haircare formulations
Larger vials exist, but the 5mg format reduces waste if a protocol needs to be adjusted mid-course, and it keeps reconstituted solution within its optimal stability window before a new vial is needed
Many mass-market options use synthetic fillers or cheap binders that can cause sensitivities
The combination protocols produce larger, more sustained pulses through dual receptor activation, with a comparable safety profile and often comparable cost when stacked
For peptides, that means a narrow question: do these nominated substances meet the legal and scientific criteria for compounding under section 503A not whether they work in the wellness sense
