For hair specifically, community routines more often pair a copper-peptide serum with microneedling and with established topicals rather than stacking two peptides
Follow the handling and discard limits for the exact products used
Always consult with a qualified healthcare provider before beginning any new protocol, supplement, or medication.
2007, PMID 17703734) tested AHK-Cu on isolated human hair follicles and dermal papilla cells in culture at picomolar-to-nanomolar concentrations not as a topical product on people
This post covers the part that matters just as much: how much, how often, and how to actually use it
See GHK-Cu Reconstitution, Daily Units, and Cycle Structure in the Perfect B Peptide Protocol Tool