What's a realistic timeline to see skin improvements from GHK-Cu?

Topical GHK-Cu (serum/cream) at reasonable concentrations, expect 6-8 weeks for visible texture/tone shifts. Injected GHK for systemic skin effects — more variable, usually 8-12 weeks. Don't expect overnight miracles.

Running tret already. wanted something to layer. thanks.

Honestly, tretinoin + SPF + sleep + not destroying your skin barrier will do more than most peptides. GHK is nice. It's not magic.