GHK Cu Therapy: Skin Rejuvenation & Healing The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, GHK CU aka the beauty peptide. I've got the reconstitute and dose chart at the end for reference. Where I purchase mine from Elite Peptides Australia Discount code WISHY10 (because who doesn't love Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack?