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 50mg Vial Copper Peptide Pure Bio Labs GHK Cu Peptides Serum TryDeloura Close Blue Vial Peptide Blend Next Stock Photo 2682305605 Shutterstock While GLP 1 medications help with weight loss and metabolic health, they can sometimes speed up muscle loss, skin thinning, and collagen decline. Thats where GHK Cu comes in., Known as the copper GHK Cu Peptide: Why This Regenerative Peptide Is Getting So Much Attention