Does GHK Cu actually mess with other peptides or is it more about how things are formulated? From what I've been learning, most of the issues people talk about come down to Four reasons this serum belongs in your routine. GHK Cu Peptides that firm and support collagen renewal. Barrier support to keep your skin healthy and resilient. No injection. No needles. No clinic visit. Why is the injection site painful after administering GHK Cu (Glycyl L Histidyl L Lysine Copper) 2mg mixed with normal saline? GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B ANAIRUI Copper Peptides GHK Cu Serum GHK Cu Copper Peptide Collagen, Skin Rejuvenation & Hair Restoration