2% GHK CU Blue Copper Peptide Serum Collagen Boosting +EGF + 30% Matrixyl 3000 eBay Turn back time without filters. GHK Cu Copper Peptides help smooth fine lines, boost collagen, and bring back that healthy, youthful glow. Ways2Well GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping GHK Cu Therapy: Skin Rejuvenation & Healing