GHK Cu is a small copper bound peptide (glycyl histidyl lysine with a copper ion) found naturally in human tissues and fluids. Its levels decline with age, and it plays a role in tissue repair, regeneration, 7 days on GHK Cu. Here's my honest update. I'm not going to hype this up because the real results don't even start until week 46. But something is already happening. The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 7% GHK CU ACCELERANT Platinum Skin Care Copper Peptides Elmhurst IL Chicago Accelerated Aesthetics Peptide Therapy for Anti Aging, Immunity & Wellness Miami Stem Cell