GHK Cu Peptide The benefits, side effects, and more [2026] 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. Peptides are trending in longevity and biohacking circles. But what does the science actually say? Some peptides have robust human clinical trials, while others are based only on animal studies or GHK CU: Is it normal to sting so much? : r Peptidesource