roche glutathione Mela B3 Dark Spot Serum With Melasyl™ + Niacinamide cOmplete™, EDTA-free Protease Inhibitor Cocktail

Kamerkar S, Leng C, Burenkova O, Jang SC, McCoy C, Zhang K, et al

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The result feels like being frozen in place from two directions at once

This suggests that excessive GHK-Cu (or other copper peptides) might theoretically push skin MMP-1 concentrations beyond levels supporting healthy collagen production into ranges associated with collagen fragmentation and breakdown seen in older skin with naturally elevated MMP-1