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Peptides in solution may bind to container surfaces, especially at low concentrations
Topical effects Most reported topical effects are mild and local: redness, tingling, dryness, or transient irritation at the application site, typically more common with concentrations above 4%
Just know that injecting this one is notorious for feeling like a sting of a wasp
Strongest human evidence (topical) The Leyden 2002 photoaging trial in 71 women applied a GHK-Cu facial cream for 12 weeks and reported measurable improvements in skin density, thickness, fine lines, and laxity
Scientists often examine the peptide in laboratory models that look at endothelial cell behavior, fibroblast movement, and nitric-oxide related pathways
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