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doi:10.2147/CIA.S40348

As a naturally occurring tripeptide complexed with copper ions, GHK-Cu serves as an important compound in peptide-based biochemical research

Both glutathione groups experienced improvements in skin elasticity, but these improvements did not reach statistical significance, compared with placebo

Another study involving female subjects found that copper peptide was more effective than vitamin C and retinoic acid in increasing collagen and reducing fine lines and wrinkles in the skin [13]

Makes skin radiance and improves elasticity

That is why date labeling and adherence to shelf life guidelines matter more than visual inspection