Disclaimer: The following information is not medical advice and is based on animal studies, preclinical research, and consumer testimonials
These two research directions overlap in the literature but represent distinct lines of inquiry, each rooted in a different aspect of the peptides mechanism
A 2016 study published in Nature Scientific Reports directly compared copper compounds and found that while copper chloride and copper acetate were highly cytotoxic, GHK-Cu showed no cytotoxicity across all tested concentrations and did not induce inflammatory markers
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The blue color is a useful spectroscopic and visual handle for monitoring copper complexation, for assessing the integrity of the complex in solution, and for distinguishing the copper-bound form from the apo-peptide (which is colorless or pale)