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Unlike small-molecule drugs that are chemically stable across a wide range of conditions, peptides can hydrolyze, oxidize, and aggregate under conditions most people would consider normal, such as room temperature, moderate humidity, or standard kitchen lighting

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Ethics declarations Conflicts of interest The authors report no conflict of interest

In a landmark human trial comparing topical GHK-Cu to vitamin C and retinoic acid (tretinoin), GHK-Cu produced measurable collagen increases in 70% of study volunteers outperforming both comparator treatments (Abdulghani et al., 1998)