does ghk-cu cause receptor downregulation or tachyphylaxis Expression and Purification of Recombinant GHK Tripeptides Are Able to Protect against Acute Cardiotoxicity from Exposure to Waterborne-Copper in Zebrafish Are We Ready to Measure
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Also, higher levels of glutathione are known to preserve telomeres, which are the tail ends of genes that dictate how many times the cell can regenerate

They are good friends because ethylhexylglycerin can boost the effectiveness of phenoxyethanol (and other preservatives) and as an added bonus it feels nice on the skin too

It's the result of extensive testing to optimize preservation, safety, and compatibility with injectable medications

Antioxidants 8 , 46 (2019)
