Studies by Pickart and colleagues published in 2012-2018 showed that GHK-Cu treatment of cultured human fibroblasts altered expression of several thousand genes, with patterns indicating increased expression of genes involved in tissue repair, antioxidant responses, protein synthesis, and cellular rejuvenation
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The 28-day limit comes from the manufacturer label and from United States Pharmacopeia (USP) guidance, not from a guess
doi: 10.1038/sj.ijo.0801740 84 StierHVosEKenleyD
They describe reta as a "next-gen" GLP-1 drug, saying the injectable they are taking helped them cut fat and get lean without the muscle wasting that many people experience on Ozempic, Wegovy, Mounjaro, or Zepbound