does ghk cu cause receptor downregulation or desensitization of G protein–coupled kinase 4 protects against kidney ischemia-reperfusion injury GHK‐Cu protects mice against CS‐induced
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[DOI] [PubMed] [Google Scholar] 79.Steinert JR, Chernova T, Forsythe ID

Injectable HCG typically ships in powder form (lyophilized) and needs to be reconstituted before use

This isn't just a minor detail

The original genetic-validation study used antisense oligonucleotide-mediated knockdown of NNMT in adipose tissue of mice on a high-fat diet, with whole-body and adipose-tissue metabolic endpoints measured against scrambled-oligonucleotide controls [2]
