glutathione ethyl-ester gsh-ee ethyl ester (GSH-EE, GSH ethyl ester, GSH monoethyl ester, CAS Number: 92614-59-0) Glutathione and glutathione disulfide –
Description
Specifically, GHK-Cu promotes the synthesis of new collagen and other matrix components that make skin plumper and more elastic

Characterization of the T-cell-mediated immune response against the aspergillus fumigatus proteins crf1 and catalase 1 in healthy individuals

287,288 This binding initiates typical GPCR signaling, leading to G protein activation and increased intracellular cAMP

For more on the science of metabolic hormones, check UC Davis white paper

Sanders ME, Akkermans LMA, Haller D et al (2010) Safety assessment of probiotics for human use