To increase cellular glutathione in wild-type cells, alternatively we generated the transgenic lines overexpressing the -GLUTAMYLCYSTEIN LIGASE ( GSH1 ) or GLUTATHIONE SYNTHETASE ( GSH2 ) that encodes the first or second catalytic enzyme required for glutathione biosynthesis
Yes, it is commonly used in fertility and IVF treatment protocols to trigger ovulation and support reproductive therapy

1988 DOI: 10.1016/0014-5793(88)80509-x PMID: 3169264 Read on PubMed Advances in Experimental Medicine and Biology Effects of glycyl-histidyl-lysyl chelated Cu(II) on ferritin dependent lipid peroxidation Miller DM, DeSilva D, Pickart L 1990 DOI: 10.1007/978-1-4684-5730-8_11 PMID: 2244543 Read on PubMed Cosmetics GHK and DNA: Resetting the Human Genome to Health Pickart L, Vasquez-Soltero JM, Margolina A 2014 DOI: 10.1155/2014/151479 PMID: 25210707 Read on PubMed FASEB Journal Tripeptide-copper complex GHK-Cu(2+) transiently activates the inflammatory response in Jurkat T-cells and B-cell lymphoma cells Gruchlik A, Jurzak M, Chodurek E, Dzierewicz Z 2010 DOI: 10.1096/fasebj.24.1_supplement.lb87 PMID: 20639517 Read on PubMed Experimental Dermatology Effect of the tripeptide-copper complex L-alanyl-L-histidyl-L-lysine-Cu2+ on hair growth in C57BL/6 mice Pyo HK, Yoo HG, Won CH, et al
Unfortunately, given the efficacy measure used, it is not possible to compare with other studies