The specific glycyl-L-histidyl-L-lysine sequence with a copper 2+ complex is what has 50 years of peer-reviewed support behind it
Present in virtually every cell, glutathione plays indispensable roles in detoxification pathways, immune system regulation, DNA synthesis and repair, protein synthesis, and enzyme activation throughout the body
Mitochondrial dynamics in neurodegeneration
It is called insulin-like because its structure looks similar to insulin
However, how long they last and how many cycles you get out of them will greatly depend on how nice you have been to them by not over/under charging them, keeping them at storage voltage, and not letting them get too hot
The two processes are complementary