It is referred to as a 5th generation ECM booster, what does that mean exactly?

The key ingredient of RE2O, hADM (human Acellular Dermal Matrix), is a material from donated human skin tissue that has had cellular components that can trigger immune rejection removed, leaving only the ECM (extracellular matrix) structures such as collagen, elastin, and hyaluronic acid. It has been used for a long time in burn treatment and breast reconstruction, so there is a fair amount of safety data available. Unlike existing methods that induce collagen production, it is classified as '5th generation' because it directly supplements the already completed dermal structure components.