A 1999 study in Wound Repair and Regeneration reported that GHK-Cu-treated wounds showed 44% faster closure rates and significantly higher tensile strength at day 14 post-wounding
Since human clinical trials are essentially nonexistent, the available data comes from anecdotal reports from the biohacking community
Research in the Journal of Agricultural and Food Chemistry confirmed that liposomal encapsulation increases the bioavailability of glutathione by approximately 40-fold compared to free-form oral administration, driven by protection from intestinal degradation and enhanced mucosal absorption
Several studies of centenarians (humans who have lived to be over 100 years old) in various countries, including Poland, Italy, and Denmark, have found very high levels of glutathione in their cells
It has been shown that 7.4% of all marathon runners and 1.4% of the UK military population suffer from its effects (Baker-Davies et al, 2017)