Concentrations naturally decline with age (from about 200 ng/mL at age 20 to 80 ng/mL by age 60), which is part of why supplementation makes sense
Moreover, this trial was conducted at a private practice and published in an alternative medicine journal, again raising concerns about bias
The previously mentioned study on rats with open ischemic wounds also reported an apparent decrease in wound area of the GHK-Cu group that was greater compared to the control group on days 3 to 5, 6 to 9, and 11 to 13
The best time to take glutathione is usually in the morning on an empty stomach
Key research themes involving glutathione include: Scavenging of free radicals (e.g., peroxides, nitrogen dioxide, hypochlorous acid) Support of other antioxidant systems (e.g., vitamin C and vitamin E recycling) Detoxification via glutathione S-transferases and related enzymes Regulation of protein folding, disulfide-bond formation, and thiol redox status Modulation of inflammatory mediators, nitric oxide pathways, and cellular metabolism Because endogenous glutathione synthesis capacity appears to decrease with age in many models, glutathione is frequently used as both an experimental variable and a biomarker in studies of aging, disease susceptibility, and redox imbalance
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