Since glutathione is a naturally occurring antioxidant in your body, supplementation simply helps restore levels that decline due to age, UV exposure, and environmental stressors
GHK-Cu is a coordination complex formed when the naturally occurring tripeptide glycyl-L-histidyl-L-lysine binds copper
Liang, F
For the body to resist these damages, it possesses a range of endogenous antioxidants, primarily enzymatic antioxidants (superoxide dismutase (SOD), glutathione peroxidase (GPX), glutathione S-transferase (GST), glutathione reductase (GR), thioredoxin reductase (TrxR), catalase (CAT), etc.), and nonenzymatic antioxidants (glutathione (GSH), bilirubin, ubiquinone, etc.) [11]
The decision depends on your specific situation, your tolerance for uncertainty, and your willingness to use a compound whose clinical track record is, frankly, disappointing despite its theoretical promise
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