Glutathione levels naturally decline as you age
Randomized, double-blind human trials have shown that GHK-Cu application produces a 55.8% reduction in wrinkle volume and a 32.8% reduction in wrinkle depth compared to controls over 8 weeks
Ma WH, Li M, Ma HF, Li W, Liu L, Yin Y, et al
That distinction matters for understanding where copper peptides fit in a hair restoration context
NeuroReport 7:18331836 Raps SP, Lai JC, Hertz L, Cooper AJ (1989) Glutathione is present in high concentrations in cultured astrocytes but not in cultured neurons
The presence of glutamic acid is particularly critical because it starts the synthesis process Supporting Antioxidant Enzymes through Nutrition Besides glutathione peroxidase, other antioxidant enzymes like superoxide dismutase are vital for reducing free radical formation