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A larger phase IIb trial of intranasal glutathione (300 mg/dose, three times daily for 3 months, n=45) also showed no significant improvement over placebo (Mischley et al., J Parkinsons Dis, 2017) [52]
Free Cu2+ is toxic (Fenton reactions, hydroxyl radicals), but the GHK-Cu complex is stable, diffusible and delivers copper in a targeted manner to copper-dependent metalloenzymes: lysyl oxidase (collagen/elastin crosslinking), Cu/Zn superoxide dismutase (SOD1, antioxidant defence), tyrosinase (controlled melanogenesis), dopamine-beta-hydroxylase
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