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ebei B, Nikoli V, Sikiri P, et al

Since glutathione deficiency and oxidative stress often contribute to nervous system conditions, glutathione supplementation may reduce symptoms and slow disease progression

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(2025) called the absence of clinical permeation data "surprising" given how widely GHK-Cu is marketed

They play a supportive role by helping maintain skin repair and resilience, complementing more powerful active ingredients rather than replacing them