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The research perspective For those using GHK-Cu in a research context , timing considerations extend beyond skincare optimization to experimental design and data validity

High copper levels may contribute to oxidative stress, neurological issues, or imbalances

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Since cysteine is known to be neurotoxic in excessive amounts [32], treatment with N-acetylcysteine should not be recommended for patients with glutathione synthetase deficiency as this may increase the intracellular cysteine levels even more

Most people need several weeks to a few months of consistent use before judging GHK-Cu

"Glutathione as a skin whitening agent: Facts, myths, evidence and controversies." Indian J Dermatol Venereol Leprol