They dont just mask fatigue
In summary, GHK-Cu acts as a molecular coordinator : stimulating collagen synthesis, recruiting cells to the wound site, forming new vessels, and neutralizing stress signals
serves on the science advisory board of the UK Dementia Research Institute at Imperial College London, Life and Health Sciences Research Institute of the University of Minho School of Medicine, the Lyon Neuroscience Research Center, Alector, Muna Therapeutics and T3D Therapeutics
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specifically that glutathione can shift the production of eumelanin to pheomelanin and decrease the production of the enzyme tyrosinase, both of which support a gradual reduction in hyperpigmentation and uneven skin tone