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Oral glutathione has very low bioavailability

According to research, it appears they do this in two ways: by scavenging free radicals before glutathione has to and by assisting in glutathione regeneration

Glutathione & DepressionRegion-Specific Depletion in the Brain Glutathiones role in psychiatric disordersparticularly major depressive disorder (MDD)has become increasingly evident as research into redox dysregulation and oxidative stress advances

Source data are provided with this paper

The copper in GHK-Cu isn't permanently attached to the peptide

This occurred without major changes in HLA-I heavy-chain gene expression, suggesting a defect in peptide processing rather than MHC synthesis