oral glutathione supplement evidence as a skin whitening agent: Facts, myths, and controversies 15 Glutathione Benefits: How to
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Au et al

Antioxidant protection: GHK-Cu peptides neutralize harmful molecules that can age skin prematurely

doi:10.1021/cr300163e Truong TH, Carroll KS (2013) Redox regulation of protein kinases
In other words, reliance on exogenous glutathione can induce metabolic complications or reduced endogenous production, as the bodys regulatory feedback mechanisms respond, which can cause more problems than the lack of ones own secretion and synthesis of glutathione

Z Lebensm Unters Forsch 192(5):427429
