glutathione is used for Glutathione- The Ultimate Antioxidant — Purifi IV Glutathione Cream for Skin Brightening:

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Introduction Glutathione is a tripeptide found in many tissues at relatively high concentrations, namely 110 mM in cells, similarly to glucose, potassium, and cholesterol, with a critical role in several physiological processes, such as redox balance preservation, reduction of oxidative stress through detoxification from xenobiotic and endogenous compounds, and immune system modulation (1)

Here are some key benefits: *Immune System Support: Enhances the bodys defense against infections and diseases

However, even when large oral doses are administered, most of the absorbed glutathione remain within the gut luminal cells and only small and transient increase of glutathione occurs in the circulation