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Selective impairment of this carrier-mediated transport can contribute to selective vulnerability of tissues to specific toxins: for example, chronically ethanol-fed hepatocytes become selectively depleted of mitochondrial glutathione because of defective carrier-mediated transport, which makes the hepatocytes susceptible to damage by reactive oxygen species generated from the oxidative metabolism of ethanol (22)

It shields cells from the harm that is caused by reactive oxygen species and their oxidative impacts

Enhances Immunity - Glutathione supports our immunity by augmenting the activity of T-cells which are white blood cells and exert an immediate immune response in fighting bacterial and viral infections

doi: 10.3390/nu8040193 12 BajtM

"The catalytic mechanism of glutathione reductase as derived from x-ray diffraction analyses of reaction intermediates"

It's not connected to weight gain