Oral administration of glutamylcysteine increases intracellular glutathione levels above homeostasis in a randomised human trial pilot study ScienceDirect PDF) Bilirubin and glutathione have complementary antioxidant and cytoprotective roles PDF) Skin whitening and skin condition improving effects of topical oxidized glutathione: a double blind and placebo controlled clinical trial in healthy women Intact protein folding in the glutathione depleted endoplasmic reticulum implicates alternative protein thiol reductants