On the basis of the anti-oxidative action, glutathione is also as a food additive and sold as a dietary supplement.
Until recently, it was generally assumed that glutathione is broken down into individual amino acids in the gastro-intestinal tract in order to be later created in the cells of the body from its components. This route will be partially, but it is arguably less important than the direct GSH absorption process. Exogenously administered glutathione is in fact also be absorbed directly and incorporated into the epithelial cells, . whereby the intracellular antioxidant defense mechanism of our epithelial cells is improved. The glutathione-transport in the gut is both Na + and Ca ++ dependent.
Glutathione was mixed with anthocyanins under the name Recancostat comp. Mid-90s of the twentieth century in order to prevent cancer sold. It was however a controversial drug.