glutathione is an important peptide antioxidant found in cells Metabolism - overview Is Glutathione the Master Antioxidant?
Description
It is a synthetic fragment related to thymosin beta-4, a natural protein found in many tissues involved in healing

Patels research on GSH delivery into the human body
Association of maternal serum copper during early pregnancy with the risk of spontaneous preterm birth: a nested case-control study in China

From Lai and Clark (1976)

GST loses its ability to bind Glutathione-Superflow Resin when denatured, and consequently strong denaturants such as guanidine-HCl or urea must not be used in the purification buffers