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Moreover, in the proximal part of the small intestine following the stomach (SI1), we also found a significant increase in the CYS level in digesta when animals were supplemented 1.0% GSH for a prolonged time (from d0 to 14), as well as a significant increase in the CYS/CYSS ratio of the HGSH group both on d5 and 14

doi: 10.1016/j.freeradbiomed.2015.11.013
& Nordan, R

GSH and GSH-dependent enzymes act in cooperation to scavenge ROS and/or neutralise their toxic oxidising effect