glutathione gssh (GSH), a tripeptide with an active –SH function. GSH Longer Lifespans and Better Health
Description
It should be noted that individual forms of Se are easily transformed under the influence of changes in the soil environment, and inorganic forms of Se may undergo the process of biomethylation to volatile forms of Se: an example is dimethylselenide: (CH 3 ) 2 Se

Nat Biotechnol (2021) 39:35767

Scientific Reports 7 : 11883

In short, its because of convenience

Elevated GSH levels help neutralize ROS by reacting with hydrogen peroxide (H 2 O 2 ), which is produced from superoxide radicals (O 2 - )

doi: 10.1111/hpb.12005
