glutathione peroxidases peroxidase-1 and neuromodulation: Novel potentials of an old enzyme Glutathione peroxidase enzyme molecule -
Description
Below is a good Youtube video to watch about B12 deficiency

The authors suggested that the origin of these volatile sulfur-containing compounds is via -lyase reactions on the corresponding cysteine S -conjugates

2020QNCXRC07)

The normal function of the system X c - is crucial for maintaining intracellular redox balance

Since the majority of the glutathione you take orally is going to be destroyed in your stomach, you won't get the full benefit of the glutathione you're paying for
