does oxidation state of glutathione depends on cysteine residue Disulfide - an overview Oxidative Cysteine Post Translational Modifications

The impact of exogenous GSH on chilling injury (CI) in postharvest bell pepper fruits stored at low temperatures was mitigated by its role in stabilizing membranes and maintaining organelle integrity through the AsA-GSH cycle

It's more likely with self-injections or when needles are reused

Although the GSH, CD4, and CD8 findings did not reach statistical significance, they could have predictive value for a population that is not yet clinically diagnosed or not yet treated and who could present an increase in symptom severity and progress to a clinically defined psychiatric disorder

doi: 10.1186/s12958-019-0468-9

The enteric nervous system, as it is occasionally known, controls intestinal function and also influences bone metabolism

It is thought by many to be triggered by a viral infection although the exact cause of the nerve damage is unknown