"Additionally, both type 1 and 2 diabetes are associated with low glutathione. [1-9] The resulting oxidative stress and depletion of the cellular antioxidant defense system contributes to the progress of coronary artery disease. This plays a major role in the development of diabetes and its ongoing complications.
Glutathione in its role as a free radical scavenger has been shown to drastically reduce the occurrence and duration of oxidative stress. Enhancing cellular glutathione is therefore of paramount importance in managing diabetes and reducing negative medical outcomes."
https://www.glutathionereporter.com/glutathione-and-diabetes/
"First and foremost, like most disease, diabetes will cause a significant decrease in your body’s production of the glutathione molecule. Glutathione is critical to good overall health through numerous pathways, and this deficiency can lead to other health problems, uncontrolled inflammation, and free radical damage."
http://glutathionepathway.com/diabetes-glutathione/
"Diabetes causes a significant decrease in the precursors needed to synthesize Glutathione in the body. Namely cysteine and glycine.
Patients with uncontrolled type 2 Diabetes almost always have a severe Glutathione deficiency. Glutathione is not only important for Diabetics to supplement, it is vital for a long and healthy life regardless of your health situation."
https://glutathionepro.com/glutathione-and-diabetes/
Glutathione Synthesis Is Diminished in Patients With Uncontrolled Diabetes and Restored by Dietary Supplementation With Cysteine and Glycine
https://diabetesjournals.org/care/article/34/1/162/27362/Glutathione-Synthesis-Is-Diminished-in-Patients
Glutathione metabolism in type 2 diabetes and its relationship with microvascular complications and glycemia
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5991679/
Glutathione deficiency in type 2 diabetes impairs cytokine responses and control of intracellular bacteria
https://pubmed.ncbi.nlm.nih.gov/22546856/