Surprisingly, there is weak correlation between blood GSH and vitamin B 12 levels even in diabetic patients (both vitamin B 12 deficient and otherwise)
Maybe we can incorporate this into My grapharticle about fasting benefits An interesting future research would be to extend all markers measurements into a post fasting period, as it is well known that the manner of coming out of the water fast can and often does ruin all the discernable benefits of it.

Sources Antioxidant Deficiencies in Hospitalized Dogs and Cats [State of the Art Lecture] - WSAVA2008 - VIN Effect of glutamine on glutathione kinetics in vivo in dogs - ScienceDirect Selected biomarkers of oxidative stress in healthy Beagle dogs: A preliminary study Reactive oxygen species, glutathione, and vitamin E concentrations in dogs with hemolytic or nonhemolytic anemia - Woolcock - 2020 - Journal of Veterinary Internal Medicine - Wiley Online Library Effect of glutamine on glutathione kinetics in vivo in dogs - ScienceDirect Reduced glutathione accelerates the oxidative damage produced by sodium n-propylthiosulfate, one of the causative agents of onion-induced hemolytic anemia in dogs - ScienceDirect Chronic exposure to xenobiotic pollution leads to significantly higher total glutathione and lower reduced to oxidized glutathione ratio in red blood cells of children with autism - ScienceDirect Toxicity of Glutathione-Binding Metals: A Review of Targets and Mechanisms - PMC Clinical Implications of Persistent Organic Pollutants Epigenetic Mechanisms Antioxidant Effect of a Dietary Supplement Containing Fermentative S-Acetyl-Glutathione and Silybin in Dogs with Liver Disease Relationship between Glutathione and the Immune System Glutathione: A key player in autoimmunity - ScienceDirect Glutathione for Food and Health Applications with Emphasis on Extraction, Identification, and Quantification Methods: A Review Can Dogs Eat Tomatoes

Estimation of the global prevalence of dementia in 2019 and forecasted prevalence in 2050: An analysis for the Global Burden of Disease Study 2019
(2015) 7:274ra18
Regulation of apoptosis in normal hematopoiesis and in myeloid leukemias