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Malabsorption Conditions affecting nutrient absorption in the gastrointestinal tract, like pernicious anemia, celiac disease, or Crohns disease, can hinder the uptake of vitamin B12, leading to deficiency

Methamphetamine neurotoxicity: necrotic and apoptotic mechanisms and relevance to human abuse and treatment
This is the only method consistently shown to raise plasma glutathione levels acutely

Glutathione de novo synthesis but not recycling process coordinates with glutamine catabolism to control redox homeostasis and directs murine T cell differentiation