glutathione vs nad+ NAD Glutathione: What's the Difference? NAD⁺ vs Glutathione: A Guide
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[DOI] [PMC free article] [PubMed] [Google Scholar] 88.Zivanovic-Posilovic G., Balenovic D., Barisic I., Strinic D., Stambolija V., Udovicic M., Uzun S., Drmic D., Vlainic J., Bencic M.L., et al

Other neurodegenerative conditions affecting the basal ganglia dont show this deficiency

Adequate stomach acid is required to release the vitamin from the protein, and a substance called intrinsic factor is necessary to ensure its absorption

This can cause anemia, neurological problems, and fatigue
