does glutathione increase glutamate Central Role of Metabolism in the Maintenance of Nitrogen Homeostasis in Normal and Hyperammonemic Brain Glutathione Synthesis via the Cystine/Glutamate...
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HOOK GST Protein Spin Purification (Yeast): Isolation from yeast
As far as I know (I'm not medically trained or a scientist) overdosing B12 is unlikely as excess passes out in urine

Sosne G, Kleinman HK, Springs C, Gross RH, Sung J, Kang S
DIHEXA is often referred to as a natural nootropic and is believed to enhance cognitive function by improving neurotransmitter efficiency

Always consult a healthcare professional before starting glutathione if you have a history of respiratory sensitivity