glutathione deficiency treatment is critical for NK cell-mediated immunity: Cell Reports Vitamin C and glutathione supplementation:

3 Consequently, it should come as no surprise that mitochondrial dysfunction has been linked to the pathophysiology of many chronic diseases, like neurodegeneration (e.g., Parkinsons disease) and heart failure

The present study suggests that increased expression of PAR-1 in astrocytes in Parkinsons disease brain regions is beneficial for neuroprotection in the pathological process of PD (Ishida et al., 2006)

Dahl D, Onishi Y, Norwood P, Huh R, Bray R, Patel H, et al

The differential equations are then solved to determine the steady-state values of the concentrations of all the variables and the steady state rates of all the reactions

You can find plain glutathione over-the-counter, but its not worth taking because your gut breaks it down before you can use it