what is glutathione in riboflavin an antioxidant: a review update | British Journal of Nutrition 10.41 Riboflavin Functions | Nutrition
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27 Glutathione thus shifts the equation of melanogenesis from eumelanin to pheomelanin through reactions between thiol groups and dopaquinone through formation of sulfhydryl-dopa conjugates

I'd recommend, whilst we all try to avoid going to clinics

[24] At chemical synapses, glutamate is stored in vesicles
Structural studies on a mitochondrial glyoxylase II

doi: 10.1038/ni.2512 39 DinanTGBorreYECryanJF

There was some controversy a number of years ago here, but I think thats behind them now