what are the two roles of glutathione as a skin whitening agent: Facts, myths, evidence and controversies Glutathione - PMC
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Cancer J (2014) 20(3):17680

Multi-path support can match the complexity of the problem
Nitrite reduction depends on protonation (Equation (5)), and the histidine delivers the requisite proton(s) via a hydrogenbonding network of water molecules, analogous to bacterial NiRs (Cutruzzol et al ., 2001

It is dehydrated to propionaldehyde by propanediol dehydratase, then oxidized to propionyl-CoA and reduced to propanol by propionaldehyde and propanol dehydrogenases, respectively