glutathione enzymes peroxidase The Selenoprotein Glutathione Peroxidase 4:

Identification and characterisation of two allelic forms of human alcohol dehydrogenase 2

Regarding conversion, we can cite only a manufacturers claim saying that EAC is metabolized in the skin into pure ascorbic acid (and the ascorbic acid content of EAC is very high - 86,4% - compared to the usual 50-60% Vitamin C content of other derivatives)

Glutathione can lighten dark spots in skin and diminish the appearance of wrinkles

However it also offers a range of other benefits too

Genetic Variation within the Histamine Pathway among Patients with Asthma. The Journal of Asthma : Official Journal of the Association for the Care of Asthma, vol

doi: 10.1002/hep.27265