They are almost identical but have a slightly different molecular arrangement ( The form found in foods and supplements is L-glutamine
With this in mind, many think that the larger oral dosage would be more effective and absorb more quickly
While our body can make antioxidants, the modern environment (along with our bodies' natural cellular processes) makes it challenging to keep the balance of antioxidants and oxidative stress in check
Casiglia E, Tikhonoff V, Bascelli A, et al
Free Radical Bio Med 14(3):287293 Holmgren A, Johansson C, Berndt C, Lnn ME, Hudemann C, Lillig CH (2005) Thiol redox control via thioredoxin and glutaredoxin systems
Detoxification is one of glutathiones primary functions