The thing about glutithione is that there are two forms. Reduced and oxidized, and it is this ratio that will show oxidative stress. A very high percentage of the glutithione we need is supposed to be in the reduced form. In this form, it draws electrons from others in conjugation. After it gains the electron, it then becomes very reactive and unstable (the process of oxidation). What is supposed to occur, in this form, is that there is supposed to be a high ratio of the reduced form, in which then the oxidized very radical glutithione reacts with to create the reduced form from the oxidized form. But we dont have a lot of the reduced form. So essentially what happens to the oxidized glutithione? It can't regenerate to the reduced form because there isnt any available to do it. So, essentially, oxidized glutithione becomes a free radical of itself.
Danny, if your glycine is low, and your cysteine is high, look at the pathways connected to glycine, as well as toxins that deplete it. If cysteine is high, then it sounds like your body is trying to get glutithione, but one of the three needed, glycine, to make it, is being blocked or depleted somewhere.