“…There are several lines of evidence indicating that antioxidant mechanisms are disturbed during depression, namely total antioxidant capacity (TAC) [3,4,6,29], non-enzymatic antioxidant molecules [glutathione (GSH) [30], coenzyme Q10 [31], alpha-tocopherol [32] and ascorbic acid [14]] fall, while enzymatic antioxidants, like glutathione peroxidase (GSH-Px) [11,30], catalase (CAT) [5,11], and superoxide dismutase (SOD) [5,6,8,10] show a trend to fall in depressed patients. This conclusion appears to be questioned by some reports, which indicated a rise of activities of glutathione reductase (GSH-R) [25,30] and GSH-S-transferase [25] in the late stage of the illness, without alteration in GSH-Px activity [3,25].…”