One study involving mice reveals how glutathione enzymes affect genes that are now found to regulate anxiety. (enzymes not neurotransmitters/chemical imbalances.
Another study involves some neonatal chicks (newborn baby chickens) that were placed in isolation which led to acute stressful conditions.
They were then given glutathione which visibly calmed them and quieted them down. It relaxed them so much that they now displayed sleep-like behavior, in complete contrast to the highly stressful behavior they had been displaying (imagine chicken without a head behavior, no pun-intended).
"In conclusion, glutathione and its derivative have sedative and hypnotic effects, and might be effective in improving psychic stress such as anxiety."
There is great hope for those with anxiety and glutathione is proving to show huge promise in helping those dealing with it.