The abstract was disconcerting to me,also. May explain the negative results from the placebo controlled study conducted in florida testing dr. david perlmutter's protocol of IV glutathione.(hauser, et al, 2009).
though it was a very small study lasting a very short period of time.

Northwest Parkinson's foundation reported upon the results of the 2 studies using IV glutathione

http://www.nwpf.org/wellness/Physica...97&headerbar=4

[two studies reported in this article] thus far ask the question, “Does glutathione improve symptoms in PD?”... a topic of debate in the medical community, because no one has been able to propose a mechanism by which glutathione might offer symptomatic relief. Continued interest in glutathione explores this molecules anti-oxidant properties. The loss of glutathione in the substantia nigra precedes PD symptoms by more than a decade, and occurs prior to the formation of Lewy bodies, considered a PD precursor. Just because low glutathione levels correlate with PD severity, doesn’t mean that the loss of glutathione causes the disease. This is highlighted by the fact that glutathione is decreased in many diseases including cancer, vascular disease and other diseases of aging. We have no idea whether glutathione has the potential to retard disease progression, as the study has not yet been done..."