: Anticancer Res. 2003 Mar-Apr;23(2B):1411-5.
The antioxidant system.
Bounous G, Molson JH.



The glutathione (GSH) antioxidant system is the principal protective mechanism of the cell and is a crucial factor in the development of the immune response by the immune cells. Experimental data demonstrate that a cysteine-rich whey protein concentrate represents an effective cysteine delivery system for GSH replenishment during the immune response.

Animal experiments showed that the concentrates of whey protein also exhibit anticancer activity. They do this via the GSH pathway, the induction of p53 protein in transformed cells and inhibition of neoangiogenesis.

PMID: 12820403 [PubMed - indexed for MEDLINE]

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Elevated glutathione as a therapeutic strategy in Alzheimer's disease -
DA Butterfield, CB Pocernich, J Drake - Drug Development Research, 2002

GSH levels are increased with strict adherence to a diet rich in whey proteins. ....whether they're increased in the brain is probable but needs demonstration.

....The bioavailability of NAC given orally is less than 20%.

Lots of good info here:

http://www3.interscience.wiley.com/c...17480/PDFSTART