Thanks IMark, must find a source of whey protein in the UK.
If NAC is used as a source of cysteine since NAC is more readily absorbed by the body, yet according to ZF's reference, "....The bioavailability of NAC given orally is less than 20%", then there must be a natural substance in whey protein to assist bioavailability.
Looks like natural sources are often best, so whey protein rather than NAC, and Mucuna pruriens instead of sinemet, (since mucuna P. seems to contain a natural decarboxylation inhibitor, rather than the synthetic carbidopa in sinemet)
Like Zuchini Flower, I found a couple of strange comments in IMarks paper,
"The neurotransmitters are fat soluble and cannot cross the blood/brain barrier." The more fat soluble (lipophilic) a molecule is, the easier to cross the BBB.
I also feel that "Neurotoxic effects are permanent" is wrong, look at Rick's example of AD patients regaining their memory in minutes. If the damage is permanent, we can never be cured.
Ron