I am not aware of any good research studies showing the benefit of nutrition and supplements in PSP. This is not to say that there are not benefits of good nutrition and supplementation, but that we dont as yet have the research.
It would be very difficult to establish what is causing the benefit, with such a complex cocktail. In the absense of research specific to PSP we would look to more general advice on good nutrition and hydration, which can be sought from a dietician. As you note supplementation to this extent can be expensive.
We would not encourage the use of IVI for long term hydration.
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