Check out the website Toxicpuzzle.com. We saw the whole riveting movie, Toxic Puzzle, a few nights ago ( it's first public screening), and there was a discussion afterwards by the movie maker, Paul Cox, and 3 of the research scientists and doctors involved. It is real - and a breakthrough for ALS and Alzheimer's and Parkinson's patients. Therefore, all neurodegenerative diseases including PSP.
This research concludes that the organism responsible is cynobacteria (blue green algae). This is present in many lakes and rivers, but also in the desert and some plants.
The research took many years and many well respected scientists from around the world (several in our community, Dartmouth College, which is why it was shown here).
The good news is that the foods that have been proven to boost the enzyme needed to combat it are common and easy to get. The ones I remember are coconut oil, sweet potatoes, soy, bacon, and most particularly a food supplement L-serine, which is available on line if not locally to you.
They are now recruiting early-onset Alzheimer's patients for a study on L-serine.
I don't believe you can see the whole documentary on line, but you can get a lot of information. It is very exciting - especially as the treatment is affordable and available and can't hurt to try. It may not be a cure, but should certainly slow things down and maybe halt the progression in early cases.
Our L-serine came yesterday, I ordered a bottle of pills and a bag of powder. The powder is bitter and sweet, but easy to take in a fruit smoothie. The pills might be easier for some. The bag says to take 1/2 rounded teaspoon daily as a supplement. A friend who asked the panel afterwards was told one tablespoon twice daily. So I will take the small dose and give my husband the big dose.