The URL of one study was cut off.
Supplementing diet with amino acid successfully staves off signs of ALS in pre-clinical study:
https://www.sciencedaily.com/releases/2020/02/200224102022.htm
From the study you posted:
“The research builds on earlier findings from Dr. Davis and colleagues in a 2016 study that demonstrated cyanotoxin BMAA can cause changes in the brain that resemble Alzheimer’s disease in humans, including neurofibrillary tangles and amyloid deposits”.
The link to that toxin is interesting.
My ex-wife was diagnosed with MS over 18 years ago. She has had benefit from nutrition, and various supplements. I have seen results literally before my eyes.
Two things I would take seriously to do are Hyperbaric oxygen and high dose vitamin c.
Both are GOD’s products. Nothing is more powerful than that.