Transdermal Magnesium Chloride therapy can absolutely help ataxia... it may even stop it altogether. Do a Google search using the words Ataxia and Magnesium and you will find a great deal of information that shows how magnesium deficiency in people often results in ataxia and often is present in people with illnesses of which ataxia is one of the effects.
You can get Ancient Minerals Magnesium oil from LL's Magnetic Clay Co
And read the book on Transdermal Magnesium Therapy available here: http://drsircus.com/books/e-book/transdermal-magnesium-therapy/
Magnesium is helpful with many types of neurological symptoms.