Running out of time so have to just post links and come back to this later, but this looks very interesting:
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Acetyl-DL-leucine improves gait variability in patients with cerebellar ataxia—a case series
cerebellumandataxias.biomed...
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Effects of acetyl-DL-leucine on cerebellar ataxia (ALCAT trial): study protocol for a multicenter, multinational, randomized, double-blind, placebo-controlled, crossover phase III trial