Hello, well, I guess you just did not find the studies because they are there. Do not use DMAE internally if you have dystonia. DMAE increases acetylcholine, and dystonia has to do with acetylcholine and dopamine imbalances. Do not misunderstand. It will not cause dystonia but it could aggravate the condition in someone that has it. It is safe to take. Used for ADD in children, cognitive enhancement in adults, and in facial creams to firm the skin.
Sal