The only vitamin deficiency currently known to be directly offensive to epileptics and can cause seizures is Vitamin B6 (pyridoxine). Otherwise, no other nutritional supplement or vitamin has that effect directly on the brain. Having said that the indirect effects of iron deficiency of anemia resulting in lower Oxygen carrying ability of red corpuscles can have deleterious effects on the brain which over time theoretically could cause deterioration of brain tissue which in turn could make it more likely for seizures to occur but this would have to be a very long process before such events would begin to happen. Please rate this answer with STARS if you found it useful to what you were looking for.