Does vit b help prevent seisures. i take it now and seems to help. the exercise may help also trsining for ironman?

No: In general if you have a seizure disorder, you need to see a neurologist. B vitamins is a huge family of vitamins. Generally they do help neurological function and yes, it also is a good idea if you exercising and preparing for an ironman competition. B vitamins in and of themselves do not prevent seizures, but they can help as most nutrients can like fish oil, co q 10 and good multivitamin.