My mom and dad take over 65 vitamins a day. They are taking every vitamin they have read about in Prevention magazine. They take these along with prescribed medications like thyroid medicine. My mother often gets indigestion and stomach upset after taking the vitamins. My fathers hands shake and he has begun to be disoriented, have memory loss and many symptoms of dementia. I am wondering if this could be related to the amount of vitamins they take. Is there a particular vitamin that is likely to cause this in high dosages?