Could taking too many vitamins kill you?

Yes: Certain vitamins, such as vitamin d, which is fat soluble and can build up in body, have levels where they become toxic. The level for vitamin d is 120 ng/ml, .

Yes but VERY rare: In 2008 & 2009 there zero deaths reported from vitamins in the us, whereas about 100, 000 people in the us die each year due to pharmaceuticals. One could die from really high amounts of vit. A but the amounts required are so high it hardly ever happens. The most potentially hazardous supplement is not a vitamin but iron, a mineral, but even deaths from this are rare.