Fat-soluble vitamins, when taken in excess, can pose greater risks than taking too much water-soluble vitamins. This is because excess water-soluble vitamins are often eliminated by the body through urination. Fat-soluble vitamins, on the other hand, are stored in the body's fatty tissue and liver. This means that fat-soluble vitamins can accumulate in your body until it reaches dangerous levels. This could lead to hypervitaminosis.