Fat soluble vitamins, once they have been stored in tissues in the body, tend to remain there. This means that if a person takes in too much of a fat soluble vitamin, over time they can have too much of that vitamin present in their body, a potentially dangerous condition called hypervitaminosis (literally, too much vitamin in the body).
If your blood lacks the Rh antigen, it is called Rh-negative. If it has the antigen, it is called Rh-positive. When the mother is Rh-negative and the father is Rh-positive, the fetus can inherit the Rh factor from the father. This makes the fetus Rh-positive too.
Most people have Rh-positive blood, meaning that they produce the Rh factor, an inherited protein found on the surface of their red blood cells. But about 15 percent of the white population and 7 percent of the African-American population lack the Rh factor. These people are Rh-negative. The health of an Rh-negative person is not affected in any way. However, an Rh-negative woman is at risk of having a baby with Rh disease if she conceives a baby with an Rh-positive father and the baby inherits the father's Rh-positive blood type.