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.
1 In other words, if the Rhesus antigen is present in your red blood cells, you're Rh positive (which means you have a positive blood type). 2  But if the Rh antigen is absent from your red blood cells, you're Rh negative (which means you have a negative blood type). The Rhesus antigen is a particular protein only found in the red blood cells of people with positive blood types. 2  In other words, if the Rhesus antigen is present in your red blood cells, you're Rh positive (which means you have a positive blood type).