 You don't want to be at the lower end of the margin. So if your magnesium is saying it's normal on your blood test, well, if it's not 2.2 and above, you're magnesium deficient. If your vitamin D is 40 and 50, you're on the lower end of normal. You want to be on the maximal end of the normal range. So keep in mind, vitamin D has to be regulated according to your blood levels.