9 out of 10 Americans are deficient in potassium.
7 out of 10 are deficient in calcium.
8 out of 10 are deficient in vitamin E.
50 percent of Americans are deficient in vitamin A, vitamin C, and magnesium.
More than 50 percent of the general population is vitamin D deficient, regardless of age.
90 percent of Americans of color are vitamin D deficient.
Approximately 70 percent of elderly Americans are vitamin D deficient.

 A recent clinical trial found that taking a daily multivitamin was associated with up to a 76 percent reduction of risk in nutrient deficiency versus not taking a multiple.