IUs

The government says 2,000 IUs is the upper daily limit for anyone over a year old.

Pediatricians say kids need more vitamin D 2008

The Institute of Medicine suggests 400 International Units, or IUs, a day for adults, but some experts believe 800 IUs or more a day may be beneficial.

Women fall more, not less, after large dose of vitamin D 2010

For example, 100% of the current Daily Value for vitamin A is 5,000 IUs—which is over the Institute of Medicine's safe upper limit of 2,000 IUs for children and far beyond the RDA for children ages 1 through 3 of just 1,000 IUs.

Multivitamins: So Many Types, So Many Labels Melinda Beck 2011

In fact, most Americans need 600 IUs per day, according to a 2010 report from the Institute of Medicine.

Multivitamins: So Many Types, So Many Labels Melinda Beck 2011

Infants who are being breastfed should get 400 International Units IUs a day of supplement vitamin D until they are weaned.

Multivitamins: So Many Types, So Many Labels Melinda Beck 2011

A normal dose recommended by the Institute of Medicine is 600 IUs a day, says Vin Tangpricha, associate professor of medicine in the division of endocrinology at Emory School of Medicine.

Women fall more, not less, after large dose of vitamin D 2010

Infants who are being breastfed should get 400 International Units IUs a day of supplement vitamin D until they are weaned.

Multivitamins: So Many Types, So Many Labels Melinda Beck 2011

Most experts feel — and I recommend to patients — at least 1,000 IUs a day as the minimum, especially in women with osteoporosis, Tangpricha says.

Women fall more, not less, after large dose of vitamin D 2010

In fact, most Americans need 600 IUs per day, according to a 2010 report from the Institute of Medicine.

Multivitamins: So Many Types, So Many Labels Melinda Beck 2011

The Institute of Medicine suggests 400 International Units, or IUs, a day for adults, but some experts believe 800 IUs or more a day may be beneficial.

1 in 5 kids get too little vitamin D 2009