What is the daily recommended intake of vitamin D for adults?

The daily recommended vitamin D intake for adults up to the age of 70 is 600 IU, or, 15 micrograms, according to the U.S. Department of Health and Human Services' National Institute of Health. In persons over the age of 70, the recommended allowance is 800 IU, or, 20 micrograms.

The recommended intake levels are best obtained through a combination of healthful practices, including moderate exposure to sunlight, a well-balanced diet including vitamin D-rich foods and vitamin D supplements. Though naturally present in few foods, cod liver oil, salmon flesh and fortified milk are optimal sources of Vitamin D, states the National Institute of Health.