Vitamin D from food and supplements

Info source: http://www.hsph.harvard.edu/nutritionsource/what-should-you-eat/vitamin-d/index.html#vitamin-d-sources-and-function

Very few foods naturally contain vitamin D. Good sources include dairy products and breakfast cereals (both of which are fortified with vitamin D), and fatty fish such as salmon and tuna.

For most people, the best way to get enough vitamin D is taking a supplement, but the level in most multivitamins (400 IU) is too low. Encouragingly, some manufacturers have begun adding 800 or 1,000 IU of vitamin D to their standard multivitamin preparations. If the multivitamin you take does not have 800 or 1,000 IU of vitamin D, you may want to consider adding a separate vitamin D supplement, especially if you don't spend much time in the sun. Talk to your healthcare provider.