Here is a realistic game plan to increase the amount of vitamin D you get on a daily basis:

1) check your multi vitamin/mineral supplement, most have 400 IU

2) check your calcium supplement if it has D added, typically 100 IU

3) best food choices currently include milk, 100 IU per cup or yogurt (check the label), 80 IU per container, fish such as salmon or catfish

4) take the remainder as a vitamin D3 supplement