Eat more fish
Along with a supplement, try to fill your diet with D-packed foods, like fish. Three ounces of cooked sockeye salmon offers 447 IUs of bone-friendly vitamin D, according to the National Institutes of Health’s Office of Dietary Supplements.
Two canned sardines contain 46 IUs. And three ounces of canned tuna has 154 IUs. Eat them on the regular and you’ll be well on your way to your daily quota.