Fortified cereal
It’s time to give Raisin Bran another chance. Not only is it a great source of whole grains and fiber, but one cup contains 60 IU or 15% of your DV, per the USDA.
Sardines
Before you scoff at sardines, hold up. These sustainable fish are low in mercury and high in healthy omega-3 fatty acids, not to mention vitamin D. Add them to an antipasto platter, use them as a crostini topper, or toss ’em into a salad for a whopping 193 IUs per can, or 20% of your DV, according to the USDA.