A 3.5-ounce serving can provide around 570 IU of vitamin D.
Just one tablespoon contains about 1,360 IU of vitamin D, making it one of the richest sources.
Certain varieties, like shiitake and maitake, can offer up to 1,000 IU per serving when exposed to UV light.
A cup of fortified cow’s milk typically provides around 120 IU of vitamin D.
Almond, soy, or oat milk can also be fortified with about 100 IU per cup.
Some cereals can contain up to 100 IU or more per serving.
A 3.5-ounce serving can provide around 49 IU, but it's also rich in other nutrients.
Although not significantly higher, egg yolks contain about 37 IU each, and combining with other foods can enhance intake.