Shiitake and maitake mushrooms naturally contain vitamin D. UV radiation boosts vitamin D2 production.
Mushroom
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Vitamin D is added to milk, plant-based milk replacements, orange juice, and cereals. Look for fortified options on nutrition labels.
Fortified Food
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One of the highest vitamin D sources is cod liver oil, at 450 IU per teaspoon (4.5 grams). Due to its vitamin A level, cod liver oil should be consumed moderately.