In contrast with most plant foods, which need UV irradiation in order for a compound, which functions as a precursor to ...

and raw maitake mushrooms and portobellos exposed to UV light are among the highest in vitamin D. White mushrooms are also sold with enhanced levels of vitamin D. Ultimately, though, any mushroom ...

Exposing fresh, undamaged mushrooms to UV light or sunlight can significantly increase their vitamin D content. Consuming these mushrooms within 24-48 hours after exposure ensures maximum benefit.