Mushrooms contain a fungal sterol called ergosterol. When mushrooms (Agaricus, shiitake, oyster, etc) are exposed to UV light, they convert ergosterol (provitamin D2) to Vitamin D2.
Mushrooms contain a fungal sterol called ergosterol. When mushrooms (Agaricus, shiitake, oyster, etc) are exposed to UV light, they convert ergosterol (provitamin D2) to Vitamin D2.
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