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Mushrooms are said to need UV exposure for meaningful vitamin D
A commenter says mushrooms provide D2, which raises blood vitamin D levels less than D3.
TLDR
A commenter says mushrooms produce meaningful vitamin D only after UV exposure. They say the D2 in mushrooms raises blood vitamin D levels less than D3, and point to fatty fish, egg yolks, fortified foods and sensible midday sun as usually more reliable sources.
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