Update: UV Treated Mushrooms for Vitamin D

This abstract shows that exposing one serving (84 g) of post-harvest, white button mushrooms to UVB rays for 5 minutes resulted in their having 86.9 µg (3,476 IU) vitamin D2, which is well above the recommended daily intake.

So if you see mushrooms in the store labeled as having 100% of the Daily Value or RDA for vitamin D, it’s probably true.

3 Responses to “Update: UV Treated Mushrooms for Vitamin D”

  1. Arild Says:

    Do you know it that vitamin D level will be the same after the mushrooms have been roasted or cooked?

  2. Jack Norris RD Says:

    According to this chart at BeyondVeg.com, vitamin D is not damaged by cooking.

  3. Jack Norris RD Says:


    After only 15 to 20 seconds of exposure, our mushrooms contain over 400 IU’s of vitamin D per 3 ounce serving.

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