Mushrooms and Sunlight 03.31.08 Search

Five minutes of sunlight on mushrooms yields four times the new daily requirement of Vitamin D



The FDA has raised the daily adult requirement for Vitamin D to 1000 IUD. Source

It has recently been noted that mushrooms contain a large amount of vitamin D when exposed to UV light.[1][2][3] The reason is due to the fact UV light converts ergosterol, a chemical found in large concentrations in many mushrooms, to vitamin D2. Using high performance liquid chromatography analysis, author Paul Stamets was able to demonstrate the effect sunlight has on mushroom vitamin D content.[4]

Testing conducted by Pennsylvania State University, showed that an hour of UV light exposure made a serving of mushrooms contain twice the FDA's daily recommendation of vitamin D. Testing by the Monterey Mushrooms company, demonstrated 5 minutes of UV light exposure made a serving of mushrooms contain four times the FDA's daily recommendation of vitamin D.[5]

Mushroom Drying conditions Vitamin D content (IU/100g)
Shiitake Without sunlight 10-100
Shiitake In sunlight, gills down 11,000
Shiitake In sunlight, gills up 46,000
Reishi No sunlight 66
Reishi In sunlight, gills up 2,760
Maitake No sunlight 460
Maitake In sunlight, gills up 31,900
Diagram showing conversion of ergosterol to vitamin D2.

See also

Fungi portal

Hypervitaminosis D

Common mushroom

Medicinal mushrooms

Paul Stamets

Vitamin D


  1. ^
  2. ^ Koyyalamudi SR, Jeong SC, Song CH, Cho KY, Pang G (April 2009). "Vitamin D2 formation and bioavailability from Agaricus bisporus button mushrooms treated with ultraviolet irradiation". J. Agric. Food Chem. 57 (8): 33515. doi:10.1021/jf803908q. PMID 19281276. 
  3. ^ Lee GS, Byun HS, Yoon KH, Lee JS, Choi KC, Jeung EB (March 2009). "Dietary calcium and vitamin D2 supplementation with enhanced Lentinula edodes improves osteoporosis-like symptoms and induces duodenal and renal active calcium transport gene expression in mice". Eur J Nutr 48 (2): 7583. doi:10.1007/s00394-008-0763-2. PMID 19093162. 
  4. ^ Paul Stamets (2005). Mycelium Running. Berkeley, California: Ten Speed Press. p. 203. ISBN 9781580085793. OCLC 262557556. 
  5. ^
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