Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Mushrooms contain large amounts of vitamin D2 when exposed to UV light. Mushrooms are the only known crop that naturally contains vitamin D. Mushrooms when exposed to UV light, convert ergosterol, a chemical found in large concentrations in many mushrooms, to vitamin D2. This is similar to the reaction in humans, where Vitamin D3 is synthesized after exposure to UV light. 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. Using high performance liquid chromatography analysis, author Paul Stamets was able to demonstrate the effect sunlight has on mushroom vitamin D2 content.

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