Mushroom 1 | Mushroom supply | Biobritte mushroom shop Mushroom 1 Mushrooms exposed to ultraviolet (UV) light produce vitamin D2 before or after harvest by converting ergosterol, a chemical found in large concentrations in mushrooms, to vitamin D2. This is similar to the reaction in humans, where vitamin D3 is synthesized after exposure to sunlight. Testing showed an hour of UV light exposure before harvesting made a serving of mushrooms contain twice the U.S. Food and Drug Administration's daily recommendation of vitamin D, and 5 minutes of artificial UV light exposure after harvesting made a serving of mushrooms contain four times the FDA's daily recommendation of vitamin D. The analysis also demonstrated that natural sunlight produced vitamin D2. The ergocalciferol, vitamin D2, in UV-irradiated mushrooms is not the same form of vitamin D as is produced by UV-irradiation of human or animal skin, fur, or feathers (cholecalciferol, vitamin D3). Although vitamin D2 clearly ha
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