News|Articles|June 17, 2026

Vitamin D in Mushrooms

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Key Takeaways

Ultraviolet exposure drives conversion of mushroom ergosterol into vitamin D, most commonly ergocalciferol (vitamin D2), through a photochemical process.
Sunlight and controlled UV lamps can be used to increase vitamin D levels in mushrooms, implying that processing conditions meaningfully influence nutrient composition.
Vitamin D content is not fixed across mushroom products, so labeling, sourcing, and handling practices may affect the reliability of dietary vitamin D intake.

Fun Fact! When exposed to sunlight or UV-light, mushrooms can produce vitamin D.

Fun Fact! Like humans, when exposed to sunlight, mushrooms can produce vitamin D. Ergosterol, the mushrooms’ plant sterol, converts to vitamin D when exposed to sunlight or a sunlamp.

Source: American Mushroom Institute. Mushroom Facts. Accessed June 17, 2026. https://www.americanmushroom.org/main/mushroom-facts/

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Vitamin D in Mushrooms

Key Takeaways

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