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- ✍️DraftedSunday, September 20, 2026 at 3:14 PM
- ✓Approved by clientFriday, September 25, 2026 at 2:19 AM
- 📡Published to platformTuesday, September 29, 2026 at 7:04 PM
R4 · The mushroom that made its own vitamin D
Save this for your next grocery run. Mushrooms carry a compound in their cell walls that turns into vitamin D when ultraviolet light hits it. Same kind of reaction that happens in your skin in summer, just running on a fungal version of the raw material. Which means the number on the package depends entirely on whether that mushroom ever met any light. Grown in the dark, the ordinary way: a cup of sliced white mushrooms gives you roughly 1% of a day's vitamin D. Genuinely almost nothing. The same mushroom after a few seconds under UV lamps: about 18 mcg a cup. That is more than a full day in one handful. How to spot them: the package says UV-exposed, sunshine, or prints a vitamin D figure on the front. If it says nothing at all, assume dark-grown. And the amount varies a lot between growers, so the label is worth reading rather than guessing. One honest note. The form mushrooms make is D2, and D3 has a slight edge overall. When people take it daily rather than in big occasional doses, that gap mostly closes. Nobody treats them as identical, and nobody should tell you D2 does nothing either.
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