Mushrooms make their own vitamin D in sunlight

Mushrooms uniquely produce vitamin D when exposed to sunlight, unlike most plants. They contain ergosterol, which converts to vitamin D2 from the sun's UV rays, mirroring how human skin makes vitamin D3. Just 15 minutes of direct sun can boost a serving of mushrooms from nearly zero to over 400 IU, meeting daily needs for many adults. This simple method offers an accessible, vegan-friendly solution to widespread vitamin D deficiency, endorsed by health authorities like the USDA. It highlights nature's clever ways to provide essential nutrients.