By: Text: Katherine Brooking, MS, RD
If you think mushrooms add flavor, but no real nutrition, here's some intriguing news: Mushrooms are the only vegetable source of vitamin D, a nutrient many people are short on these days. It's a small amount―just 15 international units―but preliminary research suggests sunlight may give it a boost. One study found that exposure to five minutes of ultraviolet light may boost Vitamin D levels in a serving (4 to 5 white button mushrooms) from 4 percent of the Daily Value to as much as 100 percent (400 IU). In addition, many popular mushroom varieties like white, portabella, and crimini are good sources of B vitamins like riboflavin and niacin.