Shiitake mushrooms have long been recognized as a very good, non-animal food source of iron. But a recent preliminary study has determined that the bioavailability of iron from shiitake mushrooms may be even better than we thought. Although conducted on laboratory animals (female rats) rather than humans, this study found the iron in dried shiitake mushroom to be equally as bioavailable as supplemental iron in the form of ferrous gluconate. (Ferrous gluconate is a very commonly used low-dose iron supplement.) While we don't usually spotlight research on laboratory animals, we found this result to be especially promising for individuals who consume little or no animal products and are often looking for foods that can supply valuable amounts of bioavailable iron.

Shiitake
 

Shiitake, maitake, and reishi mushrooms are widely referred to as "medicinal mushrooms" due to their long history of medical use, particularly in oriental medicine traditions. It's important to distinguish, however, between extracts and medicinal preparations made from these mushrooms and their appearance as whole foods in an everyday diet. Most of the medicinal research on shiitake mushrooms has been conducted on laboratory animals or on individual cells studied in a laboratory setting. There are hundreds of lab and animal studies that clearly document the medicinal properties of shiitake extract. As important as these studies are in a medical context, they are still very different from studies that examine shiitake mushroom as a common and beloved food.

In contrast to the wealth of medicinal research on shiitake mushrooms, there are very few studies on shiitake mushrooms in the human diet. Among the human dietary studies that do exist, however, there is a clear message about shiitake mushrooms: they can provide us with some fantastic health benefits. Below are areas of health support that make the top of our list for shiitake mushrooms when enjoyed as a whole food.

No health benefit is better documented for shiitake mushroom than immune support. In fact, the immune support track record for this mushroom is fascinating. On the one hand, numerous studies have shown the ability of whole shiitake mushrooms to help prevent excessive immune system activity.
 

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