Reishi is known as the "mushroom of immortality" and is widely considered the most important medicinal mushroom. It has a long history of use in Chinese herbalism, where it was believed to give longevity.
The primary benefits of reishi come from the beta-glucans it contains. These enhance the immune system by causing natural killer cells to clean up other cells that are defective. Reishi also promotes stem cell activity.
Roen's Reishi mushrooms are for making tea. They are the fruiting body of the mushroom, dried, which can cooked in hot water to extract the medicinal properties.