Reishi mushroom, also known as the mushroom of immortality (some claim reishi can help with aging & skin care), is a purely medicinal mushroom. Along with its immune boosting properties, Reishi has been shown to assist with cancer patients, reduce fatigue & depression, while also helping with insomnia. It is important to note that there are warnings for combining Reishi extracts with certain medications (specifically blood pressure medications & diabetic medications).