Regarded by ancient herbalists as the ‘mushroom of immortality,’ reishi is traditionally used in Chinese medicine to support healthy immune system function and promote a healthy stress response. A famous Shen tonic, reishi is recommended to calm and balance the spirit, and to enhance sleep quality. It strengthens the Heart, Kidneys, Lungs, and Liver - it is one of those special herbs that work on all Three Treasures (Jing, Qi, and Shen), as well as all the five Daoist organ systems.