This product can be used often and can support the soft epithelial layer tissues. Some of the key herbs include Kudzu (Fen Ke) Root, Baikal Skullcap Root, Eucalyptus Leaf, Andrographis Leaf, Astragalus Root, Balloon Flower Root, and Chaga Mushroom. Chaga Mushroom on birch trees are known to offer very strong immune support and is very rare.