ESSIAC is a world renowned herbal formula developed by Rene M. Caisse, a Canadian nurse. Since 1922, Nurse Caisse used her original herbal formula to help support the immune system. This tea is a Native Herbal Cancer Remedy. Essiac Tea has helped thousands of people for hundreds of years cure and reduce the spread of cancer within their bodies. The herbs in this tea are Burdock Root, Sheep Sorrel, Turkish Rhubarb, & Slippery Elm, they are all natural and all organic herbs to help heal the body, build and support a healthy immune system.