Indian Rhubarb contains a chemical compound, which has been shown to both help and block tumors in the laboratory. Slippery elm contains many fatty acids and fatty acid esters which have been shown to stop tumor cell growth in mice. Very little is known about sheep sorrel. The contents of the package makes 3 quarts of tea. There are minimal side effects if Essiac is taken as directed.
Manufacturers suggest taking the tea on an empty stomach to minimize possible side effects.
Side effects include nausea, vomiting, and diarrhea. The herbs in Essiac may cause allergic dermatitis if there is contact with the skin. Dermatitis is irritation of the skin. Rhubarb should not be given to children under the age of 12. One should discuss the use of Rhubarb and Essiac with a physician before use during pregnancy or while nursing.