Essiac Tea also known as Ojibwa Tea.
From Wikipedia: Researchers at Memorial Sloan-Kettering Cancer Center have written that Essiac continues to be a popular cancer therapy despite unsubstantiated claims of its effectiveness. burdock (Arctium lappa), sheep sorrel (Rumex acetosella), slippery elm bark (Ulmus rubra), and Indian rhubarb (Rheum officinale) or turkey rhubarb (Rheum palmatum).
These 4 herbs are all in our Original Essiac Formula while some formulations may also contain watercress, blessed thistle, red clover, and kelp. Which is included in our Essiac 8 formula. Both of our natural herbal formulas are certified organic.
According to Traditional Chinese Medicine essiac clears heat from the blood and to some degree, relieving blood stasis. Taken as directed this herbal formula is a very weak (meaning diluted) formula. The body readily accepts the formula under even such adverse conditions as chemotherapy. In terms of prevention, many people report that it increases their energy. (a function of Relieving stagnation)