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Essiac is a tea developed by the Ojibwa tribe of Canada and prepared from a mixture of four herbs; Arctium lappa, Rumex acetosella, Ulmus rubra and Rheum officinale. Each of these herbs have been found to possess antioxidant and anti-cancer properties. 
Essiac tea is prepared from a mixture of the following herbs:
- Arctium lappa
- Rumex acetosella
- Ulmus rubra
- Rheum officinale
The uses of Essiac tea are as follows:
- Cancer. Essiac tea possesses potent antioxidant and DNA-protective activity, which are properties common to anti-cancer agents. It is found to strengthen the immune system, improve appetite, relieve pain, and improve overall quality of life. 
The recommended dosages have not yet been established. To determine what your specific requirements are talk to your naturopathic doctor or other trained medical professional.
Essiac tea is generally considered safe.
- Leonard SS, Keil D, Mehlman T, Proper S, Shi X, Harris GK (2006) Essiac tea: Scavenging of reactive oxygen species and effects on DNA damage. Journal of Ethnopharmacology;103(2): 288-296.
- Kaegi E (1998) Unconventional therapies for cancer: 1. Essiac. Canadian Medical Association Journal;158:897-902.