Essiac tea-

touted as an anticancer tea, an anti-inflammatory drug, and immune boosting drug, this tea is a mixture of four different herbal medicines: burdock root, sheep sorrel herb, slippery elm bark, and Turkey or Indian rhubarb root.  The name Essiac is the name of the nurse spelled backwards (Caisse) who was given the formula in the 1920s by a patient and claimed it was an ancient Indian (American) tea.  She used it to treat cancer in Canada, then the drug was submitted to the FDA in the US for approval and was rejected.  Canada rejected the drug, and the nurse continued to make the tea anyway and give it away.  There are almost no scientific studies proving efficacy of the tea.