Analysis of information sources in references of the Wikipedia article "Essiac" in English language version.
There have been no published clinical trials in conventional medical journals showing that either Essiac tea or Flor Essence helps in the treatment of cancer ... most laboratory studies of Essiac have found it didn't work against cancer cells, and one reported that Flor Essence increased the growth of breast cancer cells. Available scientific evidence does not support its use for the treatment of cancer in humans. ... Serious side effects are uncommon. Essiac may cause headache, nausea, diarrhea or constipation, vomiting, low blood sugar, liver damage, and kidney damage. Allergic rashes are possible. Rarely, serious allergic reactions have been reported."
