*Essiac tea is much less effective for people who have received conventional cancer treatment already or are doing so at the same time. Essiac enables the host's immune system to fight the cancer, but this only works if the immune system is not already damaged.<ref name="Essiac Essentials">Snow, Sheila, and Mali Klein. Essiac Essentials: The Remarkable Herbal Cancer Fighter. New York: Kensington, 1999. Print.</ref> | *Essiac tea is much less effective for people who have received conventional cancer treatment already or are doing so at the same time. Essiac enables the host's immune system to fight the cancer, but this only works if the immune system is not already damaged.<ref name="Essiac Essentials">Snow, Sheila, and Mali Klein. Essiac Essentials: The Remarkable Herbal Cancer Fighter. New York: Kensington, 1999. Print.</ref> |