about 500 different species turkey tails featured here or when the best described and studied medicinal mushrooms in the world we received a 2.2 million dollar breast cancer clinical grant from the nih for phase one breast cancer and the results of the studies have been published and on a dose-dependent basis well prior to radiation your immune system is as active and then when the turkey tail mushrooms eight capsules per day are consumed there is an upregulation of natural killer cells and then post radiation most of you know the immune