I have also been warned by my homeopath about the possible connection between sour sop and parkinsons'. I do still use the bark and leaf in tea, along with guinea hen root and meringay leaf, but have cut back the amount and frequency. I too, chose to use these 'remedies' after a full course of chemo and radiation at one of Cananda's best cancer hospitals, blessedly in the hands of a top notch oncologist. Fingers crossed folks, the only guarantee in life is that anything can happen at anytime.