there are MANY sites about various cancers and grape seed extract and pycnogenol. 17 yrs ago we were told Pycnogenol MAY prevent cancer and that was the MAIN reason I started on this antioxidant....now take Grape Seed Ex for some 16 yrs.... I've read that quite a few research hospitals are using Grape Seed Ex in their cancer research....Mayo, City of Hope and others. So, I'm hoping that this antioxidant will keep me cancer free. It's done SO MUCH so far, no allergies/sinus issues, no headaches, better eyesight, healthy gums, more energy....vitality and the lists goes on and on.