Apricot Kernal Seeds are the highest & best source for B-17. The original fellow that discovered it, basically he said that cancer is the result of a B-17 deficiency in the diet. Since the 1930's the US farmers have been fertilizing with petrolium by-product based fertilizers. It is my belief this is the reason for the rise of cancer in the US since 1930's. The soils have all been depleted of the natural sources of trace minerals. We need trace minerals for a healthy immune system.I myself wish I had the information about B-17 and for Killing cancer about 16-19 months ago when my mom got diagnosed w/terminal cancer. There is going to be a "healing crisis" that happens once the tumor is affected, and killed. The body must remove it, and symptoms may get rather nasty fort a few days. But, this is a good sign! drink lotsa water with pure juice of lemon, and stir in cranberry concentrate every day to clean out all the nasty stuff. Hope this helps. B-17 is the most promising thing to use to kill cancer, I am sure. rv. .......................................................