Apricot kernels are a commonly grown fruit on Tenerife and in many other parts of the world and most people throw the stones away not realizing that inside each one is a kernel, which is the best source of Vitamin B17 that is believed to be a good protection against cancer.Vitamin B17 was the subject of great controversy many years ago when it was claimed in 1950 by Dr. Ernst Krebs Jr, that when consumed on a regular basis, this natural substance prevents the body getting cancer, and that it will also fight against existing cases of the disease. Vitamin B17, which also know as laetrile and amygdalin, is found in many fruit pips and stones such as those of the apple, peach, nectarine, cherry and grape. It is also found in some beans and many cereal grasses such as wheat, but apricot kernels are the best source.