Since your posting is now 4 yeas old; I hope you chose the B17. Many wild mamals are protected from cancer beause they eat grasses that have the natural product that we call B17. Canines and bears will eat Johson grass several times a year to get the B17, Salmon berries of northern lattitudes has it. using Laetrile and a capsule of cayenne pepper and do not forget the 4,000 IU of vitamin C That is an excellent combination --Most of the mammals produce 4000 iu of vitamin C internally daily. In addition to being a healthy vitamin it is a natural blood thinner.