Firstly we need to understand that our bodies use several enzymes to perform many tasks. Our body has one particular enzyme called Rhodanese which is found in large quantities throughout the body but is not present where ever there are cancer cells. Yet, where ever you find cancer in the body, you find another enzyme called Beta-Glucosidase. So, we have the enzyme Rhodanese found everywhere in the body except at the cancer cells, and we have the enzyme Beta-Glucosidase found in very large quantities only at the cancer cell but not found anywhere else in the body. If there is no cancer in the body there is no enzyme Beta-Glucosidase.
Now the following is what scares most people. You see, Vitamin B17 is made up of 2 parts glucose, 1 part Hydrogen Cyanide and 1 part Benzaldehyde(analgesic/painkiller). So its very important you understand the following:
When B17 is introduced to the body, it is broken down by the enzyme Rhodanese. The Rhodanese breaks the Hydrogen Cyanide and Benzaldehyde down into 2 by-products, Thiocyanate and Benzoic acid which are beneficial in nourishing healthy cells and forms the metabolic pool production for vitamin B12. Any excess of these by-products is expelled in normal fashion from the body via urine. Vitamin B17 passes through your body and does not last longer than 80 minutes inside your body as a result of the Rhodanese breaking it down. (Hydrogen Cyanide has been proven to be chemically inert and non toxic when taken as food or refined pharmaceutical such as laetrile. Sugar has be shown to be 20 times more toxic than B17
HERE IS THE GOOD PART - When the B17 comes into contact with cancer cells, there is no Rhodanese to break it down and neutrelise it but instead, only the enzyme Beta-Gucosidase is present in very large quantities. When B17 and Beta-Glucosidase come into contact with each other, a chemical reaction occurs and the Hydrogen Cyanide and Benzaldehyde combine synergistically to produce a poison which destroys and kills the cancer cells. This whole process is known as selective toxicity. Only the cancer cells are specifically targeted and destroyed. See the diagram below.
That is how Vitamin B17 Kills Cancer. It has been proven and illustrated to work by the some of the top specialists in the world. Thats why the Contreras hospital in Mexico have been able over the LAST 30 YEARS to successfully treat over 100,000 cancer patients!!!
The use of Amygdalin ( Laetrile/Vitamin B17 ) in the treatment of human cancer dates back at least to 1843, although the ancient Chinese are reported to have used bitter almonds containing significant quantities of it in the treatment of tumors some 3,000 years ago.
( Laetrile or Amygdalin ) Vitamin B17 was the name given to the purified form of Amygdalin by a Bio Chemist named Ernst T Krebs in 1952. He also called it Laetrile which is simply short for Lavo-mandelonitrile and was awarded its vitamin status officially in 1952 after advice from Dr Dean Burke who was the co-founder of the National Cancer Institute. Amygdalin on the other hand is said to have been first discovered and used by a German chemist Leibig as far back as 1830. So, laetrile/Vitamin B17 on the other hand is simply a more soluble and concentrated form of amygdalin which allows it to be administered in a much greater concentration.
Either way all 3 are essentially the same thing.
Vitamin B17 / Laetrile is probably one of the most controversial medical topics in the last 30 years. You may remember back in the 50's - mid 70's there was a lot hype in the medical world regarding a new natural cancer treatment that was discovered that killed cancer cells. This was the result of Dr Ernst Krebs findings and his research in a book called World Without Cancer. Well after several years of court cases and controversy regarding Laetrile it was finally stamped out by the FDA and reported to the mass media in the US as a fraud and failure. They called it Quackery in those days.
How the FDA lied and falsified tests about laetrile
How the people that did the original testing have come forth and given evidence of their positive findings
How the FDA commissioned their top cancer specialist doctor in US to do a 5 year study to prove laetrile does not work. The results of the tests proved that laetrile did kill cancer so they tried to cover it up. 
The same doctors that originally claimed laetrile did not work and stamped it out in the 50's have become infamous for defending smoking as not related to lung cancer, but more importantly, the infamous quote by Dr MacDonald "a pack a day keeps lung cancer away" - click here for info - Not surprisingly it was later found that they were paid off by the tobacco companies to report smoking as not related to lung cancer.
There are several races of people in the world today that have never had 1 single reported case of cancer amongst their nation because of a high B17 diet. 
