Metabolic therapy elements are utilized in order to provide our human organism the best environment to combat disease and regain health.A homage to Dr. Contreras

The terms Laetrile and Amygdalin refer to the same compound – vitamin B-17 – and are interchangeable.

Laetrile Kills Cancer Cells

The pit of apricots, peaches, nectarines and plums contains a kernel rich in a substance called amygdalin. Amygdalin was first discovered in 1802 by the chemist Bohn during the distillation of the water of bitter almonds. Later the anti-tumor properties were studied by Dr. Ernesto Contreras of the Oasis of Hope hospital in Mexico and many other physicians around the world. They showed that amygdalin releases hydrogen cyanide, a toxic chemical that kills cancer cells, sparing normal cells. The mechanism of action has been described by Dr. Contreras: Cancer cells and only cancer cells, contain an enzyme called glucosidase. This enzyme facilitates the chemical reaction, which transforms laetrile into a hydrogen cyanide toxic to cancer cells. Normal cells do not contain this enzyme and therefore cyanide cannot be formed in normal cells. The use of laetrile requires the use of enzymes to break the pericellular coating of cancer cells. The therapy requires eating apricot kernels at the same time.

Laetrile Decreases Bone Cancer Pain

Laetrile is particularly useful in cancer metastasis or primary bone cancer to manage bone pain. Opioids are the most commonly used pharmaceutical medicine for pain management. However, opioids have common side effects including sedation, dizziness, nausea, vomiting, constipation, physical dependence, tolerance and respiratory depression. When possible it is useful to administer laetrile in place or in conjunction with lower doses of opiates.


Laetrile is administered orally and intravenously.

Oral Administration

Oral administration of Vitamin B-17 is the most convenient and frequently used method in the US. The B-17 ingredient is derived from the kernels of apricots and is available in 100 mg or 500 mg tablets. It should be taken in conjunction with apricot seeds.

Dr. Contreras recommends:

  • 2-4 100 mg tablets as a nutritional supplement for prevention.
  • 4-6 500 mg tablets per day as a nutritional supplement for clinical cancer sufferers, taken in conjunction with enzymes, antioxidants, and other supplements.

Dr. Krebs says “For some patients in whom gastric acidity is deficient, side reactions of weakness or headache following oral administration may be avoided by taking citrus juices or grape juice, or hydrochloric acid tablets such as betaine hydrochloride to prevent these unpleasant reactions”.

Intravenous Injection

Dr. Contreras protocol includes Laetrile injected intravenously for the first 21 days followed by oral administration for the next 3 months. DMSO is usually added to the infusion for a better penetration of the tissues. In addition to the intravenous administration of B-17, high doses of pancreatic enzymes, vitamin C, E, A and shark cartilage are taken orally to help break down the cell membrane of the cancer cell.

Read more about Vitamin B17 on World Without Cancer website