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also Laetril or Vitamin B17

One of the ineffective pseudoscientific methods of alternative cancer treatment .

Amygdalin is a simple molecule - a cyanogenic glycoside consisting of two sugar residues and a small phenyl aglycon - occurring in bitter almonds, peach or apricot seeds. Amygdalin has a single function in plants: To be a source of poisonous cyanide, thus discouraging animals from eating seeds. In the second half of the 20th century, the idea was that hydrogen cyanide from amygdaline could be used to selectively kill cancer cells because they have a slightly higher metabolism than normal cells, and thus they are more susceptible to cyanide. This idea is totally destitute, but the modified amygdalin has even been promoted under the names of laetril and vitamin B17 to treat cancer.

In order to understand why amygdalin can not function against cancer , we must realize that our cells have two ways of obtaining energy: anaerobic (without oxygen) and aerobic (internal breathing). Hydrogen cyanide blocks internal breathing, but the cell still has energy and anaerobic digestion of sugar. If we blocked the inward breathing of only a small number of body cells, these would easily survive through the supply of anaerobic energy from the rest of the body. Cyanide therefore has the ability to selectively kill only some cells at all - it kills the whole organism by the total exhaustion of energy. Hydrogen cyanide is therefore completely ineffective against cancer cells.

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