Cyanide is a toxic substance commonly found in many plants and industrial facilities. It is a form of toxic hydrogen cyanide (HCN). It is found in many plants such as cassava, sugar cane, apple, taro, almonds, cherries, peaches, mango, papaya, guava, lemon and rice such as, wheat, barley, oats, rice, rye, sorghum, corn, beans, etc.
These plants contain substances amygdalin (The precursors of the Laetrile or Vitamin B17), which is different depending on the type of plant (Compounds were isolated as Laetrile or substances that be impersonating as B17) such as cassava were found 80-90 of the linamarin and lotaustralin, the remainder in the form hydrogen-cyanide.
Cyanide (toxic form of Laetrile, or vitamin B17) is a toxic.
While in apple found in the form of amygdalin and prunasin etc. These plants contain enzymes capable of degrading these cyanogenic glycosides into hydrogen-cyanide (toxic form of Amygdalin, Laetrile, or B17), which it is toxic.