Laetrile B17 is a supplement derived from apricot pits and other natural sources. The chemical name for this compound is amygdalin, laetrile, or nitriloside. Extracted from the seeds of certain fruits and tree nuts, Amygdalin is found in more than 1,200 different foods such as apple seeds, bitter almonds, cashews, and plums. Laetrile B17 can be used as a supplement and is beneficial to overall health.