Apples are one such fruit: their pips (seeds) contain amygdalin, [Cherry, peach, and apricot pits also contain amygdalin] a cyanide and sugar compound that degrades into hydrogen cyanide (HCN) when metabolized.

Cyanide itself is a poison that kills by denying blood the ability to carry oxygen and thereby causes its victims to die of asphyxiation. At least within the realm of murder mysteries, cyanide is the darling of poisoners because it acts quickly and irrevocably: once a fatal dose has been ingested, there is no effective antidote, and death takes place within minutes.

This message is not to panic but aware you. Thank fully the amount of cyanide in these seeds are very less that our immune system nullify it.