It’s often said that you should avoid eating the seeds of apples as they contain the poison cyanide. Apple seeds do indeed contain amygdalin, a chemical compound formed of sugar and cyanide. One gram of apple seeds contains around 0.6mg of cyanide, but the lethal dose of cyanide starts at over 50mg. This means you’d need to eat nearly 100 apple seeds in one sitting to start putting yourself at risk! Many other fruits and vegetables contain very small traces of cyanide, such as cherries (Prunus avium), potatoes, and almonds (Prunus amygdalus).

Source: Royal Botanic Gardens Kew