山莴苣素是一种带苦味的物质，呈白色结晶状固体，属于倍半萜内酯类。它发现在某一些品种的生菜当中，可提炼制造成山莴苣膏，具有镇痛和镇静特性。

它可以用作腺甘酸受体的受体素。

• 莴苣苦素

Lactucin is a bitter substance that forms a white crystalline solid and belongs to the group of sesquiterpene lactones. It is found in some varieties of lettuce and is an ingredient of lactucarium. It has been shown to have analgesic and sedative properties. It has also shown some antimalarial effects. It is also found in dandelion coffee.