Hop (Humulus lupulus L.) is a plant very well spread in temperate areas. Preparations from inflorescences, containing several bioactive molecules (most of which are bitter α and β acids, like humulone and lupulone) possess several activities such as a relaxing and hypnotic effect. Hop extracts standardized in 8-prenylnaringenin are also used to mitigate post menopausal syndromes, mimicking endogenous hormones.