Geranium is a hardy plant which has long been used in perfume-making for its essential oil. Geranium leaves have many stomas, which resemble channels where gas exchanges with the atmosphere take place. Itwas in the cells bordering these stomas that a substance equivalent to ANP (Atrial Natriuretic Peptide) was discovered, which is able to stimulate GMPc, a new and previously unknown trigger of lipolysis.