Androstadienone, also known as AND, is a chemical compound that is naturally produced in the human body. It is commonly known as a pheromone, which is a chemical substance that is released by one individual and affects the behavior of another individual of the same species. Although there are no direct synonyms for androstadienone, it is sometimes referred to as a male pheromone, as it is more commonly found in men than in women. It is also sometimes called an attraction pheromone, as it is believed to have an effect on the perception of attractiveness and sexual attraction. Other related terms include sex pheromones, odorants, and chemical messengers.