Androstadienone, also known as androsta-4,16,-dien-3-one, is a chemical compound that has been described as having strong pheromone-like activities in humans.[1] It is derivative of the sex hormonetestosterone: however, androstadienone does not exhibit any known androgenic or anabolic effects. Though it has been reported to significantly affect the mood of women, it does not alter behaviour. [2] Androstadienone has a strong odor of sweat and is commonly sold in male fragrances, purportedly to increase sexual attraction.