Boldenone Undecylenate, often referred to as EQ (Equipoise), is an anabolic steroid commonly used in veterinary medicine to improve the appetite and muscle mass of animals. It is derived from testosterone, with a long undecylenate ester that extends its half-life in the body. In bodybuilding and athletic circles, it is used to enhance muscle growth, strength, and endurance. Unlike other steroids, Boldenone Undecylenate has a lower risk of estrogenic side effects but can still cause significant hormonal changes. Its use should be approached cautiously and under medical supervision to minimize potential side effects.