Boldenone (commonly known as Equipoise or EQ) is a long-acting injectable anabolic-androgenic steroid (AAS) derived from testosterone with a double bond between carbons 1 and 2, featuring an undecylenate ester for a slow release and half-life of about 14 days, allowing weekly injections. Originally developed for veterinary use to promote lean muscle growth and appetite in horses, it has limited human medical applications, sometimes used off-label for anemia due to red blood cell stimulation. In bodybuilding, Boldenone is favored in bulking or lean mass cycles for steady, quality muscle gains, increased vascularity, enhanced endurance via elevated RBC count, and moderate strength improvements with low estrogenic activity and minimal water retention.