Boldenone Undecylenate is primarily used in veterinary medicine to promote muscle growth and improve appetite in animals, particularly horses. It is often administered to underweight or debilitated animals to enhance their physical condition and overall health. In some cases, it is also used to support recovery in animals after illness or surgery. Outside of veterinary use, it has been misused in human sports and bodybuilding as a performance-enhancing drug to increase muscle mass and strength, though this is illegal and poses significant health risks. Its anabolic properties make it effective for increasing protein synthesis and nitrogen retention in muscle tissues.