Test-E, or testosterone enanthate, is a type of anabolic steroid that is often used to treat low testosterone levels in men. It is controlled by infusion and works by expanding testosterone levels in the body, which can prompt expanded bulk, strength, and drive. 
Test-E is also sometimes used illegally by athletes and bodybuilders to enhance performance and improve physical appearance. However, it can have a number of side effects, including acne, hair loss, mood changes, and liver damage. It should only be used under the guidance of a healthcare professional.