Proviron, known by the generic name “Mesterolone,” is an oral anabolic androgenic steroid (AAS). It’s primarily used in the treatment of male hypogonadism and certain types of sexual dysfunctions. Unlike some other anabolic steroids, Proviron is not used to promote large gains in muscle mass but rather is used primarily for its anti-estrogenic effects and for its ability to help maintain free testosterone levels in the body. Proviron works by supplementing the body’s natural testosterone levels, while its anti-estrogenic properties help reduce the effects of estrogen in the body. It has a high affinity to bind with sex hormone-binding globulin (SHBG), thereby increasing the fraction of free testosterone in the blood.