RAD-140, also known as Testolone, is a nonsteroidal selective androgen receptor modulator (SARM). Like other SARMs, it is being studied for its potential to bind to specific androgen receptors, so it does not cause the full range of androgenic effects that similar substances such as anabolic steroids, DHT, or testosterone replacement therapy do. Testosterone didn’t come around for long. In fact, this research compound was developed in 2010 as a potential treatment for osteoporosis. As of this writing, it is being studied primarily as a research compound for its potential ability to enhance muscle hypertrophy and promote muscle growth.