RAD 140, also known as Testolone, is a selective androgen receptor modulator (SARM) designed to mimic the effects of testosterone. It selectively targets muscle and bone cells, stimulating growth and strength, while minimizing impact on other organs. This selective action makes it more effective and safer than traditional steroids, as it doesn't cause the typical side effects associated with steroid use. RAD 140 has gained popularity in the fitness community for its ability to enhance muscle mass and overall physical performance without the adverse effects seen in anabolic steroids.