Testolone (RAD 140) stimulates androgen receptors in the bones and muscles with greater affinity than in the reproductive organs. Studies have shown that RAD 140 can increase muscle mass, decrease fat, and improve cardiovascular performance. RAD 140 is best used for bulking and for body recomp. RAD 140 is quite well-rounded in that it offers benefits that match all goals (muscle gain, fat loss, endurance & body recomp). Recommended for beginners.