It is a potent Selective Androgen Receptor Modulator (SARM) originally discovered by Ligand Pharmaceuticals and later licensed to Viking Therapeutics. It has been studied for its ability to increase lean muscle mass and strength, showing strong anabolic effects even at very low doses in short-term human trials.

Benefits (from the passage)
Significant increases in lean body mass in a dose-dependent manner
Improved strength and physical performance, including stair-climbing speed and power
Demonstrated safety and tolerability in short-term human studies
Effective at very low doses in clinical research (0.1–1 mg)
Strong muscle-building potential, even in experienced or plateaued users (anecdotal)
Notable results in both men and women, with females reportedly achieving gains at low doses
Potential for lasting muscle gains, according to anecdotal observations