GW- 501516 is a peroxisome proliferator-activated receptor (PPAR) that it totally destroyed fat cells while enhancing muscle cell growth, increased metabolism and its the ultimate workout enhancer.
MK-2866 (Osterine) also known as Enobosarm is an investigational selective androgen receptor modulator (SARM) primarily developed for the treatment of conditions such as muscle wasting and osteoporosis
SR-9009 (Stenabolic) is not a true Selective Androgen receptor Modulator. It is a Rev-ErbA ligand. As such, it binds to this protein and makes it more active.