Cardarine, also known as GW501516, does not directly act on androgen receptors like SARMs because it is actually what’s called a PPAR-delta activator, or Peroxisome Proliferator-Activated Receptor-delta. Because of its special abilities, GW501516 is beloved by millions, especially those in the bodybuilding community. Typically, it is used to burn excessive fat, decrease recovery times after workouts, and increase bodily endurance in a short amount of time.