MK2866 or Ostarine, is in class of drugs called SARMs, or Selective Androgen Receptor Modulators. MK2866 is selective and only binds to bone and muscle androgen receptors.
This action prevents things like prostate issues or hair loss or any of the other nasty side effects anabolic steroids can result in. Ostarine is not suppressive to the HPTA in a short 4 week cycle of 25mg a day, but can become suppressive, to a small degree, if use is continued too long or higher doses are used.
MK2866 does not aromatize into estrogen. In addition, Ostarine is not hepatoxic, it doesn’t hurt your liver when you use it. Thus, it allows for longer possible cycle durations than the typical oral steroid cycle.
MK2866 is anti-catabolic and shines in this department. This means that even in low calorie environments you can keep your muscle instead of it wasting away. In addition, if you just came off an anabolic steroid cycle, Ostarine would be a great addition to your PCT as it will prevent muscle waste.