About Ostarine read this:
http://forums.steroid.com/sarms-sele...ml#post7180243
GW-501516 is useless for muscle building, and personally I would say for anything.
MK-677 is long acting ghrelin, which has been around since 90's, and never made it into the medical community. Long acting GHrelin block normal pulsatile GH waves, GH basically "drips" at constant rate. This pattern is not normal in male humans, and can produce neurological problems due to the chronic stress of constant release of GH, i.e. panic attacks, depression, unfounded fears.
Bottom line, ostarine is as bad as using steroids with added bad side effects. MK-677 the objective is to raise your GH, which at your age are at peak production, messing it up might not return to what was before, adding an array of side effects.