There isn't a whole lot of benefit with MK-677 to be worth running IMO. It is supposed to raise GH output but there are better options out there with peptides
MK-2866 (Ostarine) is great for adding muscle mass and dropping body fat. It is also minimally suppressive and no known side effects.
There are a ton of threads around about Ostarine. Check out www.sarms1.com for the best source for sarms and Ostarine