I'm 5 ft 8 in tall and I weigh around 212 lb
 body fat is somewhere in the 20s
 I'm a bigger guy but I also have muscle
 I'm looking for something that I can take to help with muscle mass gains without losing my endurance
 my friend said that S4 andarine is way better than lgd 4033 and his experience 
 do you think I should do it at  75 mg a day for 12 weeks end stack something else? Or should I go ahead and order lgd 4033 just to be safe