You already have a thread with this topic. I think one is enough, no?
http://anabolicminds.com/forum/steroids/291231-20mg-gw-501516-a.html#post5704316
My reply in that thread
You won't lose fat on that, only improve endurance. More is not better with Cardarine. It's been studied in great detail and used then banned by WADA because of various reasons. One of which being it improves endurance in athletes.
It will do nothing for you unless you are an endurance athlete training for an event or dying of cancer in which case I would recommend something else better that was not shelved such as MK2866 and MK677 for muscular retention in a caloric deficit. If you are wondering why it was banned by WADA (World Anti Doping Agency) you should Google it for more details.
Also, I'm not one to usually say "Use the Search" on AM because I think it rude, you should do that with regard to GW 501516 as you will get quite a few logs, and articles written with resources about what it is and does. I cannot take the time to look and list them here.
You have a lot of questions which is good, but you want the answers handed to you without effort on your part which I find to be greatly lacking of maturity for someone on such a forum filled to the brim and rich with information just to be searched and read about from educated people.
I reiterate this reply by
The_Old_Guy