I read an article that explained due to the difference in metabolism, that the doses they were using were in fact comparable to what humans use.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4804402/
^here's an article explaining the math in understanding the dosing from humans to other species, although I am way too dumb to really grasp it. rest assured, it's not a simple mg to mg comparison, like some of the compaines selling GW would claim...
FWIW, I saw NO fat loss on GW, but did notice better cardio. quite frankly, I've been rather suspect of the fat loss claims, as those reviews are few and far between and seem to have some connection to the companies/reps.
I find the possibility of muscle fiber shift to be kind of a turn off, as well...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC509410/
FWIW, here's a good link with some studies on GW:
http://www.sciencedirect.com/topics/neuroscience/gw501516[/QUOT
Maybe it depends on the individual, I used Cardarine for the first time back in February of this year as part of my first "Triple Stack" run. Along with the insane energy boost it gave me, I got my waist down to the smallest it's been since I was in my 20s ( I'm 65 now). i didn't do anything crazy diet-wise other than cut out what I call extras.