Yes, GW-501516 goes like peanut butter and jelly together with s4... take it 20 mg once a day 30 minutes prior to your workout.. on non workout days, take it all at once in the a.m. S4 is the only sarm that needs to be taken in split doses due to the very short half life it possesses... otherwise, once a day dosing is all that is recommended with the others...
i would HIGHLY recommend stacking the two