I used Ostarine not long ago... I started it while running 750mg test cyp and did that for two weeks. I dropped the test and stayed on the Osta during PCT. Did they fight over receptor sites? No clue, but it seemed like it amplified the test. I got greasier (gross), stronger, more aggressive and stronger. Did I mention stronger? I love Ostarine. Often overlooked to our detriment IMO.