My pharma test cyp is made with cottonseed oil. I've also used script test cyp in GSO made by a trusted compounding pharmacy and it was definitely thinner. When I started using some trusted UGL test it was my first experience with MCT oil and it was noticeably thinner from the first 2. And recently I've been using test and other compounds in Miglyol. If I had my choice I'd use Miglyol every time! As a matter of fact, I actively look for it in a source. It's about as close to injecting water as you can get right now as far as I'm aware. And I've never had pip with it. It will draw AND push thru a 30g pin with ease. Pinning quads and delts with a 30g half-inch is a breeze...and zero pip!