I'm just gonna tell you this right now, I'm fairly new to this too. I've used a lot of stuff in a short amount of time. I've hit a lot of the highs on "harsh" stuff: Tren, Halo, Anadrol, Deca. Anadrol by far has been the harshest on my body. So I really don't suggest you mess with it. If you wanna be smart and go for the marathon, go 300 or 350 test. That's it. If you want to be aggressive and feel like you're being a little crazy, go 500. The more conservative voices are gonna say 500 is not necessary, not necessary first time out especially. But like, if that's where your head is at "I wanna go big", just hit 500 test. You won't be disappointed and you'll do it right. Get comprehensive metabolic panel before and after.