Here's a link guys that tell you how much of any anabolic substance is in your blood at any time so you can plan a cycle. It's not perfect, as I've done some research on half lives, but this one is actually pretty good from what I've seen.You just punch in what you plan to use, and use the calculator to tell you how much is in your system at any given time. Always here to help. Here's the link
http://www.come.to/roidcalc