Quote Originally Posted by JohnN
Ok, just so I understand...it has to match what your body produces(or more)? So if your body produces 40mg a week, 39mg injected will not shut production down? Then 40mg a week injected and over will shut you down, right?
Don't take that literally. It is not so cut and dried as that and not as easy to quantify. Let's just say that ANY significant amount of exogenous test will depress your endogenous test production. You quickly reach a point where you are completely shut down. Don't worry about that for short (10 week or so) cycles. Part of your injected test simply replaces what you aren't producing, so there is a tremendous difference between 100mg/week (not even noticeable) and 200mg/week (some modest gains with hardly any side effects, in beginners.)

With long estered test, it takes about 4-5 weeks to see significant strength gains and to see the beginning of actual muscle size gains. Why? Because each of your last several injections have left some test in you that has not yet left the body or been converted to other compounds. You have to consider each shot individually, and you can roughly calculate how much of that shot is left in you. So after 4 weeks or so, your first shot still has a small amount left in your body. The second shot still has a tiny bit more remaining. The third shot, still more. Finally you get to the most recent shot, which is still 100% in your body. To complicate things, the hormone is released into the bloodstream slowly, over time, so your serum test levels are not much influenced by the shot you took yesterday. So you can see how test builds up in the blood over a long period of time, much longer than the half-life figure.

Some users will "jump start" a cycle of cyp or enanth with a short ester such as prop, or with suspension, for the first four weeks, so that levels are high and the hormone is making it's effect felt after only a week. (oral jumpstarting is more common though)