Steroid hormones require attentive and responsible approach. Before you start with the first course make sure to learn the following.
You have to have some experience in bodybuilding before you move on to start your first steroid course. Make sure you have at least 50% muscle tissue in your body. Remember that you must be over 21 as this is the age threshold when your uncontrived levels stabilize. Before 21 you produce enough testosterone without the need for additional therapy.