Your the moron with a lack of comprehension if this is ur answer to my question, U rekon ur so educated in roids and give a answer like that, what's anyone goin to learn from u? Nothing.
Bte2 thank u for ur time in giving me ur info!
Slow down everybody. Granted he is asking a question equivalent to why is it bad to stick my hand in fire, however we have all been there at one point. So cut him some slack. Besides ology is a non-flaming board.
Ape351 slow down as well. I know you feel like safety is being a jerk but, he is actually a pretty good guy and a valuable friend to have on these boards.
Okay now getting to your question.
Bte2 gave a somewhat adequate answer as to why testosterone is required as part of a cycle, however I believe your question was why can't you start with a deca/dbol cycle?
Deca is a 19-nor. As a result it can wreak havoc on progesterone levels in the body. This can cause lactating gynecomastia and requires the use of prolactin inhibitor's via dopamine agonists. Most new users don't have enough experience to combat this type of gynecomastia.
On to the dbols. Methandrostenolone was the first exogenous testosterone source and has a high occurrence of side effects. Of note in this discussion is aromatase enzyme's rather easy estrone conversion. In other words your dbol becomes estrogen and causes gynecomastia.
Now you have two compounds which cause gynecomastia via two different means and require different treatments. So if you get gynecomastia how do you treat it when you don't know what is causing it.
So veterans recommend a test only cycle as a preliminary cycle. That way you can determine if you have issues with testosterone aromatizing. This allows you to dial in a dosage of AI's to prevent any estrogenic sides. Then your next cycle you already have the exogenous testosterone AI's dosing so you know if you are having gyno issues it is the 19-nor and can treat accordingly.
I hope that helps you. Stick around and read the stickies on the boards and use the search function. Everything I have said is covered in the stickies.
Have a good one and welcome to ology.