After all the Pro-hormone talk here recently, I decided to get down to the cold hard facts. I have done a lot of research on the differences of Pro-hormones and Anabolic/Androgenic Steroids for term papers when i was in college.
Here is the lowdown: The disadvantages of PH is with their molecular structures. They are missing essential carbons and hydrogens in key positions at the molecular level. They are prodeuced to mimic the originators of Testosterone and Nortestosterone(Deca).
The problem lies on how the body interprets it once it enters the blood stream. Unlike Testosterone, PHs are not made in the body from cholesterol or pituitary glands. They are a foreign compound that the body has to decide what it is first, then figure out what to do with it.
Because of its foreign properties, the body decides that it it is a form of Test but shaped in a strange manner. Even though the user will get gains in strength/mass/agressiveness, the body senses the bad properties of the PH and it tends to affect the liver and disrupt the endocrine system dramatically.
Take Methamphetamine for example, it is a foreign substance made up of all sorts of compounds. When entering the bloodstream, the body recognizes it is supposed to produce adrenaline. However, it does not recognize the other harmful shit in it and it causes side effects.
The bottom line is that staying to natural compounds is going to give u better results over the long run than oppossed to foreign substances that hit your body hard and confuse it. Not all PHs are bad, and I know that the real stuff is hard to get a hold of, but be safe and use wisely.