Pro hormones are more dangerous then "real" AAS. They are more toxic and less effective, as well as they are overly priced. One thing about PH's is that they have a lot of similarities of "real" AAS, but the catch is that they are chemically altered to make them legal...at least that was the idea before all of them were banned. It's these "alterations" that make them more toxic and far more dangerous to the body. I'll give you a first hand example: Long before I begin using AAS I used PH's...mostly 1-AD and M-1T. After a year or so of using these I went in for a routine physical and my liver was in a mess, values were as high as a chronic alcoholic...no, it wasn't from heavy drinking, I rarely drink, but it was caused by the PH's...it's the only thing it could be. On top of that, I started having a rash that broke out over most of my body, which sucked big time. I immediately dropped the PH's and I've never had any problems since. I've run several cycles of AAS since that time, and I get regular check ups throughout the year, and not once have my liver values been out of wack, no more rashes, no high bp, no high cholesterol, no acne, no nothing other then added strength and size and a better over all well being...it should be noted that I have run some decent size cycles with a fair amount of orals, and still everything has been OK.