My experience with them, is you usually start getting better pumps right away. Currently, I'm using Paradeca with a Tribex 500 stack and it's working well.

I noticed a difference in strength i a couple of days. Be sure you're taking the recommended amount, not less. Sometimes they can be quite expensive. By the way, depending how you take prohormones, much it is lost through liver filtration. They never have the same affects as real juice. Although I've never juiced, just what I've heard.