My general suggestion for everyone is going to be to make sure that you've been rotating the herbs for a solid three months, along with proper diet and exercise routine before even attempting to play with prohormones. I'm sure you could argue the point for more time under normal training, but three is going to be my bare minimum recommendation.
It's also going to be made very clear that prohormones are NOT necessary to reap any of the benefits laid out in this program.