I was researching vitex a couple weeks ago because I wanted to get SAN Endotest Pro for libido.
Good luck finding info on vitex,it`s very scarce and contradicting.
As I understood,it`s suppose to stimulate libido in small doses and to reduce it only in high doses.
btw don`t rely on vitex for prolactin control on cycle.
Get some caber or prami on hand and use them only if you experience some bad prolactin sides,otherwise no need.