This is great as a PCT cycling agent. It helps replenish your liver so it is not damaged from supplementation or prohormones. Other than that it doesn't really do much, but it is only made to help your liver. IT works very well in what it is made for. I think it is very reasonably priced as well, so you can't go wrong with it. With every prohormone cycle, it is necessary to replenish your liver afterwards, and milk thistle is a necessary supplement for that.