I've used the drinks and such before and while they do work (most of the time) I've had them work for me but I know ppl who used them and still failed. One thing about them is you have to follow the directions to the fucking T or it will most likely not work. But I'm with MoreMeds I been using the synthetic stuff cause there is nothing to really worry bout with them. If your not gonna be watched while taking the piss test I would go with the Synthetic personally.