GNC products at an Amazon price!
I've used this as well as the Performance & Vitality packs and I'd have to say, I'm not going to renew my GNC gold card any time soon.  I can get products here cheaper than GNC's gold card can.  I take the entire vitapak with a protein snack about an hour and a half before my workout and it usually kicks in in about half an hour with the rush that is the X12 thermogenic.  It gets me pretty pumped to get my workout in and I'm able to blaze through a crossfit workout with maximum effort.  Remember, this is a SUPPLEMENT, so you won't get desired benefits unless you eat, sleep, and workout the right way.
Rating: 5 stars