I’ve been using Scivation’s Workout Stack and can honestly say that it is the best workout combination I have ever used. The stack consists of Scivation’s Vasocharge that you take pre-workout and Xtend which you take during and post-workout. You can feel the Vasocharge working almost immediately when you begin drinking it. The first time I used it I couldn’t believe the way it took me from tired to energized and ready to lift. Both Vasocharge and Xtend mostly consist of B vitamins and amino acids which to me makes me feel good because they are both safe ingredients that have no negative side effects. I have never had a headache or upset stomach resulting from taking the stack like I’ve had with other products. Supplement Central has the stack on their website priced very reasonably. Overall I think anyone that tries this combination out will be very impressed with it.