I'm taking the week off from the gym but I tried this anyway because I couldn't wait. It mixes well with little to none residue. Tastes very good to me. Fruit flavored. I used it for energy later in the day. Mixed up the whole sample in 8 oz of water. To assess tolerance I only drank 4 ounces at first. Waited an hour or so and drank down the rest. I went from feeling like I was about to fall asleep to being awake and alert on the first 4 ounces. That lasted about 1 hour and then I drank the remaining 4 ounces. Same results. No jitters, smooth energy although I'm not sure how the entire packet would feel. I'm guessing that taking the entire packet would be great for pre-workout since it should give me more of a boost. Great stuff.