The flavors are good. Mostly on the tangy side, but definitely drinkable. Mixes good for the most part... Needs to be shaken from time to time. The energy, pump, and focus is definitely there after 20 minutes of consumption. No bad side effects noted. I have used this product for the past 3 months and have had no stomach or headaches. No crash after use. (Posted on 1/31/12)

I didnt feel much energy boost, but did feel slightly less tired
during and after reps. (Posted on 1/31/12)

I've been using other brands of pre-workout drinks for a while now and I have found this to give the greatest results so far. My primary workout schedule involves 3 days of resistance training, one day of power yoga, and two days of intense cardio. I have used pretty much all of the top pre-workout drinks and had settled on (I know this is cliche) BSN's NO-EXPLODE. The second favorite was white flood. Loved White flood but I still got the most out of No explode. Unfortunately it gives you a crazy rush in the beginning that never made through my hour and a half plus workouts. On top of that it gave me a wanna vomit feeling and intense heart rate during cardio.

Now onto usp labs Jack3d. It's such a small dose and tastes just like crystal lite that it's a joy to drink. Really I love the taste. It doesn't have that chemical/ caffeine horrible flavor I had grown accustomed to.

I highly recommend it. It's cheaper than pretty much anything out there, it tastes better, and it works better from every aspect. No jitters, no stomach problems, small doses, no crash. Unlimited pumps, razor sharp focus, and the endurance to go for well over two hours. I was a little worried when I saw how small the bottle was. Then I opened it and was relieved to see how small the scoop was, haha. If you have the will to workout in the first place, your gonna get the ability to double your workouts with this stuff. Your gonna like it.

One last thing I want to share. Finish your workout! If you don't go to the gym pushing with everything you've got you will have way to much energy left on your hands. (Posted on 1/31/12)

I've been taking Jack3d for a while now. It's kind of difficult to say how great it works because how do I know I wouldn't have had as good a workout without Jack3d, right?

After several uses, I'm convinced that Jack3d works and it's worthy of my 5 star rating and I will be buying more cans of this as I get closer to running out.

Sluggish, yawny, unmotivated workouts suck. Jack3d prevents that. To me, that makes this a perfect pre-workout drink. (Posted on 1/31/12)

I am a 33 year old female slightly overweight and was looking for some kick to my otherwise boring workout routine. I read what the guys had to say about this product and decided to give it a try. This Jacked3d really WORKS!! I took the eight ounces of water and used only one scoop. At first I was thinking okay this is doing absolutely nothing. But as I continued my ride to the gym my lips, ear lobes, hands and face started tingling/prickling. I was like WHOA! I couldn't wait to unload all of this energy at the gym. I ended up doing cardio intervals on the treadmill for 50 minutes and then proceeded to do strength training. I couldn't believe it. I felt like Rocky Balboa running up the 1,000 steps of the Philadelphia library. Try it! Only one scoop to start. If you take more than one scoop in the beginning you'll be asking for trouble. (Posted on 1/31/12)

No joke, this stuff is amazing. I have to force myself to leave the gym now. I've tried most of the other popular brands of pre-workout concoctions, and this stuff ranks so far and above all the others it should be in a different category. I was shocked when I first opened the package to see that the bottle was so much smaller than the "other" stuff on the market. I thought, "oh crap, this stuff is going to be expensive!" Then I saw the little scoop. Jack3d is so concentrated that you use about 1/4 of the other guy's scoop per serving. When they say "no fillers," they aren't kidding. I have been able to up my weight limit across the board for all muscles groups. I have yet to experience a crash in the afternoon as I did with the "other" stuff. This stuff is awesome. (Posted on 1/31/12)

Like a lot of other folks here, I've used a fair number of preworkout/NO type supplements, and Jack3d is absolutely the best one I've used. Most recently I've just been using a 200 mg caffeine tab before workouts, which works nicely and inexpensively to keep up energy and intensity. Fair to say, I'm probably pretty tolerant to caffeine at this point, and I can tell when a supplement just packs in a ton of caffeine and calls it an 'energy' supplement. Jack3d is something different, from some basic research it only has maybe 66 mgs of caffeine in it per scoop, and most use 1-2 scoops and feel dramatic effects. (Posted on 1/31/12)

I just started working out like 4 weeks ago, but I go to the gym 5 times a week and I would get tired after I'd say 15 minutes, and could push myself to 30 minutes of vigorous training. While under the effects of Jack3d, I've gone for an hour of working out without getting tired, I just had to stop because it was time to leave! I personally did not feel energetic mentally, but I just never got tired, its insane!!

I also I have a high tolerance, usually nothing effects me at all, but this sure did! (Posted on 1/31/12)

i wanted to try this because the reviews were excellent. i started with one scoop, which was great! then i started with two scoops, which was off the wall, im afraid to try three. the focus is kind of scary but it allows you to lift with without feeling it, the day after you will definitely feel it. its also a constant energy source, upwards of twelve hours, i stopped buying coffee because its useless now. Some things that are kind of weird, it did make me a little aggressive, during my workouts, but not crazy, it also makes you feel competitive. (Posted on 1/31/12)

I am not a bodybuilder. I am an accountant, father to a one year old son, in a fairly new marriage and a graduate student. I am primarily a swimmer, I used to go for a mile at a time a few times every week, until my son was born. My workouts went to almost non existent. Six months ago I picked up some NoXplode. After that I got Pumpfuel and had a few cans of that. I was getting headaches and crashing hard after my workouts. I just couldn't get into the groove. Until I found Jack3d. Not only is this cheaper but I don't get headaches and I haven't built up a tolerance. (Posted on 1/31/12)

Jack3d is where it's at! The first few workouts I use the one scoop. As I progress through the tub I need to increase to 1.5 scoop, 2, and the full 3 by the end. There is really nothing out of the ordinary here. It's just the body getting used to the supplement. So, don't expect to use this one tub for 45 workouts, this will last me around a month of 5-day a week working out. (more or less)

The more scoops you use, the more that pre-workout 'Woooooooooooooo!!!!!!!!!' feeling is. Some products out there prevent exhaustion and extend workouts, etc. Jack3d does this, as well as, gives you a pre-workout feeling close to that of the pre-workout supplement 1MR (1 more rep).

This is not the end all pre-workout, because that is impossible, but this is absolutely one of the (at least) two end all pre-workout supplements. (Posted on 1/31/12)

After your face tingles, you know that the demons are coming as you go through a Jeckyll and Hyde transformation and become a different beast. Pray that no one gets in your way that day, for it will be their demise. (Posted on 1/31/12)

I didn't get much out of this product. I didn't feel wired and I didn't get the creatine pump!!! (Posted on 1/5/12)

Jack3d works well, but only if you use 2-3 times a week because you adjust to it. This product keeps me motivated in the gym without the crazy jitters. I will buy it again. (Posted on 1/5/12)

Used others before ie: NO Xplode, White Flood, Muscle Assualt, and Black Powder. This is the best yet. Even better, take the Grape flavor Jack3d with Optimum Nutrition's Preload Creatine Grape flavor and mix them 30 min prior, tastes great (Posted on 1/5/12)

It's an awesome product. out of all the pre workout supplements I took, I can actually feel that this product works. I felt I could lift a lot more weights for a longer period of time but be careful, You might feel like you can lift anything! The ONE side affect is this tingling, prickling feeling I get when taking it. I felt a little itchy but it went away as I began to work out. But other than that, once you get over the taste like most supplements, ITS GREAT!! love it. (Posted on 1/5/12)

Pros:
-Gives me the energy boost to get my rear in the gym.
-Small serving using minimal water so I can take it before a run without having a bloated belly.
-Great price for 45 servings.
-Works quickly, usually within 20min. (although the label says 30-40min)
-Workouts last longer, push harder, and feel better after.
-MAKES ME FEEL LIKE A SUPERHERO!

Cons:
-Taste. It's not the worst thing ever but I prefer a nice cup of orange juice.

I'm sure some of the rush I get is psychosomatic, but it works for me and I plan to continue using this product. Good luck! (Posted on 1/5/12)

I've never taken any pre-workout drinks before this. I was referred by a friend who takes this and wow!!! The first time I tried it, I had one of the best workouts ever! I had so much more strength and endurance! I've been using this for about 3 weeks now. I've gotten a little bigger already! I've been able to lift more weights since I've started using this. (Posted on 1/5/12)

I am 20 years old and have been lifting weights since i was about 15. I have tried many supplements and nothing has worked as well as Jack3d. I can feel the energy and strength with every pump. I get kind of a tingling sensation but thats how i know it is working. I love this stuff. (Posted on 1/5/12)

Let me first start off saying that I am no fitness expert or pro body builder. I'm just your regular guy who goes to the gym to keep fit and look good. Due to an always changing work schedule, sometimes my only time to go to the gym would be at odd hours of the day. Combined that with the work day mentally draining me, it was hard to find motivation to go. A few of my friends had this "pre work out" stuff they'd drink. I poked fun at them and called them roid junkies, etc. Well, one of them used Jack3d and asked me if I wanted to try it. Curious, I did. That's when the awesomeness started.

You don't see the full results of Jack3d until later in your workout. Before, I'd use to tire quickly. Not so much anymore. I'm mentally full of energy, and am able to continue until muscle failure. I should add if you are going to incorporate Jack3d into your work out, it's essential to look into whey protein for after workouts.

I still have yet to find a pre workout product that works as well as this stuff does. Two thumbs up! (Posted on 1/5/12)