I alt between Nitric Shock and a like product that contains caffeine. I started Nitric Shock because I didn't want to be taking caffeine everyday. I use Nitric Shock about 2 times a week. This is a pre workout drink made to give you energy and focus during workouts and it works very well for that. However, some people often complain that Nitric Oxide makes them have to use the restroom shortly after taking the product. That is just something that happens with all nitric oxide supplements and in all reality if that does happen it's most likely because your not regular so it may just be a good thing. Ok so about Nitric Shock, this product does help focus and energy levels. It stacks up right around par with any other nitric oxide supplement. One thing Nitric Shock boasts is its use of acai berry (which maybe why the berry blast IMO tastes the best) however, I really don't see any of the weight loss results that Acai berry seems to be known for. If you take Nitric Shock and jump right into working out you may feel some type of tingly weird feeling in both arms and hands switch if your like me will make you stop (if you ever feel that it is break time) this doesn't seem to be a problem other then it's itchy and weird. The only reason why I didn't list that as a side effect is because it is avoidable by waiting the 20-30 mins the directions say to wait after taking before starting the workout. I had to dock the 1 star because of sucralose and the taste. The suralose as well as just plain being bad for you also makes the shake taste way too sweet. I never understand why people put sucralose or sugar in supplements. Most people just chug supplements anyway why throw in that little bit of bad? The taste is like bad candy. The orange taste like circus peanuts and the berry blast taste that generic fake berry candy flavor. I haven't tried the watermelon yet. Well I'm not sure if anyone would need anymore info or if there is a way for me to respond to questions (first review on this website) but if there is I'll be glad to follow up on any questions. I have been using Nitric Oxide supplements for over a year now and have had good results with them. Also word for the wise if you want results your going to have to watch your diet and workout often. You can't just do one without the other and expect to look like king Leonidas.