Cellucor C4 Smart Energy Drink – Boost Focus and Energy with Zero Sugar, Natural Energy, and Nootropics - 200mg Caffeine - Peach Mango - 12 FL OZ (355 ml) - Pack of 12

Noticeable improvement in energy level and focus on the C4 Smart Energy version. Bought this for working on a critical project, had it in the morning after breakfast. I was able to avoid mental and physical fatigue and keep working for 10+ hours straight, with full on energy, focus and motivation, without needing any breaks/coffee/tea in between. Remember you can have only one per day and I believe its not recommended to use this continuously for more than 8 weeks. I intend to use this only when I have something critical to get done. Taste is very good (Peach Mango / Smart Energy)

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I have tried so many flavours and so far this is the tastiest flavour , never get bored of it , and it make you workout for 3 hours non stop ! Unfortunately must of cans are half empty, so it's a rip off!!!

I have been drinking these ever since I started taking my ultrasound physics course to help with studying and testing and let me tell u... these make me focus and enjoy my learning time a lot more. I am generally a very curious person and love to learn but I also struggle with unmedicated ADHD so coffee has always helped me in the past with waking up and that boost of mental clarity and energy but I needed something more to keep my mind from wandering off and seeking those dopamine rewarding stimulators that would prohibit my studying and the Smart Energy C4 was just the right thing for that! Not only does it give me that perfect energy boost I need from caffeine, it also has a different ingredient than other energy drinks I have tried called Citicoline (in their ingredients it is called Cognizin Citicoline which is just a brand of Citicoline). But here's the cool thing about Citicoline... its a nootropic! Nootropics are a class of drugs that improve brain function. ADHD meds are a type of nootropic but in a different form. Citicoline works to improve brain function and memory and has been studied to even release some sort of dopamine stimulation in the brain. It acts to increase cell membrane stabilization and in re-synthesizing our phospholipids quickly in our mitochondria of our cells. I would look it up if you want to know more but it's so interesting how Citicoline works in our bodies! Anywaysss to diverge from that, I have always had such a pleasant experience with these. I have mood boosts, I am able to focus on one thing at a time, get my work done, recall information 10x better, I am much more curious, and the flavor is sooo tasty. Definitely would say tho, don't drink more than one a day, specially if you have already had a caffeinated drink or are on some sort of medication that speeds up your heart like any other stimulant! I am not a doctor but I am educated enough on this to know you shouldn't do that. But yeah one should do it! I typically don't even finish an entire one in one sitting I usually sip it throughout the day or drink half at a time. It's a wonderful drink that I am glad I found :) Highly recommend if you are a prior gifted kid like me and struggle with burnout or ADHD and know your capabilities but struggle to use them... it has been a real life saver!

Delicious, good energy, please bring more flavours to intl prime shipping.

The flavors are great! And it’s sugar-free!!! The cost is economical for the purchase and I was really happy with what I received. It doesn’t leave you feeling jittery and it doesn’t make your heart flutter. I think you would be happy with your purchase.

I was hesitant on purchasing this. Hesitation gone! Great taste, no jittery feeling and no crash out. Definitely recommend to those looking for a boost.

Only reason this isn't a 5 star review is because they took away the initial slick design of this can and replaced it with that cheap-looking depressing design that's very similar to Celsius, which is an inferior product compared to C4 Smart drinks. Otherwise every flavor of this is amazing, the energy is just right, focused, no gitters and won't mess with your sleep any worse than a late cup of coffee would. As a matter of fact it completely replaced coffee for my mornings. Great for office work and studying. I just really hope they bring back the initial design one day.