Performance Energy Drink with Zero Sugar, Cosmic Rainbow, 12pk | 200mg caffeine and performance ingredients deliver explosive energy, endurance and focus.

I’ve been drinking C4 for a while now, and it’s one of my favorite pre workout energy drinks. I usually start drinking one about 30 minutes before the gym, and since it takes me a while to finish, I’m normally done with the can by the time I’m about halfway through my workout. It gives me a nice boost of energy and helps me stay focused during training. The flavors I’ve tried, including Cosmic Rainbow and Cereal Killer and The Variety Pack with the Cherry flavor, are both really good and don’t have the overly artificial taste that some energy drinks do. I also like that they’re zero sugar. I also like that they are carbonated! One thing to keep in mind is that each can contains 200 mg of caffeine, which is a decent amount. If I drink one of these, I usually skip my coffee for the day because that’s already enough caffeine for me. I definitely wouldn’t drink one close to bedtime, especially if you’re sensitive to caffeine or have trouble falling asleep. Personally, I can still feel the effects for several hours afterward. Pros: * Great pre workout energy boost * Tastes good * Zero sugar * Helps with focus during workouts * Convenient alternative to mixing pre workout * There are variety packs (different flavors) Cons: * 200 mg caffeine may be too much for some people * Not ideal later in the day if you’re sensitive to caffeine How long does energy last? For me, I feel the energy for about 4 hours, though everyone’s caffeine tolerance is different. How does 200 mg caffeine compare? It’s roughly equivalent to about 2 cups of coffee, so it’s definitely noticeable but not excessive if you’re used to caffeine. Energy drinks vs coffee for workouts? I prefer this before workouts because it’s convenient, tastes good, and gives me a more “pre workout” feel than coffee alone. Energy drinks for gym performance? I find they help improve my focus, motivation, and workout intensity when used before training. Best pre-workout energy drink? This is one of my favorites because of the flavor variety, zero sugar formula, and reliable energy boost. Another reason I keep buying these is the value. I’ve found that purchasing them by the case on Amazon is usually cheaper than buying individual cans in stores, which adds up if you drink them regularly. It’s convenient to have them delivered and stocked at home, especially when I know I’ll be using them before my workouts throughout the week.

If you're on the lookout for a delicious energy boost, C4's Cosmic Rainbow flavor is definitely worth a try! This zero sugar drink manages to hit the sweet spot without being overly sweet, making it perfect for those who want a tasty pick-me-up without all the sugar guilt. You'd never guess it’s sugar-free! The flavor is a delightful medley of fruity goodness, reminiscent of a fun summer day. Each sip is like a carnival for your taste buds, with a vibrant blend that really showcases all the fruity flavors. It's playful and refreshing, making it a joy to drink whether you’re gearing up for a workout or just need a little extra energy to power through your day. What I love about Cosmic Rainbow is that it’s not just for gym-goers; it’s great anytime you need a burst of energy. The balance of flavors keeps things exciting, and it's definitely a drink you’ll want to keep on hand for those moments when you need an extra kick. Alongside its delicious flavor, C4 Cosmic Rainbow also packs a punch with its impressive ingredient lineup. This energy drink is formulated with key components designed to boost your performance and energy levels without the crash that often comes with sugary alternatives. One of the standout ingredients is **Beta-Alanine**, known for enhancing endurance and reducing fatigue during workouts. Plus, there’s **Caffeine Anhydrous**, providing that much-needed energy boost to help power through your day or gym session. C4 also includes **Citrulline Malate**, which may help improve blood flow and enhance performance, making it a great choice for pre-workout fuel. On top of that, it's fortified with vitamins like B3, B6, and B12, contributing to overall energy metabolism and keeping you feeling vibrant. What’s even better is that all of this comes without sugar, artificial colors, or preservatives often found in energy drinks. So, you can enjoy the fun and fruity taste of Cosmic Rainbow while fueling your body with quality ingredients. It’s the perfect blend of fun flavor and functional energy—ideal for anyone looking to boost their day in a tasty way!

My husband is obsessed with this flavor! It tastes like rainbow nerds and even had a little tart to it. They are carbonated and refreshing for sure! You can't really tell they are sugar free either. The cans are a generous size and the texture is like soda. I definitely recommend this flavor and brand to everyone wanting something different.

One of our favorite flavors. This is the best priced pack for C4s we can find! They’re the big size drinks, and have become a big staple for my husband and I.

Why did you pick this product vs others?: I’ve been using C4 Pre-Workout, and it’s become a staple in my fitness routine. Whether I’m doing weight training or cardio, it gives me a noticeable boost in energy, focus, and endurance — without feeling jittery or getting a crash afterward. The flavor I tried (Fruit Punch) tastes surprisingly good — not too sweet or artificial, and it mixes well with water. I usually take it about 20–30 minutes before my workout, and by the time I hit the gym, I feel ready to push harder. The beta-alanine tingles are real, especially if you’re new to pre-workouts, but they wear off quickly and don’t bother me. I also appreciate that it doesn’t overload you with caffeine like some other products do — it’s a clean, focused energy that helps with performance without making you feel wired. Whether you’re just starting your fitness journey or looking for a reliable pre-workout to get more out of your sessions, C4 delivers. Just be sure to follow the serving instructions and stay hydrated!

Husband loves this energy drink. He’s had a few different ones and thinks the quality as well as taste is better than the others.

I got these on sale! My fiancé loves ❤️ them for work!

Great taste. Not as good as when it was skittles taste but still kind of taste like water down skittles now. Does great at supplying energy. One of the better c4 flavors.

Taste not so good, cotton candy by far much better