Cellucor C4 Performance Energy Cosmic Rainbow - 16oz
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Guests are saying
The Cosmic Rainbow flavor of C4 Performance Energy has garnered mixed reactions from guests, with many praising its unique taste that resembles Skittles. While some appreciate the energy boost and zero sugar content, others find it overly sweet compared to the original Skittles flavor. Guests enjoy the refreshing taste and the nostalgic experience it provides, making it a popular choice for workouts and daily energy needs. However, concerns about ingredient changes and sweetness levels have been noted.
Summary created by AI from text of reviews reflecting recent feedback provided across different star ratings (includes incentivized reviews)
4.7 out of 5 stars with 146 reviews
1 out of 5 stars
23 June, 2025
originally posted on C4 Energy
Cosmic Rainbow =/= Skittles
I have no idea how it is legally possible that reviews of Skittles C4 are on the Cosmic Rainbow product. They're not the same. Cosmic Rainbow is WAY too sweet. Cellucor also needs to stop allowing vendors to replace Skittles orders with Cosmic Rainbow orders. They're not the same. They have different ingredients and tastes.
4 out of 5 stars
3 June, 2025
originally posted on C4 Energy
Cosmic Rainbow C4
I like the Cosmic Rainbow but, I LOVE the original Skittles flavor more. I don’t know why they had to change the recipe/name but the Skittles was wayyyyy better, therefore; I gave Cosmic Rainbow a 4 star instead of 5.
1 out of 5 stars
24 May, 2025
originally posted on C4 Energy
NOT EQUIVALENT TO SKITTLES
Absolutely terrible!!! change the can to something else!!! Be upfront with your customers when their favorite beverage ever will no longer be available!!! And BRING SKITTLES BACK!!!
1 out of 5 stars
3 April, 2025
originally posted on C4 Energy
No Rainbow For Me
The Cosmic Rainbow flavor is terrible, too sweet. I tried it because because I've been a huge fan of the Midnight Cherry and Skittles for a while now, but both of those started disappearing from the shelves. Are you guys discontinuing those??? I hope not! You used to carry the regular Cherry flavor too, and sadly that was discontinued a while back and replaced by the Popsicle Cherry which is also way too sweet. I tried all the other flavors but they are disappointing, and no one seems to be buying them at my local stores either.
5 out of 5 stars
2 April, 2025
originally posted on C4 Energy
great product at a better price than most..
C4 Performance Energy® Carbonated is a quality product. I've never had any quality issues with this brand. I also liked the price. Overall, I'm very pleased with my purchase. I also appreciate that my order came quickly.
5 out of 5 stars
15 May, 2024
originally posted on C4 Energy
Best pre workout energy drinkkk!
Oh man I am obsesssedd with this Skittles C4 performance. This is the only energy drink that makes me feel something and gets me hyped up. 10/10 recommend
1 out of 5 stars
24 April, 2024
originally posted on C4 Energy
Trash
Do not buy from this company they violate federal law by baiting a switching their promotions and then lver charge you.
5 out of 5 stars
8 March, 2024
originally posted on C4 Energy
best energy drink ever!!
Love the flavor, doesn't taste like any other sugar free options and I finally feel awake!! Thank you C4!!
5 out of 5 stars
30 September, 2023
originally posted on C4 Energy
Great flavor
This is my favorite flavor. Works well in the morning or before a workout
1 out of 5 stars
14 September, 2023
originally posted on C4 Energy
sick as a dog
I was super hyped to find something to make me go longer in the gym but an hour after drinking this, for the first time, I was extremely nauseous for 30 minutes then my body forced me to throw it up.
4 out of 5 stars
13 September, 2023
originally posted on C4 Energy
New Design?
I noticed a new can design when I purchased my C4 Skittles today and then I also noticed that there has been a change in the calorie count in the can. Why is that?? Does anyone else know? Or can someone from Cellucor reply back and explain that?
5 out of 5 stars
30 August, 2023
originally posted on C4 Energy
Taste and effective
Love this drink! Used to take the powdered pre work out which was awesome and saw this drink at the gas station one day. Instead of buying my normal coffee before work I drink these now. Taste is amazing! The feeling is like a natural boost of energy. There’s a lot of varieties too when it comes to flavors. So happy I stumbled upon this drink.
5 out of 5 stars
23 August, 2023
originally posted on C4 Energy
Amazing flavor!
This is my absolute favorite flavor, it’s like eating candy! Super refreshing and energizing for a pre or post workout.
1 out of 5 stars
18 August, 2023
originally posted on C4 Energy
Why add artificial flavors???
Why on earth would you add artificial flavoring when you already had a great product without artificial flavors or dyes??? You’re going backwards because health minded people don’t want that crap. I searched high and low for a drink I liked that didn’t contain all that and now change it??
5 out of 5 stars
15 August, 2023
originally posted on C4 Energy
New C4 Skittles
Amazing taste, my most recent case of C4 Skittles now has 10 calories the old C4 was Zero calorie.
5 out of 5 stars
14 August, 2023
originally posted on C4 Energy
BEST ENERGY DRINK THAT GIVES ME THE BOOST THAT I NEED WITH NO CRASH AFTERWARDS
[This review was collected as part of a promotion.] I have been a huge fan of drinking C4 energy for awhile. This is bar none my go to energy drink to help me power through the daily grind of my day and life in general. The flavor is absolutely amazing!!!i really feels like you are eating a handful of skittles. Love the crossovers with skittles and also the starburst flavors. Plus the fact that it’s zero sugar and that they taste amazing makes this even better. If you are on the fence of buying these get them. They are really amazing!!!!!!
5 out of 5 stars
2 August, 2023
originally posted on C4 Energy
Tastes So Good!
[This review was collected as part of a promotion.] This energy drink gives me the best pump and keeps me focused for classes. The flavor is also my favorite for any energy drink, I always reach for this drink more than any others!
5 out of 5 stars
14 July, 2023
originally posted on C4 Energy
Skittles
Love this flavor I buy it all the time it’s definitely one of my favorite
5 out of 5 stars
16 June, 2023
originally posted on C4 Energy
Flavor on point
This is seriously the best flavor! Genuinely tastes like skittles without the sugar and all the energy boosters!
5 out of 5 stars
16 May, 2023
originally posted on C4 Energy
So delicious
[This review was collected as part of a promotion.] I dont eat candy much or so. I have to say this is very tasty and I love it. I enjoy almost every day first thing in the morning to start off my day in the morning on my workout. I really hope you all come out with more candy flavor.