C4 Ultimate Power

C4 Ultimate Power

Pre-Workout & Testosterone Support Powder For Pumps, Energy, Focus And Strength*
Ultimate C4 Performance with Added Testosterone & Performance Blend Supplying KSM-66®, Fenugreek And elevATP®
5.7  out of 10  (3 Reviews)
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For a limited time, buy 1 C4 Ultimate Power, 20 Servings & get 1 FREE!

Product Overview

Our Most Diesel Pre-Workout With Testosterone Support*

C4 Ultimate Power Containers

The Power of P6®

Fusing the explosive pre-workout energy core of C4 Ultimate® with key ingredients from our powerful P6® Testosterone and Performance Blend, C4 Ultimate® Power is a combination testosterone support product and pre-workout unlike anything else on the market.*

Designed to elevate your energy, focus, power output, and testosterone levels, C4 Ultimate® Power will help you power through every training session and prime you for harder, heavier, and more productive lifts.* With so many ingredients dedicated to powering up your results, C4 Ultimate® Power is in a league of its own.*

Take a look at the key factors that make C4 Ultimate Power.

Powerful Key Ingredients

Testosterone & Performance Blend

KSM-66® Ashwagandha

A daily serving in healthy adult men supports normal testosterone levels, strength, muscle size, sexual function, and endurance.*


Supports healthy testosterone levels while minimizing the unwanted conversion of testosterone to DHT.*


Shown to support an increase in lean muscle & strength, promote increased power output and training volume, and support higher levels of mitochondrial ATP – the energy currency of the body.*

Ultimate Energy

Caffeine (300mg)

Caffeine is a well-studied stimulant that has numerous energy, performance, and even fat-loss benefits.*


Tetramethyluric acid, or theacrine, is an alkaloid structurally similar to caffeine. Preliminary human study results suggest that the body doesn't adapt to TeaCrine as quickly as it does to caffeine, therefore prolonging tolerance.*


This plant extract may act similarly to yohimbine, and its effects are amplified when paired with caffeine.*

Ultimate Pumps

Citrulline Malate (6g)

A precursor to arginine and nitric oxide production, 6 grams of citrulline may support an increase in nitric oxide levels.* It supports the ultimate pump, especially when paired with arginine.* Note that 6 grams is the entire scoop size of some pre-workouts. In C4 Ultimate, it's just the pump foundation.*

Citrulline Nitrate (1g)

The latest Citrulline innovation technology - to help you achieve the ultimate pump.*

Ultimate Performance

CarnoSyn® Beta-Alanine (3.2g)

A full, clinical dose of this patented form of beta-alanine supports muscular endurance.* Beta-alanine can sometimes produce a harmless skin-tingling sensation.

BetaPower® Betaine Anhydrous (1.5g)

Helps maintain cellular electrolyte balance and promotes hydration.*

Ultimate Focus

AlphaSize® A-GPC

Supports an increased mind-muscle connection in the gym.*


Supports positive mood and cognitive function.

Huperzine A

A nootropic that may support memory, learning, and concentration.*

Taurine (1g)

Helps support mental performance when paired with caffeine and B vitamins.*

A Legacy of Excellence

We've been pioneering, building, and perfecting pre-workouts longer than most brands have been in sports nutrition. For nearly a decade, the C4 family has led the pre-workout category with explosive energy and performance, the best flavors, clinically studied ingredients, and cutting-edge formulas.*

We're obsessed with research, improvement, and results. We're innovators and leaders, and we're not new to our work. We have a legacy of building the best, most effective pre-workouts available.

We can comfortably say, without a doubt, that the C4 Ultimate line is the strongest series of pre-workouts we've ever created.

The C4 Ultimate line is the culmination of a decade of hands-on work in the pre-workout space. We're not talking about building a product in a matter of months. C4 Ultimate Power combines everything we've learned over years of study and real-world product development to deliver testosterone support on top of energy you can feel, powerful pumps, muscular endurance, extreme focus, and peak performance.* Consider C4 Ultimate Power a masterpiece from pre-workout craftsmen.

Clinically Studied,Patented Ingredients

No matter how big the scoop size or how revolutionary it claims to be, a great pre-workout starts with best-in-class ingredients used in effective doses. Since ingredients are not created equal, patented ingredients are important for multiple reasons, particularly because they're backed by quality manufacturers who rigorously test and research their products to ensure efficacy and safety.

Patented ingredients are the best in their categories, or they're so novel that they're complete category-creators. C4 Ultimate® Power’s legendary P6® Testosterone and Performance Blend supports healthy test levels along with increased strength, muscular size, sexual function, and endurance.*

The Ultimate Formula

Creating the perfect pre-workout for people who demand nothing less than the best from themselves and their supplements has been no easy task. It's taken us years of work, the best ingredients from around the globe, and a consistent commitment to innovation, formulation, and product development.

We're proud to say that the formula powering each serving of C4 Ultimate Power delivers an ultimate experience on every level: the ultimate in testosterone support, energy, pumps, endurance, performance, and focus.* This is not a pre-workout for the weak or weekend warrior. C4 Ultimate Power has been engineered for athletes, lifers, and lifters who aren’t afraid to work, sweat, and hustle for their next best.*

The C4 Ultimate Power formula delivers the explosive energy and performance you love from C4, plus a legendary testosterone technology blend, nootropics, mood enhancers, pump amplifiers, and endurance support to push you to your ultimate limit.*

The Cellucor Difference

Every tub of C4 Ultimate Power is the result of rigorous testing and research to ensure you get the highest-quality product possible, without compromise.

Our commitment to the following areas makes Cellucor stand above the pack:


We put every flavor of C4 through 100s of flavor tests. Seriously. And we don't settle. If a flavor doesn't measure up, we move on. We're dedicated to making the industry's best-tasting products, and nothing less will do.


We utilize an industry-leading evaluation method when working with ingredient suppliers, and we conduct additional stability testing on our raw ingredients to make sure our formulas have great physical stability. We also visit our key ingredient suppliers directly so we know exactly what we're putting in products, and we're very selective about working with only the best partners. (The same is true with our packaging.)

Product Development

Our in-house product development team has years of research and expertise, and a true passion for sports nutrition. We don't rely on a single person's opinion to build product. We have a team of world-class formulators who evaluate, debate, and discuss the latest research before we even put a formula down on paper. Add our incredible relationships with the world's best ingredient manufacturers, internal testing, athlete feedback, and years of leading the industry, and you get a development process that's second to none.

Commitment to Customers

We're committed to your results. At the end of the day, C4 Ultimate Power is your product. If you don't like it for any reason, we'll gladly refund or replace it. We're here for you.

Ratings & Reviews

C4 Ultimate Power
Overall Rating
3 Ratings
Verified Buyer Rating
2 Ratings
Average Flavor Rating
2 Flavors
Top Rated Flavor
Cherry Pie
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Feb 18, 2020
Verified Buyer
  • 5 Cherry Pie

I dont know if it's the flavoring or the additional ingredients but this one upsets my stomach. I use regular C4 ultimate with no issues but ive done 4 workouts with this stuff and they go great till i get the rumble guts and spend the next 20 min in the restroom. Ill be switching back to normal stuff.

Jan 21, 2020
Verified Buyer
  • 4 Cherry Pie
  • 4 Peach Cobbler

The ingredient profile is solid. The felt effects are fantastic (energy & focus, primarily). Overall, It's a great pre-workout formula (w/ some additional goodies) at clinical doses... However, it tastes terrible. Both flavors are pretty dang rough. Don't get me wrong, a slight improvement over most flavoring systems from say 15 years ago... Ever tried Gakic powder?! Yayy for drinking battery acid!... All in all, these days our market is absolutely over-saturated with pre's that are both effective and pleasant tasting. For that reason (price tag also being a slight factor), I will not be purchasing the Power version again. I will, however, continue to utilize regular C4 Ultimate. It will likely remain my favorite, for a long time to come. Huge fan of Cellucor, just not this specific product.

Dec 20, 2019
  • 10 Cherry Pie

The Ultimate Power P6 Preworkout is a knockout preworkout! I recently got the chance to take it for a test drive and it’s been nothing short of great! Currently they have two flavors on the market. Peach Cobbler and Cherry Pie. I got to try the Cherry pie. My first day taking this I was very unsure of how I liked the flavor but I still gave it a chance. When taking it you get a hard hitting cherry flavor right from the start and then the pie flavor comes in the after taste. After a few more times taking it I am definitely a fan. Profile: The Ultimate Power P6 Preworkout is a combination of the C4 Ultimate preworkout and the P6 Testosterone product. Together they are designer to elevate your Energy, Focus, Power output, and testosterone levels. Effectiveness: I am going to say this is very effective. During each workout I had energy, very focused feeling, and felt like my workouts were more productive. It’s easy to see why it’s so effective with 5 different areas of focus. Testosterone & Performance blend, Ultimate energy (300mg), Ultimate Pumps (6g of Citrulline Malate)(1g of Citrulline Nitrate), Ultimate Performance (Beta-Alanie and Betaine Anhydrous), Ultimate Focus. Taste: As I stated above the flavor is good. It’s definitely cool to have a flavor that’s outside the box of normal flavors. I mean look around at all the companies out there who has a pie flavored preworkout? None that I can think of. When you drink the cherry pie it taste just like you are actually eating a cherry pie. Mixability: This mixes very well. Little bit of foam on the top after shaking it but there is no left over partials floating at the bottom. It doesn’t leave a chalky feeling in your mouth either. So this is a win.

1 Size
20 Servings
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Cherry Pie
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Price: $59.99  ($3.00 / Serving)
Flavor Rating: 4.8
Ultimate C4 Performance with Added Testosterone & Performance Blend Supplying KSM-66®, Fenugreek And elevATP®

What's in Cellucor C4 Ultimate Power

Serving Size 1 Level Scoop (20.6g)
Servings Per Container20
Amount Per Serving %DV
Calories 5       
Total Carbohydrate 1 g <1%**
Sugars 0 g
Vitamin C (as Ascorbic Acid) 250 mg 417%
Calcium (as Calcium Silicate) 100 mg 10%
Sodium 60 mg 3%
Citrulline Performance Complex 7g
Citrulline Malate 6g
Citrulline Nitrate (NO3-T®) 1g
CarnoSyn® Beta-Alanine 3.2g
Creatine Matrix 3g
Creatine HCl 2g
Creatine Nitrate (NO3-T®) 1g
BetaPower® Betaine Anhydrous 1.5g
P6® Testosterone Technology 1.325g
KSM-66® Ashwagandha (Withania somnifera) root extract 675mg
Fenugreek (Trigonella foenum-graceum) seed extract 500mg
elevATP® Ancient Peat and Apple extract 150mg
Taurine 1g
C4® Ultimate Energy & Focus Blend 758mg
N-Acetyl-L-Tyrosine, Caffeine Anhydrous (300mg), Theacrine (as TeaCrine®), AlphaSize® A-GPC (Alpha-Glyceryl Phosphoryl Choline) , Zembrin® (Sceletium tortuosum) aerial parts extract, Rauwolfia vomitoria root bark extract, Huperzine A [from Toothed Clubmoss (Huperzia serrata) aerial parts extract]
** Percent Daily Values (% DV) are based on a 2,000 calorie diet
† Daily Value not established.
Other Ingredients:
Calcium Silicate, Silicon Dioxide, Natural & Artificial Flavors, Sucralose, Salt, Acesulfame Potassium, Polydextrose, Cinnamon, Caramel (color), FD&C Red #40.

Directions For C4 Ultimate Power: Take one serving (1 level scoop) of C4 Ultimate® Power, mixed with 10-14 fl. oz. of water 20-30 minutes before training. For best results, use for 8 weeks in conjunction with a resistance training program.

Warnings: THIS PRODUCT IS ONLY INTENDED TO BE CONSUMED BY HEALTHY, ADULT MEN, 18 YEARS OF AGE OR OLDER. NOT FOR USE BY WOMEN, especially those who are pregnant or nursing. Do not use this product if currently taking PDE5 inhibitors or nitrates for chest pain. Before taking this product, consult a licensed, qualified, health care professional, especially if you are taking any other dietary supplement, prescription drug or over-the-counter medication, or if, you suspect you have or have been treated for, diagnosed with or have a family history of, any medical condition, including but not limited to: high or low blood pressure, diabetes, anxiety, cardiovascular, psychiatric or seizure disorders, cardiac arrhythmia, stroke, heart, liver, kidney, or thyroid disease, or difficulty urinating due to prostate enlargement. This product contains caffeine and Sceletium tortuosum (Zembrin®) and should not be used in combination with other products containing caffeine or Sceletium tortuosum (Zembrin®) or stimulants from other sources, including but not limited to, coffee, tea, soda, or other dietary supplements and medications. Do not use this product continuously for more than 8 weeks. Discontinue use 2 weeks prior to surgery. Immediately discontinue use and contact a medical doctor if you experience any adverse reaction to this product. Do not use if the safety seal is broken or missing. Store in a cool, dry place. KEEP OUT OF REACH OF CHILDREN. Some settling of powder may occur during shipping and handling, which may affect density of powder. This product contains the servings indicated when measured exactly by weight. Some individuals may experience a harmless tingling sensation, which is attributable to Beta-Alanine. USE ONLY AS DIRECTED.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.