Cellucor.com offers a 100% money back guarantee on all of our products.
current promo callout

C4 Ultimate



It’s the pursuit to kick ass and take names in the gym. Your crushing hunger to reach your new PR is the very reason why we’ve spent the last few years engineering the most hard-hitting, intense, and focused pre-workout on the market–one that matches your obsession with being better than you were yesterday.


It’s not for the weak. It’s not for the weekend warrior. This is for those that don’t have limits in the gym. Those that aren’t afraid to work, sweat, and bleed for their next best. It’s dosed to the brim with the powerful ingredients that your body begs for. You will feel the explosive energy run through your veins as you prep for battle in the gym. This maxed-out formula also packs a heavy punch of nootropics, mood enhancers, pump amplifiers and endurance boosters to push you to your ultimate limit. C4 Ultimate will challenge you to push for one more rep, one more set, and to pick up that heavy dumbbell you’ve been thinking about for weeks.

Are you ready to see what you’re made of? 



How do you take the C4 Ultimate?

We recommend to take one serving (1 scoop) with 10-12 oz of water 20-30 minutes before training.

Why does my skin have an itchy/tingling feeling after taking the C4?

Many of the C4 family of products are formulated with the amino acid Beta Alanine, which supports muscular endurance, and often has a temporary tingling/itching effect experienced by users about 10-20 minutes after consuming the product.

Should I cycle the C4 Ultimate?

Regarding products that contain stimulatory ingredients, we recommend to not use the product continuously for more than 8 weeks. Over time, your body could build up a tolerance for ingredients that support energy.

How much caffeine does C4 Ultimate have per serving?

C4 contains 300mg of caffeine per serving.

I am currently taking a PDE-5 medication for ED, why is there a warning on the label not to take this?

Because nitrates have the ability to relax the walls of the blood vessels to promote increased blood flow, taking nitrate ingredients in combination with product or medication that contain PDE-5 inhibitors could cause an unsafe drop in blood pressure.

Because some dietary ingredients also act as PDE inhibitors, please consult a licensed qualified health care professional before taking this product with any dietary supplement, product, or medication.

Can I stack other Cellucor products with C4 Ultimate?

You certainly can, however you should not stack stimulant based products such as preworkout and weightloss products together such as the C4 and SuperHD family of products.

What is C4 ID Series?

The C4 ID Series is your personalized pre-workout experience product line. With the C4 ID Series, you can pick and choose which C4 will fuel your fitness goals, because while we do share the desire to improve ourselves, we all have different bodies, different workouts and different ambitions. With the C4 ID Series, you can pick and choose the best pre-workout for you.

A Product/Experience grid is present on all C4 ID product labels. This grid expresses moderate to extreme benefits of each products’ energy, focus, pumps and endurance while calling out novel benefits such as containing creatine nitrate, being 'tingle free' and supporting weight loss.



Call our results team:



THIS PRODUCT IS ONLY INTENDED FOR HEALTHY ADULTS, 18 YEARDS OF AGE OR OLDER. Do not use if pregnant, nursing, currently taking PDE5 inhibitors or nitrates for chest pain. Do not take this product before consulting licensed, qualified, health care professional 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. This product contains caffeine and should not be used in combination with caffeine or stimulants from other sources. 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 this product continuously for more than 8 weeks. Do not use if safety seal is broken or missing. Store in a cool dry place. KEEP OUT OF REACH OF CHILDREN. This product is sold by weight, not volume. 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.


News & Updates

Sign up to get the latest on sales, new releases and more …