C4 Original is the pre-workout that made C4 famous, and it's still one of the easiest to find on a shelf. But "C4 Original" has been reformulated over the years, so it matters which tub you're holding. This review covers the current 5th Generation formula, the one with an 8.9g scoop, 200mg of caffeine and every ingredient listed with its amount.

We went through every ingredient and dose to work out what it will actually do for you, not just what the label promises.

C4 Original Review: The Quick Verdict

Overall score: 5.3/10

Here's the deal with C4 Original: it's a light, entry-level pre-workout. At one scoop you get a solid caffeine kick and a mild pump, but not much else. The ingredients that matter for pumps and strength are in there, just in smaller amounts than the research behind them.

The interesting part is what happens when you double the scoop. At two scoops it jumps to 8.0/10, which is a completely different product. The trade-off is that two scoops also means 400mg of caffeine.

Honest take: a light, entry-level C4 that mostly just wakes you up. It only starts to deliver if you double the scoop.

You'll probably like it if: you're new to pre-workouts, you're sensitive to caffeine, or you want a simple, easy-to-find option that won't blow your head off.

Maybe skip it if: you want real pumps, focus or strength from your pre-workout. At one scoop, C4 Original is too light for that.

C4 Original at a Glance

Check your tub's label for the maximum number of scoops it recommends. Some regional labels cap C4 Original at one scoop per day, so the two-scoop column shows what the formula can do, not what you should take.

What Is C4 Original (5th Gen)?

C4 Original is Cellucor's flagship pre-workout. The 5th Gen version launched in 2024 and replaced the old formula with a fully disclosed one, so you can now see exactly what's in each scoop.

Quick facts:

• You take: 1 Scoop (8.9g)
• Per tub: 30 servings
• Price: $34.99 a tub ($1.17 per serving)
• Caffeine: 200mg per scoop
• Stimulant level: Moderate

How to tell you've got the 5th Gen: the label shows PeptiPump, the amounts are all listed, and the scoop is around 9g. The older 4th Gen tubs had a smaller 6.5g scoop, 150mg of caffeine and a proprietary blend that hid several amounts, so this review doesn't apply to those.

C4 Original Energy: Will It Actually Wake You Up?

Score: 6.2/10 at one scoop

Yes, this is where C4 Original does its best work. With 200mg of caffeine, you're getting roughly two cups of coffee's worth of kick, which is a solid, noticeable lift without being overwhelming. There are no other stimulants in the formula, so what you get is plain, clean caffeine energy.

What it'll feel like: a steady, moderate kick that shows up within about 15 to 45 minutes and carries you through a normal session. It won't blow you away, but it won't leave you jittery either.

Honest take: a dependable, moderate kick. Nothing fancy, nothing excessive.

C4 Original Focus: Will You Feel Locked In?

Score: 4.2/10 at one scoop

Not really. Focus is C4 Original's weakest area, and it's mostly just the caffeine doing the work.

• Huperzine A (0.05mg): a plant compound used for focus. Research uses closer to 200mcg, so you're getting only a fraction of a real dose.
• Choline bitartrate (225mg): a basic form of choline that research hasn't shown to sharpen focus, so don't count on it.

There's no tyrosine, no theanine and no other focus ingredient to back the caffeine up.

What it'll feel like: awake and alert, but not especially dialed in. If focus matters to you, this isn't the pre-workout for it.

Honest take: you'll feel awake, not locked in.

C4 Original Pumps: Will You Look and Feel Bigger?

Score: 5.7/10 at one scoop

You'll get a mild pump. The right ingredients are here, just not in big enough amounts.

• Citrulline (1200mg): helps your body make more nitric oxide, which opens up blood vessels and sends more blood to your muscles. Research points to around 4000mg for the full effect, so this is well short.
• Arginine (1200mg): works toward the same goal, but it's absorbed poorly, so it adds less than the number suggests.
• Nitrates (312mg): these come from the creatine nitrate in the formula, and they open up blood vessels by a different route than citrulline. A big share of C4 Original's pump comes from this one ingredient.
• PeptiPump (100mg): a branded lentil peptide that helps blood vessels relax. It's a newer ingredient without much human research behind it yet, and this is a small dose of it.

There's nothing in here to help your muscles hold on to fluid, like electrolytes or taurine, which is part of why the pump stays modest.

What it'll feel like: a light pump that you'll notice mostly on higher-rep work. It's not the "skin about to burst" feeling.

Honest take: a mild pump. It needs two scoops to be worth talking about.

C4 Original Strength and Performance: Will You Lift More?

Score: 5.0/10 at one scoop

This is the weakest of the four categories, and the reason is simple: the key ingredients are all under-dosed.

• Beta-alanine (2000mg): helps your muscles handle the burn during hard sets, and it's also what causes the tingly feeling. Research uses 3.2-4.5 g a day for the full effect, and this is well below that. It also works best taken consistently, not just as a one-off.
• Creatine nitrate: this form of creatine is bonded to nitrate. You get about 688mg of actual creatine, while most studies use 5,000mg. Think of it as a small bonus, not a replacement for a creatine supplement.
• Caffeine and citrulline add a small lift too, which is about the most you can say for them at these amounts.

What it'll feel like: a slight edge on your sets, but you won't feel a big difference in your lifting.

Honest take: light on strength. It's a good wake-up call, but not a performance booster.

C4 Original Two Scoops: Does Doubling Up Help?

Overall score at two scoops: 8.0/10

This is the most interesting thing about C4 Original. Doubling the scoop doubles everything in it, and the scores jump up a lot:

• Energy: 6.2 to 8.7
• Focus: 4.2 to 7.3
• Pumps: 5.7 to 7.7
• Strength & Performance: 5.0 to 8.3

That's a big jump, but the cost is real:

• 400mg of caffeine. That's a genuinely high dose, roughly four cups of coffee in one go.
• Half as many servings. A tub drops to 15 servings, which works out to $2.33 per dose.
• Double the tingles and double the stomach load.

Honest take: it works, but at that point you're paying double per dose and taking a lot of caffeine to get there.

What Do Customers Say About C4 Original?

C4 Original gets strong feedback for its energy and its price. Reviewers call it "explosive energy" and "worth the price for the benefit," and many say it's an easy first pre-workout. At 200mg a scoop it's a moderate dose, and at about $1.17 a serving it's cheap to keep stocked.

However, customer feedback highlights three trade-offs worth knowing.

First, flavor is mostly liked, with a few misses. Fans say it has "great flavor" and "mixes with anything." Others are blunter. iHerb's review summary says some find it too sweet, one Cherry Limeade reviewer said it tastes "like taking a cough syrup," and a Vitamin Shoppe buyer said it "foams up" in the shaker and tastes "off."

Second, the recipe has changed over the years. Some long-time users say it "does not taste like Original C4 in the yellow container," while others say it "has changed over the years, but it is still great." Reviews on these pages cover older and newer versions, so not every comment describes today's 200mg formula.

Third, how hard it hits depends on your caffeine tolerance. At 200mg, some people feel a strong kick and others a mild one. Walmart's review summary says the potency "can be strong, but also inconsistent across users."

One more thing worth knowing: "no crash, no jitters" is the most repeated line, and it appears in near-identical wording across the brand-collected reviews on Target and the Vitamin Shoppe. That reads like marketing copy, so don't treat it as proof.

Honest take: C4 Original delivers a moderate, easy kick and works for most people. The complaints are about the occasional bad flavor and the changed recipe, not about whether it works. Start with one scoop.

Customer feedback is subjective and may cover different flavors or formulations. Retailer reviews are separate from our ingredient-based formula score.

C4 Original Side Effects

Tingles and pins and needles. C4 Original contains 2000mg of beta-alanine, enough that most people will notice real tingling across the face, neck and hands, starting around 15 minutes in and fading within the hour. It's harmless, and it isn't a sign the product is working any harder. Smaller people tend to feel it more at the same dose. Taking it with food or using less than a full scoop takes the edge off.

Jitters and a racing heart. At 200mg of caffeine, jitteriness and a wired, restless feeling are the most common complaints, especially if you don't drink caffeine regularly or you take it on an empty stomach. If caffeine has always hit you harder than it seems to hit other people, you may be a slow caffeine metabolizer, and the same dose will hit harder and last longer for you. Start with half a scoop the first time. At two scoops you're at 400mg, which is a genuinely high dose that can bring on real anxiety symptoms in sensitive people.

Stomach upset. C4 Original contains 1200mg of plain L-arginine, which is more prone to causing cramping or loose stools than citrulline. The amount is fairly small, so it's unlikely to bother most people at one scoop, but it adds up if you double the dose. Mixing it into more water and drinking it slowly helps.

Sleep. Give yourself at least 6 to 8 hours before bed.

Who should skip it. Anyone pregnant or breastfeeding, under 18, sensitive to stimulants, or managing blood pressure, heart or anxiety conditions should talk to a doctor before using C4 Original. The same goes if you take prescription medication, because stimulant interactions are the most common problem.

Should You Buy C4 Original?

Choose C4 Original if:

• You're new to pre-workouts or sensitive to caffeine, and 200mg is plenty.
• You want milder tingles and an easier stomach.
• You'd rather have a small scoop that mixes easily.
• You want more servings per tub (30), and you're happy with a lighter product.

Don't choose C4 Original if:

• You want real pumps, focus or strength at one scoop. It's light in all three.
• You'd need two scoops to feel anything. That means 400mg of caffeine and double the cost per dose.
• You want electrolytes in your pre-workout. There aren't any.

Beginners: start with C4 Original at one scoop (or even half). It's a gentle way in. C4 Ultimate is a lot to start with.

Training in the evening? C4 Original's lower caffeine is easier to fit in, though it will still be in your system for hours.

Need creatine in your pre-workout? Neither C4 Original (688mg) nor C4 Ultimate has a real dose. You'll want to take it separately.

Tested athlete? Neither C4 Original nor C4 Ultimate is NSF certified. Look at C4 Sport instead.

Pre-Workouts Similar to C4 Original

• Want a step up within C4? C4 Ultimate scores 7.6/10 with 300mg of caffeine, at $2.00 a serving. Read our C4 Ultimate review.
• Want the same 200mg of caffeine with a stronger formula? RYSE Godzilla scores 7.7/10 at $1.42 a serving. Read our RYSE Godzilla review.
• Want a cheaper light option? BUM Essential scores 6.1/10 with 200mg of caffeine, at $1.00 a serving. Read our BUM Essential review.
• Tested athlete? C4 Sport is NSF Certified for Sport and scores 5.3/10 at $24.99 a tub. Read our C4 Sport review.

C4 Original Quick Answers

Is C4 Original a good pre-workout? C4 Original is a decent, light pre-workout that scores 5.3/10 on our scale. It gives you a solid caffeine kick and a mild pump, but its pump, focus and strength ingredients are dosed below research levels at one scoop.

How much caffeine is in C4 Original? C4 Original contains 200mg of caffeine per scoop, which is roughly two cups of coffee. Two scoops would be 400mg.

Which version of C4 Original is this review about? This review covers the 5th Generation C4 Original, which has an 8.9g scoop, 200mg of caffeine and fully disclosed ingredient amounts. The older 4th Gen C4 Original used a smaller 6.5g scoop with 150mg of caffeine and a proprietary blend.

Does C4 Original have creatine? C4 Original contains creatine in the form of creatine nitrate, but only about 688mg of actual creatine per scoop. That's well below the 5,000mg used in most studies, so you'd need to take creatine separately for the full benefit.

Does C4 Original have beta-alanine, and why do I tingle? C4 Original contains 2000mg of beta-alanine per scoop, well short of the 3.2-4.5 g range used in research. The tingling is a harmless pins-and-needles feeling caused by the beta-alanine, and it usually fades within the hour.

Is C4 Original a high-stim pre-workout? C4 Original is a Moderate-stimulant pre-workout. It contains 200mg of caffeine, roughly two cups of coffee, and no other stimulants.

Does C4 Original have citrulline? C4 Original contains 1200mg of citrulline per scoop, which is under the 4000mg that research points to for the full pump effect.

How many scoops of C4 Original should I take? Start with one scoop of C4 Original, or even half if you're sensitive to caffeine. Two scoops raises its score to 8.0/10 but also doubles the caffeine to 400mg, so check your tub's label for its maximum and only step up if you tolerate it well.

Is C4 Original good for beginners? C4 Original is good for beginners, because it contains a moderate 200mg of caffeine and no other stimulants. Start with one scoop, or even half if you're sensitive to caffeine.

Does C4 Original taste good? C4 Original tastes good to most reviewers, though flavor is subjective. They describe its flavors as "great" and say it "mixes with anything," but a few say Cherry Limeade tastes "like taking a cough syrup" and one found it "foams up" and tastes "off." Long-time users also say the current C4 Original doesn't taste like the older yellow tub.

Is C4 Original NSF certified? C4 Original is not sold as NSF Certified for Sport. Cellucor's NSF certification is on a different product, C4 Sport, so tested athletes should look there instead.

Is C4 Original or C4 Ultimate better? C4 Ultimate is better than C4 Original on our scores, with an overall 7.6/10 against 5.3/10 for C4 Original at one scoop. See our C4 Original vs C4 Ultimate comparison for the full breakdown.