C4 and Celsius are both caffeinated energy drinks, but their formulas are not identical. The biggest differences are serving size, caffeine concentration, beta-alanine, ingredients, and product positioning.

For this comparison, C4 means C4 Performance Energy, while Celsius means the standard CELSIUS energy drink. Both brands sell other products, so the exact product matters.

C4 vs Celsius at a Glance

Feature	C4 Performance Energy	Standard CELSIUS
Serving size	16 fl oz	12 fl oz
Caffeine	200 mg	200 mg
Sugar	0 g	0 g
Calories	10	10
Main distinction	Includes CarnoSyn® beta-alanine	Different vitamin/plant-extract formulation
Format	Ready-to-drink can	Ready-to-drink can

Current C4 Performance Energy information lists 200 mg caffeine, 0 g sugar and 10 calories per 16-oz can. (GNC)

CELSIUS states that its standard CELSIUS and CELSIUS Vibe products contain 200 mg caffeine per can. (CELSIUS)

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C4 vs Celsius: Which Has More Caffeine?

For the specific products compared, both contain 200 mg caffeine per can.

C4 Performance Energy: 200 mg

Standard CELSIUS: 200 mg

(GNC)

Caffeine winner: Tie

The serving sizes are different, however.

C4 provides 200 mg in 16 fl oz.

Celsius provides 200 mg in 12 fl oz.

That means the caffeine concentration per fluid ounce is different:

C4: 12.5 mg/oz

Celsius: approximately 16.7 mg/oz

That is simply a mathematical comparison of the labeled amounts. It does not establish that one product produces a stronger subjective effect for every person.

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C4 vs Celsius: Sugar

Both standard products compared here contain zero sugar.

C4 Performance Energy lists 0 g total sugar and 0 g added sugar. (GNC)

CELSIUS identifies its energy drinks as having no sugar. (CELSIUS)

Sugar winner: Tie

Neither has an advantage on sugar in this particular comparison.

Zero sugar also does not automatically mean an energy drink is appropriate for everyone.

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C4 vs Celsius: Calories

Both products provide approximately 10 calories per serving in the formulations compared.

C4 Performance Energy lists 10 calories per 16-oz can. (GNC)

Current CELSIUS product information lists standard energy drinks at about 10 calories per can. (CELSIUS)

Calorie winner: Tie

There is no meaningful calorie advantage between these specific standard products.

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C4 vs Celsius: Beta-Alanine

This is one of the most notable differences.

C4 Performance Energy includes CarnoSyn® beta-alanine. Its current product information specifically identifies CarnoSyn beta-alanine as part of the formula. (GNC)

Current C4 product information describes the formula as providing CarnoSyn beta-alanine alongside 200 mg caffeine. (GNC)

Beta-alanine winner: C4

C4 has a clear formulation distinction here.

That doesn’t mean every person needs beta-alanine or that C4 is automatically the better energy drink.

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C4 vs Celsius: Ingredients

C4 Performance Energy’s current ingredient information includes ingredients such as CarnoSyn beta-alanine, BetaPower betaine, caffeine, potassium citrate, sucralose and acesulfame potassium, along with other ingredients. (GNC)

CELSIUS describes its standard energy drinks as containing caffeine along with ingredients such as green tea extract, guarana and vitamins. (CELSIUS)

The formulas are therefore different.

An ingredient list alone does not prove that one product is universally healthier or more effective.

Ingredient takeaway

C4: performance-oriented formula that includes beta-alanine.

Celsius: caffeine plus its own vitamin and plant-extract formulation.

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C4 vs Celsius: Vitamins

Both products contain vitamins, although their formulas are different.

The current C4 label used for this comparison lists vitamin B12 among its declared nutrients. (GNC)

Celsius identifies multiple vitamins in its standard energy-drink formulation, including B vitamins and vitamin C depending on the product. (CELSIUS)

There is no useful reason to declare one brand the universal “vitamin winner” without defining exactly which nutrient and product are being compared.

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C4 vs Celsius: Caffeine per Ounce

Because the cans have different serving sizes, this is a useful calculation.

C4

200 mg ÷ 16 oz = 12.5 mg/oz

Celsius

200 mg ÷ 12 oz = 16.7 mg/oz

Caffeine concentration: Celsius

Celsius has the greater caffeine concentration by volume in this comparison.

But both cans contain the same 200 mg total caffeine.

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C4 vs Celsius for Workouts

C4 Performance Energy is specifically formulated with CarnoSyn beta-alanine and 200 mg caffeine. (GNC)

Celsius also markets its standard energy drinks toward active lifestyles and exercise. (CELSIUS)

That does not create a universal workout winner.

Recommendation

C4 may be the more relevant choice if you specifically want beta-alanine in your energy drink.

Celsius may be the better fit if you prefer its formulation and 12-oz format.

Neither should automatically be treated as a replacement for water or a dedicated electrolyte product.

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C4 vs Celsius for Studying

Both standard products provide 200 mg caffeine per can. (GNC)

So caffeine amount does not distinguish them in this comparison.

Recommendation

Choose based on:

• The amount of caffeine you want
• Serving size
• Ingredients
• Flavor preference
• Your individual response to caffeine

There is no evidence here that one is universally better for studying.

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C4 vs Celsius for Work

The same basic comparison applies to work.

Both provide 200 mg caffeine.

C4 includes beta-alanine, while Celsius has a different ingredient and vitamin profile. (GNC)

Recommendation

There is no objective universal winner.

The more useful question is which formulation fits your preferences and caffeine needs.

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C4 vs Celsius: Which Is Better for Zero Sugar?

For these specific standard products:

C4: 0 g sugar

Celsius: 0 g sugar

Winner: Tie

Both satisfy a zero-sugar preference based on their cited product information. (GNC)

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C4 vs Celsius: Taste

Taste is subjective.

Both brands offer multiple flavors, and individual preferences differ.

Without a controlled blind taste test, there is no objective basis for saying one brand universally tastes better.

Taste winner

Personal preference.

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C4 vs Celsius: Product Lines Matter

This is important when comparing Celsius.

Current CELSIUS information lists:

• CELSIUS and CELSIUS Vibe: 200 mg caffeine
• CELSIUS Essentials: 270 mg
• CELSIUS On-The-Go: 200 mg
• CELSIUS Hydration: no caffeine. (CELSIUS)

So the word “Celsius” does not always mean a 200-mg caffeinated beverage.

C4 also has multiple product categories, so the exact C4 formulation should be identified before comparing labels.

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C4 vs Celsius: Caffeine and Safety

Both products in this comparison provide 200 mg caffeine per serving.

Celsius notes that two standard 12-oz cans provide 400 mg caffeine and cites the FDA’s commonly referenced 400-mg daily amount for most adults, while also noting that caffeine sensitivity varies. (CELSIUS)

That 400 mg figure should not be treated as a personal target.

Total caffeine intake includes other sources such as:

• Coffee
• Tea
• Soda
• Supplements
• Other energy drinks

C4’s current product information also carries warnings including that the product is intended for adults and should not be consumed during pregnancy or nursing. (GNC)

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C4 vs Celsius: Quick Decision Guide

Your priority	Better starting point
Caffeine per can	Tie
Zero sugar	Tie
Calories	Tie
Caffeine concentration per ounce	Celsius
Beta-alanine	C4
16-oz serving	C4
12-oz serving	Celsius
Studying/work	Depends on preference
Workout use	Depends on exact goal
Taste	Personal preference
Overall	Depends on your priority

Final Verdict: C4 vs Celsius

C4 and Celsius are surprisingly similar on some basic nutrition points.

For the specific products compared:

Both provide 200 mg caffeine.

Both contain zero sugar.

Both contain about 10 calories.

The more meaningful differences are serving size, caffeine concentration and formulation.

C4 Performance Energy is a 16-oz energy drink containing 200 mg caffeine, zero sugar and CarnoSyn beta-alanine. (GNC)

Standard CELSIUS is a 12-oz energy drink containing 200 mg caffeine, with its own vitamin and plant-extract formulation. (CELSIUS)

So:

Choose C4 if CarnoSyn beta-alanine is an important part of the formula you want.

Choose Celsius if you prefer its 12-oz format and its particular ingredient and vitamin profile.

For caffeine, sugar and calories, these specific products are essentially tied per can.

There is no evidence-based reason to declare either product universally healthier or universally more effective. The better comparison is always the exact product, serving size, caffeine amount, ingredients and your reason for using it.