Updated: 01/12/2018

C4 Fat Burner Review - 5 Things You Need to Know


The results of my research into C4 Fat Burner were somewhat surprising. We decided to create one of our in-depth reviews, examining the side effects, ingredients, clinical studies and overall customer service. We also looked at hundreds of customer responses and user comments posted all over the web. Lastly, we summarized and compacted everything we found to give you the bottom line.

C4 Fat Burner Readers: Click here to find out why we're giving away samples of our product, Burn HD.

What You Need To Know

Firstly, C4 Fat Burner is manufactured by Powerlab Nutrition, and it’s claimed to be the “most advanced fat burner ever.” Moreover, this supplement is said to contain the “strongest combination of fat-burning ingredients.” The formula includes caffeine, coleus forskohlii, l-tyrosine, evodiamine, niacin, synephrine, guggul lipid extract, yohimbe bark extract, vinpocetine and Absorbtech. You simply take one capsule before breakfast and one in the early afternoon (or 30 minutes before workout). After three days, you can double the dosage. It is intended to boost metabolism and heighten energy levels.

We are not sure when C4 Fat Burner was initially released, but it is available through some online dealers, but not the official website. Furthermore, this supplement is fine for women and men alike, and it does contain some natural ingredients, but read on…

Questions About Ingredients – “Are They Safe?”

The first potential problem we found deals with C4 Fat Burner ingredients. According to our Research Editor, “The supplement contains a combination of synephrine and caffeine, which may increase your risk of side effects. When these two are combined, it can lead to increased blood pressure, fainting, jitters, nausea and more.”

One customer said, “Causes nausea, anxiety, headache, you name it. Bad stuff.”

“Made me very jittery and my heart would pound like crazy,” complained another user.

Discouraging User Reviews!

We noticed some off-putting customer reviews posted on the web for C4 Fat Burner side effects. One person commented, “Does not help with weight-loss. Definitely gives me a buzz, but no weight-loss!”

“This fat burner causes some serious side effects! Not cool! My doctor told me to stop taking it,” stated another individual.

Our intense research has proven that if there is some individual part of a weight-loss pill or diet program that is especially problematic or concerning (questionable ingredients, discouraging user reviews, low Amazon rating) the real chances of success for the long term are not good. This means if C4 Fat Burner results in a lot of negative user experiences, this could be a serious issue.

The Science – “Solid?”

At DietSpotlight, we prefer to see some solid clinical research that supports the diet product and its weight-loss claims. Sadly we did not find any real clinical studies or science that supports C4 Fat Burner. While this formula does contain caffeine to boost energy levels, there is no evidence that shows this supplement is a powerful fat burner, as claimed.

The Bottom Line – Does C4 Fat Burner Work?

Is it time to hit Amazon for a bottle? First of all, we do appreciate that C4 Fat Burner contains some natural ingredients and it is easy to purchase online. However, we have some reservations about this diet pill because it’s really not backed by any clinical studies. Moreover, we’re concerned about the ingredient combination in C4 Fat Burner, as well as the discouraging customer comments posted online.

If you’d like to get rid of some serious pounds, then we encourage you to choose a product that contains only safe ingredients, is backed by solid science and is supported by plenty of positive customer reviews and comments.

Among the best products we’ve seen this year is one called Dietspotlight Burn. Its formula is a potent blend of four key ingredients, which have been shown in documented clinical research to help elevate metabolism and increase fat loss. We can’t find any comments about unpleasant side effects and the user feedback posted on the web reveals people are seeing solid results.

The makers of Dietspotlight Burn are so satisfied with their product they’re offering a Special Trial Offer, which is a good sign.

Learn More About Burn HD »
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C4 Fat Burner

What are the side effects of C4 Fat Burner?

According to customer reviews, C4 Fat Burner side effects may include nausea, anxiety, tremors, and jitteriness.

What are the ingredients in C4 Fat Burner?

C4 Fat Burner ingredients include caffeine, coleus forskohlii, l-tyrosine, evodiamine, niacin, synephrine, guggui lipid extract, yohimbe bark extract, vinpocetine, bioperine, vanadyl sulfate, magnesium stearate, gelarine, and titanium dioxide.

How do I know if C4 Fat Burner is right for me?

Choosing the right product is the #1 question asked by DietSpotlight readers. We recommend trying any product before buying it and know that finding a product with a sample offer is near impossible - so we created our own product, Burn HD, with scientifically backed ingredients.

Click here to get your sample of our powerful fat burner today.

Does C4 Fat Burner work?

There are no clinical studies that prove C4 Fat Burner actually helps you lose weight. However, it does contain caffeine, which is clinically tested and may help suppress appetite.

How much does C4 Fat Burner cost?

C4 Fat Burner costs $29.00 for a bottle of 120 capsules.

What is C4 Fat Burner’s BBB rating?

Powerlab, the company that makes C4 Fat Burner, is not accredited by the BBB.

How should I take C4 Fat Burner?

It is suggested that consumers take one capsule before breakfast or a morning workout and one capsule before lunch or an afternoon workout. You can double the dosage after three days of consumption.

Does C4 Fat Burner target a specific area of fat?

There is no evidence that any weight-loss supplement can target a specific area of fat, and that includes C4 Fat Burner.

Do I need to exercise while on C4 Fat Burner?

While it is not required to exercise while using C4 Fat Burner, the supplement works best when you consume before a workout.

Do I need to eat healthy while on C4 Fat Burner?

You do not have to eat healthy in order to use C4 Fat Burner, but healthy eating habits are always encouraged for maximum weight-loss.

Does C4 Fat Burner come with a guarantee?

C4 Fat Burner does not come with a guarantee.

You may want to check out Dietspotlight Burn, which has clinically tested ingredients and results customers cannot get enough of.


Previous C4 Fat Burner Review (Updated September 25, 2011):

What You Should Know

C-4 Fat Burner from Powerlab Nutrition claims that it is the "most advanced fat burner ever developed." The manufacturer claims this supplement contains the strongest combination and dosage of fat burning ingredients ever.  C-4 Fat Burner promises to dramatically increase the user's energy for supercharged workouts, as well as raising the body temperature for increased metabolism even after workouts.


Synephrine, Yohimbe Bark Extract, Caffeine, Guggul Lipid Extract, Bioperine, L-Tyrosine, Coleus Forskohlii, Vinpocetine, Evodiamine, Niacin, Magnesium Stearate and Gelatin.

Product Features

Powerlab Nutrition, the company behind C-4 Fat Burner, is a well-known name in the sports nutrition industry. The C-4 Fat Burner capsules seem to be geared towards serious athletes trying to eliminate nearly all body fat.  Based on this claim, this supplement is likely not the right choice for anyone looking to shed a few pounds or jumpstart a weight loss program. Having virtually no body fat is not only an unrealistic goal but one that is not particularly safe. In fact, safety does not seem to be the highest priority with the C-4 Fat Burner. One of its ingredients is synephrine, a product which is very similar to ephedra and has been singled out for some of the same reasons as that now banned product. There are also warnings against using synephrine with caffeine, something that Powerlab overlooked with this product. If these two facts are not enough to discourage the potential user, it should be pointed out that components like yohimbe bark can cause nausea, headaches and dizziness and evodiamine is a diuretic.  C-4 Fat Burner is available at a number of vitamin and bodybuilding supplement sites online. The list price is $59.99 for 120 capsules, but some sites sell for as low as $34.99, so it is best to look around if you are still determined to try this product.


  • C-4 Fat Burner works on the principles of thermogenics.


  • C-4 Fat Burner includes a number of unsafe or untested ingredients.
  • Customer reviews for C-4 Fat Burner vary. Most reviewers say it works but give a list of side effects such as becoming too wired or too jittery.
  • There are no guarantees available for C-4 Fat Burner on any of the sites were it is available.


Powerlab's claim that C-4 can eliminate all body fat are unrealistic and not medically wise. Some of the ingredients found in C-4 raise a number of safety concerns.  There are many products on the market that aim to help the consumer lose weight. The wise and informed consumer should make every effort to find one that will first do no harm. Look especially for products that contain a fat burner and an appetite suppressant with their metabolism booster. Avoid those that have things like diuretics which give the false impression of results. It is also smart to rely on research and customer reviews to verify the claims of the manufacturer. There are products out there that work, use care to find the one that works safely for you.

Summer Banks Dietspotlight Author
About the Author:

Summer Banks, Director of Content at Dietspotlight, has researched over 5000 weight-loss programs, pills, shakes and diet plans. Previously, she managed 15 supplement brands, worked with doctors specializing in weight loss and completed coursework in nutrition at Stanford University. full bio.

5 C4 Fat Burner Reviews

  • I have thyroid
    Veer gupta

    I have thyroid can I take c4.

    • Stephen (Editor)

      You’d have to ask your doctor

  •  It isn't all in all. Take pre-workout instead before a workout and then have the proper diet and there ya go.
    Zach (Verified User)

    Honestly, you feel your body get warm and the caffeine is powerful. Definitely need to keep hydrated with this. I had lost 20 pounds in about 8 weeks while using this product, but those results are most likely due to my diet change rather than this product. It is pricey, but you definitely feel this thing working on your body. I would recommend this to someone who wants to try something different. With this in mind, I still feel like fat burner isn’t something needed to lose weight. Take pre-workout instead before a workout and then have the proper diet and there ya go.

  • Can loose weight with it?

    I have some extra time on my hands and was looking for something fun to do. If anyone has some suggestions, please lend me a hand in this thread

    ~ Thank you!

  • Gonna give it a try
    Walter H Harrison

    Gonna give it a try—I am generally a modifies Atkins follower…But it’s so hard to maintain…and can be very constipating..I hope this stuff helps me-