Updated: 01/11/2018

Diet Fuel Review - 6 Things You Need to Know


Well over half of weight-loss products out there have absolutely ZERO scientific backing. Let’s see if Diet Fuel is one of those. We conducted a detailed review, examining the ingredients, side effects, overall customer service and clinical studies. Plus we sorted through countless user reviews and dieter responses posted online. Finally, we summarized all the facts to give you the bottom line.

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

What is Diet Fuel?

To start off, Diet Fuel is an over-the-counter dietary supplement. The ingredients are green tea leaf, raspberry ketones, caffeine anhydrous, guggulsterones, green coffee, kelp, dendrobium noble stem extract, fucus nodosus, capsimax, citrus aurantium, dulse powder, nettle root, bioperine, diiodotyrosine and brassica campestris root extract. You’ll take 1-2 capsules per day. It aims to burn off fat, suppress appetite, boost energy levels and increase thermogenesis.

TwinLab, founded in 1968, released Diet Fuel in 2013. The official website and trusted retailers sell the supplement. We like that it contains some natural ingredients and seems affordable, but read on…

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Ineffective – “Weight Loss or Increased Energy?”

Our first concern was with Diet Fuel ingredients. “While examining the label, we noticed that this weight-loss aid contains fad elements such as raspberry ketones, which have not been clinically proven to assist with fat loss,” said our Research Editor. “This may be part of the reason dieters are not reporting the results they wanted to see.”

One customer said, “Slight boost in energy, nothing special.”

Another stated, “Did absolutely nothing for weight loss. Not buying again!”

Diet Fuel Reviews – “Customer Complaints?”

There are definitely a number of customer complaints regarding Diet Fuel. In fact, one user said, “Not for me. Made me vomit and break out. I threw them away.”

Another complained, “It did not work for me. Too intense and made me sick to my stomach a lot of the time.”

Our research has shown that if a specific facet of a weight-loss pill is especially burdensome (side effects, too many customer complaints, fad ingredients) the probability of success for the long-term is pretty low. So, if Diet Fuel does lead to a lot of consumer issues, this could be problematic.

The Science – “Any Validity?”

We couldn’t find any documented science listed on the official website supporting Diet Fuel as an effective weight-loss product. Green tea and caffeine have been the subject of such research with some positive results, but you can buy these online for less than $5 a bottle. There are also studies on ingredients like citrus aurantium showing some negative side effects like increased heart rate and elevated blood pressure, especially when taken with a stimulant. We at DietSpotlight have to see published proof supporting the product. Unfortunately there is nothing backing claims made about Diet Fuel.

What Users Are Saying

“”These have been a long time favorite of mine to get rid of that unwanted water. Especially good after high-salt meals like pizza. I cycle on for a month then off so not to damage my liver. Highly recommend!””

“”This compound is slightly less effective than their previous offerings. Still feel like it gives energy though.””

“”It did not burn any fat from my body.. MY body weight remains still the same as it was 6 months before. I weigh arround 205lb and I am 180 cms. I wantted a weigh arround 170 so I work out daily, then I heard of this product and tried using it and it never gave me any good results. I still have those fats arround my abdoman.””

The Bottom Line – Does Diet Fuel Work?

Alrighty then, what did our detailed look into Diet Fuel reveal? It’s always nice to see a weight-loss product that uses natural ingredients, but we are hesitant to suggest you use it. Aside from the fact that this supplement is not supported by clinical studies, it appears to have been discontinued as well. We’re also concerned that synephrine may be associated with some potentially negative side effects.

If you’d really like to shed more pounds and slim down quickly, we suggest you try out a supplement that contains ingredients that are supported by clinical studies with no reported side effects. Customer reviews are also a huge part of the equation with positive experiences being the same as a green light.

Among the best products we’ve seen this year is one called Burn HD. Its formula is a blend of four key ingredients, which have been proven in documented scientific studies to help increase fat loss and elevate metabolism. Moreover, we didn’t find any discussion of harmful side effects and user comments posted on the internet indicate people are seeing amazing results.

Also, the company behind Burn HD are so confident in the ingredients that they’re offering a 2-Week Sample, a nice surprise.

Learn More About Burn HD »
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Diet Fuel

What are the side effects of Diet Fuel?

Some potential side effects of Diet Fuel include jitteriness, nausea, increased heart rate and sleeplessness.

What are the ingredients in Diet Fuel?

Diet Fuel ingredients are green tea leaf, caffeine, raspberry ketone, gum guggul resin, green coffee fruit, camellia sinensis leaf, loranthus parasiticus stem, polygonum multiflorum root, kelp, dendrobium nobile stem, fucus nodosus, capsicum annuum fruit, citrus aurantium fruit, dulse powder, nettle root, brassica campestris, piper nigrum fruit, diiodotyrosine, gelatin, microcrystalline cellulose, magnesium stearate and silicon dioxide.

How do I know if Diet Fuel 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 Diet Fuel work?

There’s no scientific research proving Diet Fuel is effective. We found research supporting weight-loss claims of caffeine and green tea, but not linked to this particular formula.

How much does Diet Fuel cost?

Diet Fuel costs $12.45.

How should I take Diet Fuel?

You should take two Diet Fuel capsules per day. The company recommends using one to test your tolerance and warns not to take more than one serving, two pills, in a 24-hour period. One bottle lasts a little more than 30 days.

Are the raspberry ketones in Diet Fuel clinically proven effective?

No, the raspberry ketones in Diet Fuel isn’t supported by clinical research. The ingredient is often considered a ͞fad ingredient.

What is the amount of caffeine in Diet Fuel?

There’s no mention of the amount of caffeine in Diet Fuel.

Does Diet Fuel come with a guarantee?

Diet Fuel doesn’t come with a guarantee. The product is only through online retailers.

You may want to consider changing things up and substituting Diet Fuel with a supplement like Dietspotlight Burn, which contains ingredients clinically proven to work.


Previous Diet Fuel Review (Updated April 2, 2014):

What You Should Know

It is prudent to investigate any diet product prior to taking it for weight reduction purposes, or any other reason. One issue that constantly arises is ingredient safety. If you are not aware of Ephedra (also called Ephedrine), then you should know that it is not legal in the US. Therefore you do not want a diet product containing this substance. One weight loss product that we are going to scrutinize at this point is Diet Fuel by TwinLab. How would you like to have more energy, lose unwanted pounds, and feel great? This is what Diet Fuel is supposed to do for users. It contains the ingredient Green Tea Extract, just like many other weight loss products nowadays. This is a form of caffeine, which is claimed to boost energy levels. However, you should know that caffeine is a diuretic that pulls water off of the body.

List of Ingredients

Guarana Seed Extract 800mg, Thermogenic Energy Enhanced Complex 685mg, Citrus Aurantium Fruit Extract, St John’s Wort Extract, L Phenylalanine, Green Tea Leaf Extract, Quercetin, Citrus Bioflavonoid Complex, Ginger Root, Cayenne Fruit, Gelatin, Purified Water, MCT Silica, and Magnesium Stearate.

Product Features

Diet Fuel is one of the several dietary supplements offered by TwinLab. This product in particular is supposed to aid users with weight reduction. It sells for a retail price of $39, which amounts to 120 capsules. Along the lines of many other weight loss formulas available, this supplement is to be taken prior to each major meal of the day. While two capsules should be taken each time, the user should not exceed six capsules of Diet Fuel in one day. There are a number of warnings that should be examined prior to taking this weight loss formula. Some health concerns that restrict certain individuals from taking Diet Fuel are as follows; liver disease, thyroid problems, pernicious anemia, depression, nervousness, prostate enlargement, and diabetes. Women who are nursing or pregnant cannot take this diet product. There are not many reviews presented online for Diet Fuel capsules, and some of them are not positive.


  • A full list of ingredients are presented for this weight loss supplement.
  • It is easy to find Diet Fuel on sites like drugstore.com.


  • There is no scientific research presented to support Diet Fuel.
  • This weight loss formula has a lot of warnings, which may turn some dieters away.
  • Some of the reviews for Diet Fuel are not positive.


When all is said and done, there is really not a lot supporting Diet Fuel as a stellar and effective weight loss product. First of all, some reviews posted online for this supplement are negative, which is something to keep in mind. Secondly, Diet Fuel contains caffeine, which is a known diuretic that may lead to nervousness and jitters. Be sure to compare Diet Fuel to some other weight loss products before choosing to buy it.
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.

16 Diet Fuel Reviews

  • Does this really give you weight loss?

    Does this realy give.u weight loss

    • Your Name

      Yes I have lost 12 lbs and haven’t exercised a bit

      • Jason

        Does it make you go a lot to the bathroom?

    • Maribel (Editor)

      Hello Amy. All users are different and can experience different weight-loss results.

  •  New Formulation does not work !
    Ilspeth (Verified User)

    The Original Twinlab Diet Fuel was phenomenal. It worked. But you can’t buy it anymore because so many people took it irresponsibly. There were a lot of products on the market then that contained the ECA stack, and they worked. But every new formulation of Diet Fuel since then has been garbage, IMO. What’s really interesting is that the old formulation of Diet Fuel that worked only cost about $15 / bottle. They reformulated it into a product that doesn’t work, and jacked up the price.

    • Jackie

      So true!!! Do you know were can be purchased?

      • Maribel (Editor)

        Hi Jackie, we are not affiliated with the company and do not sell this product.

  • Can anybody suggest like original ?
    Katarena (Verified User)

    My husband swore by the original diet fuel , can anybody suggest anything that is like the original . We have tried many products over the years nothing has come close .

    • Stephen (Editor)

      If you’re looking for an alternative click here to see a proven product that might interest you.

    • Your Name


  •  no side affects
    Shiloh (Verified User)

    The original Diet Fuel did work. I took it for years with no side affects. The original contained Chromium Picolinate, MaHuang Extract(ephedra), Guarana Seed Extract, Garcinia Cambogia. Directions was to take as much as 2 three times a day, but I only needed 1 every 4 hrs. Back then, I worked up to 72 hrs a week, and it kept me going. Also, back then, energy drinks weren’t around. I seem to remember that the first Diet Fuel also had a little Taurine in it, too, but I may be wrong. I bought it for $22. The price now is ridiculously high, and doesn’t do what it purports. NOT worth the price. I take a small amt of Taurine, Guarana, Garcinia Camogia. I take just a very little of each. I’m thinking of saving my money on the GC

    • Sage

      You are right. I lose great weight with exercise and had more energy. Why did they change the product? Better yet what is on the market that is equivalent to the old ingredients?

      • Stephen (Editor)

        Difficult to say because at this time. Some of the ingredients may have been taken off the market entirely, sage.

        • ilspeth

          You can still buy the ingredients in the ECA stack. Many body builders make their own stack, buying ephedra, caffeine and aspirin separately.

          • Stephen (Editor)

            Right, but ephedra is not legal in the US anymore.

  • It was really informative
    Travis Hall

    Everything is very open with a precise description of the issues. It was really informative. Your site is very useful. Thank you for sharing.