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Diet Fuel Review - 6 Things You Need to Know

Diet Fuel is a diet supplement you can buy over-the-counter that is supposedly formulated to help curb your appetite, boost your metabolism and raise your level of thermogenesis. TwinLab, the manufacturers of Diet Fuel, say that their unique formula will help support weight loss with its clinically tested green tea extract and chromium ingredients. However, their website doesn’t contain any real information about these “clinical trials.”

There was also the issue of the ingredient list which doesn’t contain much in it that would help with weight loss outside of the green tea extract and caffeine. Our research team wanted to know if chromium was an ingredient commonly used in weight loss products and if there were any negative side effects of taking Diet Fuel. These are the results of our study.

Diet Fuel can be purchased through their Official Site.

Diet Fuel Readers: Noom is offering our readers a free trial, for a limited time. Click here for this special offer!

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 nobile 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, an MLM company founded in 1968, released Diet Fuel in 2013. However, Diet Fuel was discontinued and is no longer for sale. We like that it contains some natural ingredients and seems affordable, but read on…

Diet Fuel Competitors

Whey Protein
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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!”

User Complaints

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, 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

“Love it!”

“I did not find this product helpful in losing weight.”

“Waste of money.”

Bottom Line

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 program supported by clinical studies. 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 Noom. The clinical research proves Noom works to help users lose weight and maintain the weight loss. User reviews show amazing results. There’s nothing to lose but those extra pounds.

Also, the company behind Noom is so confident in the weight-loss app that they’re offering a free trial, a nice surprise.

Learn More About Noom »
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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.

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.

Where can I buy Diet Fuel?

Diet Fuel can be purchased using their Official Site.

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.

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 Purchase)

    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 Purchase)

    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 Purchase)

    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.