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Best Thermogenic Fat Burners [Updated 2024]


Fat Burners Reviewed


Hours of Research


Reviews Examined


Experts Interviewed

A Lean Life Editor David

Published by David Williams

As an engineer, David loves technical product comparison and analyzing the data to assess top products.

The best thermogenic fat burners work to raise your internal body temperature and boost fat oxidation and metabolism. This ensures you keep burning fat and losing weight, regardless of your diet or workout plan. This has made them one of the most popular types of weight loss supplements.

However, when it comes to choosing which thermogenic fat burner to use, it can be quite a difficult decision. Not only do thermogenic fat burners all have their own levels of potency, but many will also use extra ingredients to provide additional weight loss benefits as well.

With that in mind, we have created a list of the best thermogenic fat burner supplements that are currently on the market. This will ensure that you can find the best fat burner for you, no matter what help you may need on your weight loss journey.

And let’s be clear on one important point before jumping into our list. It’s always necessary to have a solid diet and exercise plan when losing weight. And then taking a top-rated fat burner will put your plan on rocket fuel. But you can’t take a fat burner and eat three chocolate cakes a day, and still expect to cut weight. If only it were that easy!

Let’s jump in…

Best Thermogenic Fat Burners in 2024

Table of Contents

The Best Thermogenic Fat Burner Supplements - Instant Knockout Cut

Instant Knockout Cut

Ingredient Quality

Appetite Control



Overall Score

The Best Thermogenic Fat Burner Supplements - Hourglass Fit

Hourglass Fit

Ingredient Quality

Appetite Control



Overall Score

Hunter Burn - Best Fat Burner

Hunter Burn

Ingredient Quality

Appetite Control



Overall Score


1 - Best Thermogenic Fat Burner Overall - Instant Knockout Cut

Instant Knockout CutInstant Knockout Cut is a thermogenic fat burner that was carefully designed to help MMA fighters burn stubborn belly fat. This means it has to be both very powerful and not contain any banned substances.

The Instant Knockout Cut formula uses multiple thermogenic ingredients, including cayenne pepper seeds, black pepper extract, green tea extract, and caffeine. These are then supported by glucomannan, L-theanine, vitamin B6, vitamin B12, and vitamin D3.

Beyond their thermogenic capabilities, caffeine and green tea extract will boost energy levels, digestion, and metabolism, allowing you to make better use of the nutrients in your food and train harder to burn fat even faster.

Green tea will also keep you healthy and stop you having any issues with your gut. The amino acid L-theanine then helps you to avoid the crashes commonly caused by stimulants and promotes good quality sleep, allowing your body to recover and progress quickly.

Glucomannan is used to add appetite suppression as it contains almost no calories and absorbs water and swells in your gut, which stops you consuming more calories than you need. It also slows digestion, ensuring all food is properly digested and the nutrients used effectively.

Finally, the vitamins will offer many health benefits like lowering blood pressure and boosting mood and focus, all of which will aid your exercise performance. Meanwhile, the black pepper extract will enhance the absorption and effects of the other ingredients in the supplement.

Add in the fact that Instant Knockout Cut fat burning pills contain no artificial substances, gluten, or animal products, cause no side effects, and are very affordable, and it is comfortably the best thermogenic fat burner for the vast majority of people.

Brand Overview

Instant Knockout Cut is a product of Roar Ambition, a leading sports nutrition company. While Roar Ambition has been in business since 2012, Instant Knockout launched in 2014 and has become one of the most popular fat-burning supplements on the market.

Roar Ambition is at the top of sports and health nutrition thanks to its exceptional team of nutritionists, scientists, and fitness professionals who conduct thorough research and testing to ensure product quality and safety.

Highlighted Features

  • 45mcg (1800 IU) Vitamin D3 per serving
  • 100mg L-Theanine
  • 10mg Black pepper extract
  • 300mg Caffeine Anhydrous
  • 100mg Cayenne Powder
  • 1800mg Glucomannan
  • 10mcg Vitamin B12
  • 30 servings per container
  • 500 mg Green Tea Extract
  • 5mg Vitamin B6

Benefits of Thermogenic Fat Burners

Thermogenic Fat Burner Ingredients

Formula Review

Instant Knockout Cut is a leading thermogenic fat burner that has helped thousands of men and women achieve their fat loss goals.

Instant Knockout Cut adheres strictly to CGMP guidelines. It contains no banned stimulants, making it safe and ideal for use by athletic populations. It optimally combines clinically dosed ingredients to crank up metabolism, burn fat, control appetite, and provide clean energy—all without relying on synthetic ingredients.

  • Green tea extract contains potent antioxidants and caffeine. Studies show green tea can increase fat oxidation and calorie burn.
  • Caffeine anhydrous has an energizing effect. Caffeine is a scientifically validated ingredient for boosting metabolism and fat burning. Instant Knockout Cut uses just the right amount to get results without side effects like jitters.
  • Black pepper extract, which contains piperine, helps increase the absorption of other ingredients like green tea. It also gently heats the body to burn more calories.

Rounding out the powerful formula is ginger extract for reduced inflammation, turmeric to support detoxification, and cayenne pepper to raise calorie burn. The formula is also hypoallergenic and made in FDA-approved facilities to ensure safety and quality.

Thermogenic Fat Burners



Customer Reviews / Social Proof

Instant Knockout Cut has overwhelmingly positive reviews from customers. People praise its powerful yet balanced and gentle formula for reducing appetite and boosting energy levels. Many note how it accelerates fat loss without harsh stimulants. Users also like that it suppresses cravings and keeps them feeling full.

One satisfied customer, Richard, says, “Great fat burner, but be careful; I took these with a low-calorie diet and exercise and lost 30 pounds in 3 months. Stopped taking them to stabilize weight.

The lack of jitters and side effects provides a high degree of satisfaction. Whether losing a few pounds or preparing for an event, customers report excellent results with regular use of Instant Knockout Cut to burn fat and meet their fitness goals.

2 - Best Thermogenic Fat Burner For Women - Hourglass Fit

Hourglass FitHourglass Fit is designed to stimulate fat burning while taking the needs of the female body into account. It is created using a formula containing Capsimax cayenne pepper, Bioperine black pepper, glucomannan, 5-HTP, chromium, vitamin B2, vitamin B6, vitamin B12, and zinc.

Bioperine and Capsimax are the ingredients that stimulate thermogenesis and promote fat burning directly, while also enhancing the bioavailability of the other ingredients. (1)

The vitamins and minerals then boost your energy, mood, focus, motivation, recovery, and overall health, while reducing inflammation, to ensure your workouts are consistent and effective.

5-HTP, chromium, and glucomannan are all appetite suppressants that work in different ways.

5-htp increases serotonin production to make you feel happy and satiated, while glucomannan is low in calories and swells in the gut to physically fill you up and stop you over eating. (2)

Chromium also suppresses your appetite mentally, while optimising your blood sugar levels and nutrient absorption, and further improving focus. It essentially increases the effects of all of the other ingredients in the formula. (3)

By suppressing appetite, boosting workout performance, and keeping you healthy, all while directly increasing fat burning, Hourglass Fit fat burning pills promote healthy weight loss from all angles, giving women the best chance possible to achieve their goal body composition.

Brand Overview

Hourglass Fit has established itself as a leader in the women’s health and fitness supplements market. Launched in 2014 by Roar Ambition, the company aimed to develop high-quality, research-backed products specifically formulated to help women meet their fitness and body composition goals.

All Hourglass Fit products are manufactured at CGMP-certified facilities and contain only the highest quality, clinically studied ingredients. The company puts a strong emphasis on product research and development, sparing no expense to prove supplement efficacy through internal testing and third-party clinical trials.

Highlighted Features

  • 150mg 5-HTP
  • 1.1mg Vitamin B2
  • 3000mg Konjac root extract
  • 5mg black pepper extract
  • 2.4μg Vitamin B12
  • 30 servings per container
  • 100mg Cayenne pepper extract
  • 125μg Chromium
  • 8 mg Zinc
  • 1.7mg Vitamin B6 per serving

Formula Review

Hourglass Fit contains a powerful proprietary blend designed to maximize fat-burning and thermogenesis. At the core are Capsimax cayenne pepper and Bioperine black pepper extract.

  • Capsimax contains capsaicinoids, the compounds that give chili peppers their heat. Capsaicinoids increase metabolic rate and stimulate fat cell oxidation.
  • Bioperine from black pepper increases the absorption of other ingredients by increasing bioavailability.
  • Glucomannan, a soluble fiber extracted from konjac root, is included to help curb appetite and slow gastric emptying to make you feel full longer.

The supplement also has 5-HTP, which supports healthy mood and serotonin levels that have been shown to impact appetite regulation and cravings.

Rounding out the potent thermogenic formula is chromium, which helps blood sugar regulation. It has vitamin B2 for energy production from fat-burning vitamins B6 and B12 to support metabolism and energy levels. It also has zinc, which supports healthy thyroid function and is crucial for metabolism.

The highly balanced blend in Hourglass Fit provides multiple mechanisms for igniting fat loss, boosting metabolism, and curbing appetite.



Customer Reviews / Social Proof

As a top-rated thermogenic supplement, Hourglass Fit has received reviews from many satisfied customers. Women praise its ability to burn fat without caffeine jitters. Many note significantly reduced appetites and more energy for workouts. Customers consistently report losing one to two pounds per week and inches off their waistline while taking Hourglass Fit as directed.

One customer named Megan says, “This works well, but I want to make sure you know that this isn’t a miracle-working pill. You have to take it with exercise and a proper diet to see any results at all! Once I gave up soda and fast food and started working out, I saw a massive difference using this!

Overall, reviews agree this is one of the most effective fat burners for women that noticeably boosts metabolism and unleashes stored body fat.

3 - Best Thermogenic Fat Burner For Suppressing Appetite - Hunter Burn

Hunter BurnHunter Burn is an ideal choice for people who are seeking a weight loss supplement that prioritises appetite suppression as its primary function but is also a thermogenic fat burner.

It directly stimulates weight loss by using cayenne pepper, green tea extract, and vitamin d3. These will not only raise your body temperature but also offer additional health benefits, like boosting your energy levels and reducing inflammation, to ensure you never miss a workout.

Glucomannan and white kidney bean extract then help to stop you gaining weight.

White kidney bean extract does this by blocking the carbohydrates from the foods you eat in your diet from being absorbed, while glucomannan swells in your stomach to fill you up and curb your appetite, preventing you from over eating.

Finally, the amino acid l-theanine improves your energy levels, focus, immunity, relaxation, and sleep quality, relieving anxiety and stress. This will boost your workout performance and accelerate both your mental and physical recovery, to ensure you never miss a session.

So, while Hunter Burn weight loss pills aren’t among the most potent thermogenic fat burners around, they are an ideal choice for people who want to stimulate fat burning while getting their appetite under control, to ensure they can stick to a healthy diet and calorie intake.

Brand Overview

Hunter Burn is manufactured by Roar Ambition but is marketed under their brand, Hunter Evolve. Roar Ambition aims to develop effective, science-backed supplements that enhance physical performance and support weight management goals.

For over a decade, Hunter Burn has earned a strong reputation for producing high-quality, rigorously tested supplements. Roar Ambition works closely with sports science experts and universities to identify the most effective herbal extracts and nutrient combinations. Each ingredient and dosage in Hunter Burn has been chosen based on extensive research into thermogenesis and appetite control.

Highlighted Features

  • 200mg matcha green tea
  • 3000mg Konjac root extract (glucomannan)
  • 30 servings per container
  • 3000 IU Vitamin D3
  • 125mg cayenne pepper
  • 500mg White kidney bean
  • 200mg L-Theanine

Formula Review

Hunter Burn utilizes a powerful yet comprehensive formula to suppress appetite and boost metabolism.

  • Matcha green tea provides a surge of energy with less jittery effects thanks to its high amounts of L-theanine. The L-theanine calms the caffeinated stimulus of the matcha for a smoother energy boost.
  • Cayenne pepper supercharges thermogenesis through capsaicin, raising body heat and fat oxidation.
  • White kidney beans prevent carbohydrates from being digested and turned into body fat.
  • Konjac root extract (glucomannan) is a soluble fiber that expands in the stomach to promote feelings of fullness for hours.
  • Vitamin D3 supports healthy metabolic function and may aid fat loss. Vitamin D is a crucial nutrient that most people are deficient in. The generous dosage provides optimal daily levels.

These specially selected ingredients work synergistically to control hunger cravings and increase calorie burn through multiple mechanisms. With consistent use, Hunter Burn provides effective appetite suppression for sustainable weight management.



Customer Reviews / Social Proof

Hunter Burn receives rave reviews from customers looking to suppress their appetite and boost their fat burn. One user notes, “I’m surprised by how effective it is at curbing cravings and unwanted snacking throughout the day!

People enjoy the energy and focus it provides without any jittery or crash-like feelings later on.

The clinically dosed ingredients allow them to feel full for longer and think less about their next meal. Whether looking to lose a few pounds or get through a weight loss plateau, customers find Hunter Burn helps them stay on track with their diet and exercise routine to get real results they can see and feel.

4 - Best Thermogenic Fat Burner For People On A Budget - Jacked Factory Burn XT

The Best Thermogenic Fat Burner Supplements - Jacked Factory Burn XTJacked Factory Burn XT is a weight loss supplement made using almost solely thermogenic fat burner ingredients. It includes BioPerine black pepper extract, caffeine anhydrous, Capsimax cayenne pepper extract, and green tea extract, as well as acetyl l-carnitine HCI.

The caffeine, BioPerine, Capsimax, and green tea extract will all work to help you burn more calories and fat directly, which will make sure that you continue to lose weight, even on the days when you are not as strict with your diet or workout as you should be.

The caffeine and green tea will also make you more energetic and allow you to train harder, so that you burn even more calories and maintain muscle mass while you are losing weight. The black pepper extract then makes all of these effects much more potent.

Finally, the acetyl l-carnitine HCI is included for suppressing appetite, to make it easier for you to stick to a healthy diet and avoid weight gain as you try to burn fat. (4)

This combination makes it the perfect supplement to help you lose weight from all angles, while the low price means it’s a weight loss pill that can be obtainable for all.

Admittedly, many of its fat burning ingredients are present in doses that are far lower than ideal for optimal weight reduction. However, if you are shopping on a tight budget and need a little help burning fat, then Jacked Factory Burn XT fat burning pills could be a good way to go.

Brand Overview

Jacked Factory is a leading sports nutrition brand founded in 2006 with a mission to formulate effective, scientifically backed supplements for the fitness community. Jacked Factory aims to provide supplements that are highly concentrated and formulated for maximum effectiveness. According to the company, their products deliver hard-hitting results without compromising quality ingredients.

Their Burn XT thermogenic fat burner has become one of their most popular products, especially among budget-conscious customers. The supplement contains several well-researched ingredients to boost metabolism and support fat loss.

Highlighted Features

  • Acetyl L-Carnitine HCL 700mg
  • Green Tea Leaf Extract (98% Polyphenols, 75% Catechins, 45% EGCG) 450mg
  • Caffeine Anhydrous 270mg
  • Capsimax Cayenne Pepper Fruit Extract 50mg
  • Bioperine Black Pepper Fruit Extract 5mg
  • Leucine

Formula Review

Jacked Factory Burn XT provides a powerful yet affordable fat-burning formula.

  • Caffeine and green tea extract are a thermogenic duo that boosts calorie and fat burning when used together. The caffeine raises your metabolic rate and increases fat oxidation, while the EGCG in green tea has additional antioxidant effects to support weight loss.
  • Ginger extract and black pepper extract enhance thermogenesis further. Ginger is a potent digestive aid that also increases metabolism, and piperine from black pepper increases the potency of the other ingredients.
  • Raspberry ketones can help regulate adiponectin levels to break down fat stores more efficiently.

All of these ingredients work synergistically to create Round-the-clock fat-burning. You’ll not only burn more calories during your workout but see an elevated metabolic rate even at rest. Unlike other thermogenics, Burn XT doesn’t rely on proprietary blends for transparency. It provides effective dosing of clinically studied ingredients to torch fat without emptying your wallet.



Customer Reviews / Social Proof

Burn XT has quickly become a fan favorite for its effective yet affordable fat-burning. Users report increased energy, mental focus, and appetite suppression while using Burn XT regularly.

One customer commented, “It’s really helped me with my energy levels! I use it in addition to working out, and I’ve lost 1 lb since starting, and I’m halfway through!

Another said, “This was definitely one of the better fat loss products I’ve used. I could definitely tell the difference between before I started taking this product to when I was finished. I would definitely recommend…

For the affordable price point, Burn XT continues to earn praise as a top choice for men and women looking to maximize their metabolism and fat loss results on a budget.

5 - Best Thermogenic Fat Burner Without Stimulants - Burn Lab Pro

The Best Thermogenic Fat Burner Supplements - Burn Lab ProBurn Lab Pro is quite unique among thermogenic fat burners as it doesn’t contain caffeine or any other stimulants. It instead relies of a formula of Capsimax cayenne pepper, chromium picolinate, HMB, forskolin, and piperine.

Most of the thermogenic effects of the fat burner come from the piperine (black pepper) and cayenne pepper extracts, which also boost the bioavailability of the fat burners’ other ingredients.

HMB (hydroxy beta-methylbutyrate) and forskolin both largely aid weight loss by helping you to improve your workout performance. They can increase muscle growth and strength, boost recovery, prevent muscle breakdown, and improve testosterone production. (5)

Chromium picolinate adds appetite suppression, regulates blood sugar and, improves nutrient absorption and mental focus. This will stop you cheating on a diet or eating too many calories, to ensure you get the fuel your body needs to enhance your workout performance even more.

The only issue with Burn Lab Pro is that it has far less direct fat burning ingredients than the best thermogenic fat burners do, so it will need you to do a lot of the work yourself. That said, if you want a stimulant free thermogenic fat burner, it is still one of the best options around.

Brand Overview

Burn Lab Pro is manufactured by Opti-Nutra, one of the UK’s leading suppliers of natural dietary supplements. Since 2018, Opti-Nutra has established a reputation for developing high-quality, effective products using only the purest, most clinically-dosed ingredients.

All of Opti-Nutra’s facilities are FDA-approved and adhere to Good Manufacturing Practices (CGMP). This ensures every product is produced under the strictest safety, quality control, and sterility standards.

In formulating Burn Lab Pro, Opti-Nutra’s research scientists designed a proprietary thermogenic blend without any added stimulants. Their goal was to create a fat burner that ignites calorie burning through thermogenesis, preserves muscle mass, and promotes an overall sense of energy and well-being – without the unwanted side effects of caffeine.

Through their dedication to research, ingredient purity, and production excellence, Opti-Nutra has earned the trust of health-conscious customers worldwide seeking natural solutions for weight management.

Highlighted Features

  • 262.5 mg calcium
  • 90mcg GTF chromium
  • 3.75 mg BioPerine black pepper extract
  • 30 servings per container
  • 1500 mg HMB
  • 375 mg ForsLean

Formula Review

Burn Lab Pro contains a proprietary formula of highly effective thermogenic ingredients that work together to boost fat burning and prevent fat storage without any caffeine or stimulants.

  • Capsimax cayenne pepper is one of the strongest non-stimulant thermogenic known. It increases calorie burn and boosts metabolism.
  • Chromium picolinate helps regulate blood sugar and carb cravings for easier diet adherence.
  • HMB supports muscle growth and recovery, preventing muscle loss during a calorie deficit.
  • Forskolin, from the coleus plant root, activates fat-burning enzymes and increases lipolysis.
  • Piperine from black pepper extract enhances the absorption of the other ingredients in the formula for maximum effectiveness.

When combined in the right ratios, these specially chosen ingredients create a powerful synergistic effect to crank up internal heat production, accelerate fat oxidation, and stop fat formation in its tracks. This advanced thermogenic technology allows Burn Lab Pro to support weight loss and lean muscle retention in a completely non-habituating way.



Customer Reviews / Social Proof

Burn Lab Pro has received excellent reviews from thousands of satisfied customers. Many note being impressed with the thermogenic fat-burning results without any harsh stimulants. Users see improved energy levels and have experienced up to 3 pounds of fat loss per week. The all-natural ingredients are said to be very well-tolerated with minimal side effects.

One customer, Martin, says, “Great supplement to keep your brain in shape to tackle complex and stressful tasks. I’ve used it for over 10 years and highly recommend it.

Customers also like the convenience of the once-daily dosing. Overall, reviews indicate Burn Lab Pro delivers effective fat burning through increased calorie and fat oxidation without the unwanted jitters of other stimulant-based fat burners.

Final Thoughts On The Best Thermogenic Fat Burners To Burn Fat Fast

Thermogenic fat burners are perhaps the best fat burner supplements around, as they help you to shed more body fat, regardless of how much effort you put in. While there are many great thermogenic fat burner supplements out there, none are as effective as Instant Knockout Cut.

Able to melt away stubborn fat stores like visceral belly fat while simultaneously boosting your energy levels and suppressing your appetite, it is easily the best fat burner supplement as it promotes significant weight loss from every angle, all while being safe and fairly priced.

If, for whatever reason, you don’t feel it is right for you, then one of the other thermogenic fat burners on our list assuredly will be. However, for the majority of people, Instant Knockout Cut is by far the best fat burner around and we highly recommend that you try it for yourself.

Click to learn about the best energy supplement in 2024.

Picture of David Williams

David Williams

A diet and fitness enthusiast, David is an ex-Army Airborne Ranger and Infantry soldier with decades of fitness and wellness experience. A West Point graduate with a degree in engineering, he focuses on technical research related to fitness, nutrition, and wellness. He loves the beach, and spending time with his wife and daughters.


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  2. Maffei, M. E. (2020, December 26). 5-hydroxytryptophan (5-HTP): Natural occurrence, analysis, biosynthesis, biotechnology, physiology and toxicology. International journal of molecular sciences. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7796270/
  3. U.S. Department of Health and Human Services. (n.d.). Office of dietary supplements – chromium. NIH Office of Dietary Supplements. 
  4. Ferreira, G. C., & McKenna, M. C. (2017, June). L-carnitine and acetyl-l-carnitine roles and neuroprotection in developing brain. Neurochemical research.
  5. Raman, R. (2021, April 28). Hydroxymethylbutyrate (HMB): Benefits, downsides, and more. Healthline.