3 Best Fat Burners of 2020-2021 [Best of 77 Products Tested]

This article is updated every week* as our authors test new products.

Appetite Suppressant


  • Suppresses Your Appetite
  • Helps in Improving your Metabolism 
  • 90 Days Refund Policy 
Best Thermogenic

Instant Knockout

instant knockout
  • Strong Fat Burner for Gym Enthusiasts
  • Thermogenic Operation increases Metabolism
  • Natural Ingredients
Increases MetaBolism

Hunter Burn

hunter burn
  • Best used for Improving Metabolism
  •  Increases Energy Levels

Are you tired of trying different diet plans without any success? Do you want to get a lean body without having to starve yourself and feel emotionally and physically drained?

Then you better invest in a quality fat burning supplement! 

With the right choice, these supplement can boost your metabolic rate, helping you lose more weight in a shorter period of time. 

Besides, it will leave you feeling full of life, energized, and ready to conquer any obstacle that it may present to you during your weight loss journey! 

Adding a quality appetite suppressing supplement to your diet can make a real change in the way you are losing weight and building strong muscles. But choosing the right thermogenic can be quite a difficult task to complete on your own. 

Knowing that we made a list of three of the best thermogenic supplements available on the market today. It was important to us to choose thermogenic supplements that are effective, contain the right kind of ingredients, but are also affordable and available for anyone, no matter where they may live.

And so, we ended up choosing what is, in our honest opinion, the three best fat burners known in the market – PhenQ, Instant Knockout, and Hunter Burn. All of these can be easily purchased online, come with a money-back guarantee, and have loads of scientific research talking about their  ingredients.

Best Fat Burners of 2020-2021

1) PhenQ: High Quality & Editor's Choice

  • Best Ingredients to Suppress Your Appetite
  • Promotes Metabolism to Burn Fat Fast
  • 190,000 Customers & Good Testimonials
  • 90 Days Refund Policy

Brought to us by WOLFSON BERG LIMITED, PhenQ is a promising weight loss supplement that offers all of the benefits that Phentermine used to offer, and more, with one major difference – PhenQ causes little to no harmful side-effects whatsoever. You may find it hard to believe that there is an effective weight loss supplement that does not cause any side-effects, but there is – and its name is PhenQ!

What makes PhenQ even more special is the fact that it works from multiple aspects all at once to cause a noticeable difference in the numbers on the weight scale. And so, PhenQ works as an amazing fat burner, appetite suppressant, and even a metabolism booster to help enhance your weight loss game.

To use PhenQ, all that you have to do is take one pill with your breakfast and then another one with your lunch. Avoid taking PhenQ later than 3 pm to prevent experiencing any sleep issues due to the caffeine found in this thermogenic supplement. Each bottle comes with 60 pills, which will last you a whole month.

PhenQ Benefits

Thanks to the regular use of PhenQ, you are looking at gaining the following health benefits:

  • Weight loss and improved weight management;
  • Enhanced energy levels and reduced fatigue;
  • Body detox;
  • Better mood;
  • Improved sleep;
  • Slower aging process;
  • Explosive workouts;
  • Improved mental agility, etc.


What makes PhenQ so special is its unique blend of ingredients, five of which are reclaimed fat-burners that will help you get rid of that embarrassing belly fat. Here are all the ingredients as listed on the manufacturer’s official website.

a-Lacys Reset®

Capsimax powder

Chromium Picolinate



L-Carnitine Fumarate

How Does It Work?

PhenQ may not be a magical pill, but it sure does have some wondrous methods through which it delivers the results that you have been looking for. a-Lacys Reset® focuses on increasing your body’s thermogenesis so that it enables the body to burn more fat than ever. Soon, you will not be able to recognize your body with all that fat missing from around your belly and thighs. 

It also increases the metabolic rate, allowing you to burn more calories even when you are sitting down on your couch. In return, your faster metabolism will now increase the thermogenesis in the body even more, which will accelerate the fat-burning process.

But a-Lacys Reset®, as effective as it is, could not do all of this on its own. It has a bit of help from Capsimax powder, yet another trademark blend that WOLFSON BERG LIMITED has created. Capsimax powder is a blend of capsicum, piperine, caffeine, and niacin. All of these ingredients work well together, enabling your body to burn more fat as they are increasing that heat inside of it.

Chromium Picolinate suppresses your appetite by controlling the blood sugar levels. This ingredient makes it possible for any carbs and sugars from the food that you eat to be used right away instead of stored in the form of fat. Nopal is a helpful fiber which will also help suppress your appetite by satisfying your hunger for a long time. 

Caffeine will focus on energizing your body, improving your mood, and mental agility, but most importantly, it will also boost the thermogenesis in the body. And the process of fat burning will be made easier thanks to L-Carnitine Fumarate – an amino-acid found in red meat, 

Is It Worth Your Money?

For such an affordable price, you are getting a high-quality, clean formula that has scientifically-backed ingredients, all of which focus on improving your general wellbeing, but most importantly focuses on boosting the thermogenesis in the body so that you end up burning huge amounts of stored fat. PhenQ is one of the best thermogenic supplements available right now on the market.

2) Instant Knockout: Best for Thermogenesis

instant knockout
  • Ingredients to Promote Thermogenesis
  • Increases Metabolism to Burn Fat Fast
  • Natural & Tested Ingredients

Developed by Roar Ambition, Instant Knockout is a revolutionary calorie shredder that will help you become the best version of yourself. Its smart and clean formula makes weight loss easier than ever. But in order to help you lose weight, it focuses on boosting the metabolic rate while also suppressing your hunger. That way, you will be burning more calories on the go without the need to battle any cravings and feelings of hunger.  

Instant Knockout Benefits

Instant Knockout offers more benefits beyond weight loss, including:

  • Boosted energy levels;
  • Appetite suppression;
  • Increased testosterone levels;
  • Improved mood;
  • Better weight management.

Instant Knockout works as a thermogenic, which is exactly how it can burn through your stored fat without any problem. By increasing your metabolic rate, Instant Knockout causes the metabolism to generate heat, which in result helps burn more calories and fat inside the body. 

But Instant Knockout is not only for men. It offers the same beneficial effects to women as well. You see, because of their lower testosterone levels, women often struggle with building a lean, toned body in a short period of time – a task which most men do not have any problem with as soon as they start to train regularly and up their protein intake. 

To get the most out of Instant Knockout, you will need to take four capsules per day at certain times, such as – before breakfast, before lunch, in the afternoon, and before dinner. All of the four capsules need to be taken before 6 pm. 


To create such a powerful thermogenic, Roar Ambition had to experiment using different ingredients until they found the exact right ones. As a result of all of their hard work, we can now rely on a strong formula that is here to help us maintain a healthy weight and build a body that we can be proud of. The ingredients that have been used to produce Instant Knockout are:

Green tea extract

cayenne peppers


caffeine anhydrous

vitamin B6

vitamin B12

GTF chromium



green coffee bean

How Does It Work?

We explained how Instant Knockout is an effective thermogenic, which means that it mainly works by inducing the process of thermogenesis in the body. Certain ingredients focus on increasing the metabolic rate and generating more heat so that more calories get burned even while doing the simplest activities, such as sitting on the couch.

The two main ingredients that induce thermogenesis are Piperine and Cayenne pepper seeds, both of which have been scientifically proven to be able to elevate thermogenesis and boost the metabolic rate of the body. We also have Green tea extract and Vitamin B6, which contribute to the fat burning process by increasing the metabolic rate and fat oxidation.

Caffeine and GTF Chromium work well together to make sure that you are always on the top of your game, maintaining stable energy levels throughout the day. GTF Chromium also works to increase the metabolic rate and reduce your food cravings. Another ingredient that helps suppress the appetite is Vitamin B12 but also Glucomannan

And finally – Zinc. Zinc is responsible for boosting the production of a very important hormone in the body, also known as testosterone. But it also helps with your energy levels, carbs and fat digestion, and fat burning as well.

Is It Worth Your Money?

Instant Knockout has plenty of benefits to offer, considering how effective and high-quality thermogenic supplements it is. Offered at discounted prices, this thermogenic is one of the best ones on the market, especially if you are on a budget. When used regularly, it can help both men and women to burn more fat and calories, losing weight in a sustainable matter, while at the same time, they are building strong muscles that they can gladly show to the world later.

3) Hunter Burn

hunter burn
  • Alternative for: PhenQ
  • Best used to Increase the Metabolism
  • Increases Energy Levels

Hunter Burn is yet another high-quality thermogenic brought to us by the good people over at Roar Ambition. This thermogenic supplement is described as a powerful fat burning supplement thanks to the clean and effective formula of natural plant extract, vitamins, and minerals that it has. 

When paired up with regular exercise and a well-balanced diet, Hunter Burn will help you accomplish your dreams of looking like one of those models that you see on TV every day. And here is how Hunter Burn plans on doing that:

Hunter Benefits

  • Increasing your energy levels;
  • Inducing thermogenesis;
  • Suppressing your appetite;
  • Lowering your stress levels;
  • Improving your mood;
  • Increasing the testosterone levels.

Hunter Burn is to be taken three times a day. Simply take two capsules and have them with a tall glass of water – a total of six capsules per day. Not to worry – each bottle comes with 180 capsules, which are the equivalent of one month’s supply.


In what is described as Hunter Burn’s premium formula, you will find many quality ingredients. Make note that all of the ingredients that we are about to mention have already been extensively tested and researched, and each and every one of them possesses a certain ability to induce weight loss.

Vitamin D3

Konjac root extract (Glucomannan)

White kidney bean extract


Matcha green tea

Cayenne pepper

How Does It Work?

Like Instant Knockout, Hunter Burn too, is a great supplement suitable for both men and women, thanks to its high levels of Vitamin D3, which is more of a steroid sex hormone than a vitamin. Many men and women are unaware of being deficient in this very important vitamin. Vitamin D3 deficiency poses many health risks, but it also influences the quality of your workouts as well as reducing their quality and making the task of building new muscle mass more difficult than ever. Luckily, there is more than enough Vitamin D3 included in Hunter Burn.

Konjac root extract, also known as Glucomannan, is an ingredient that is found in both Instant Knockout and Hunter Burn. This dietary fiber will help you feel fuller, thus preventing the common hunger cravings. The white kidney bean extract is here to help you conquer your carbs cravings. Not only will it help reduce those cravings of yours, but it will also change and improve the way that your body digests and absorbs your carbs, preventing them from getting stored in the form of fat.

L-Theanine helps with many problems all at once. It promotes fat loss, prevents food cravings, lowers your stress levels, and on top of that, it boosts your mood and motivation. And last and probably the most important ones are Matcha green tea and cayenne pepper. 

Both of these ingredients are powerful thermogenic, which will help increase the heat inside your body, thus burning more calories. The reason why they have chosen Matcha green tea over regular green tea is that Matcha is known to be a much stronger thermogenic as compared to the old green tea. And cayenne pepper, because of its capsaicin content, cannot be left out from the formula of any high-quality thermogenic supplement, including Hunter Burn.

Is It Worth Your Money?

Hunter Burn sure does have some pretty interesting ingredients, all of which add to the quality of its unique formula. With Matcha green tea and cayenne pepper, we cannot ignore its powerful thermogenic abilities and with that its strong weight loss abilities as well. As you can see, Hunter Burn goes beyond heating your body and burning calories – it also helps improve your overall wellbeing, positively influencing your mood, sleep, and diet as well.

Thermogenic Beginner’s Guide

What Is Thermogenesis & Is It Safe?

Thermogenesis is a scientific term used to refer to heat generation – a factor that directly affects the metabolism and with that the overall weight loss process. It is a safe and natural process that is happening inside our bodies even though we are unaware of it. 

There are a total of three different thermogenic processes happening on a daily level – exercise-associated thermogenesis, non-exercise activity associated thermogenesis, and diet-induced thermogenesis. By increasing any of these three processes, you are increasing your weight loss rate as your body is burning more calories.

How Do Thermogenics Work?

The term “thermogenic” has the literal meaning of heat-producing, which is the thermogenics’ single method of action once introduced inside the human body. Any supplements that help your body burn more calories and fat are considered to be thermogenics since they are boosting the metabolic rate, burning calories, and thus generating heat. 

The Best Ingredients to Look for in a Thermogenic

Some thermogenics consist of one single ingredient, whereas others contain a blend of ingredients – a method that is most commonly being used, trying to increase the thermogenics’ efficiency and power. Here are some of the most commonly used ingredients with scientifically proven thermogenics properties. 

  • Caffeine

By increasing the levels of adrenaline in the body, caffeine stimulates the fat cells to release the fatty acids in the bloodstream, only to be then used as a primary energy source instead of carbs. A 2011 research showed that a 150-mg caffeine pill had helped the participants to burn an additional 150 calories over the course of one day. 

Other than acting as a thermogenic, caffeine also works to boost your energy levels, reducing any present fatigue. It boosts the appetite, reduces your hunger, and lowers any food cravings that you may have throughout the day, that would otherwise disturb your weight loss process.

  • Capsaicin

Capsaicin is a molecule found in chilly peppers and the reason behind their spiciness. Similar to caffeine, capsaicin stimulates adrenaline production, thus speeding up the metabolism and helping the body to burn more calories. It reduces the appetite, making it easier to stick to a calorie deficit, which is a must whenever you are trying to lose weight. One review showed that capsaicin supplements could boost metabolism by 50 calories, thus leading to significant weight loss results over time.

  • Cinnamon

Cinnamon is yet another proven thermogenic and a popular metabolism booster. Taken as a supplement or as a food additive, cinnamon has been scientifically proven to be able to balance blood sugar levels and eliminate the frequent food cravings in addition to being able to increase the heat in the body, burning more calories daily.

  • Turmeric

Most of the health benefits of turmeric are thanks to a special compound found inside it, also known as curcumin. Turmeric has been scientifically proven to be able to promote weight loss by reducing fat tissue growth, improve insulin sensitivity, and regulate metabolism. 

Are Thermogenics Safe?

Thermogenic supplements are generally considered safe to be used. Most of them report on causing little to no side-effects whatsoever. To reduce your risk of experiencing any side-effects, do choose quality thermogenic supplements only. 

Make sure that the supplement that you end up choosing and later using is of the finest quality and consists of ingredients that have been backed up by science. Once you get your hands on your chosen thermogenic, do follow the provided instructions and do not try to exceed the dosage on your own.

Most thermogenic supplements contain excessive amounts of caffeine, which is an important stimulant. If that is the case with your chosen thermogenic, pay attention to your caffeine intake throughout the day and, if needed, do make the needed alterations. Do not take any thermogenic supplements around bedtime to prevent insomnia and any other sleep issues.

What Are the Potential Side-Effects of Thermogenics?

Over the years, people have talked about experiencing some mild side-effects due to their use of thermogenic supplements. Here are the most commonly reported side-effects due to the use of thermogenics:

  • Restlessness;
  • Headaches;
  • Dizziness;
  • Digestive issues (diarrhea, stomach cramps, upset stomach, etc.);
  • Agitation;
  • Anxiety;
  • Insomnia;
  • Elevated heart rate, etc.

Conclusion: Which Fat Burner Is Best for You?

Thermogenesis is a naturally occurring process in the human body, one that is keeping us alive at this exact moment, although we are unaware of it. But while thermogenesis does occur on its own, it cannot hurt to give it a little push by introducing a powerful thermogenic supplement to our diet. 

Of all available thermogenics right now, PhenQ, Instant Knockout, and Hunter Burn are the best clean and effective thermogenics whose formulas have been approved by multiple scientific studies done in the past. Choosing even one of these powerful thermogenics can bring you closer to the body of your dreams, and all that you have to do is simply take the recommended daily dosage and let your chosen thermogenic do its magic.