Fat burners are not a ‘magic pill’, regardless of advertisements. Instead, they are typically a composition of natural, plant-based compounds that may support healthy fat loss when combined.
A great fat burner should be:
In this feature you’ll find the best fat burners available in 2021. Each one has been carefully chosen, rated and ranked by our panel of experts who’ve analyzed everything from ingredients to serving sizes.
We’ve also measured safety too. None of the product listed here should pose a health risks to the user.
It’s important to understand that this type of supplement is not proven to influence weight loss in any way and should not be relied upon to do so. However, many fat burner ingredients are supported by studies that suggest they could accelerate progress.
Rest assured, we’ve referenced cutting-edge research throughout this review. For both us and your fat-loss results, the test of a good supplement is in the science.
If you’re eating clean, exercising and are in a calorie deficit, these supplements could help you realize your goals sooner. Healthy fat-loss isn’t always easy, but a high-quality fat burner can support it.
High-quality fat burning supplements may offer support in numerous ways. Many supplements are created with the intention of providing help in each step of the fat loss process.
Research suggests that many common fat burner ingredients can:
Healthy fat loss may appear to be all about restricting calories and increasing exercise, but it is ultimately a result of maintaining an energy deficit.
Yet, while this is true, there are other factors that can influence this; hunger, mood, energy levels, and physical health all play a part in sustainable body recomposition. A high-quality, premium fat burning supplement should hold ingredients that sustain one or more of these things.
Safety is an important part of any supplement. If it’s reputable, it should be considered safe. Otherwise, we do not feel it is worth the risk to your health, no matter how effective it might be in the short term. While fat burners aren’t designed to be used extensively month after month, they shouldn’t leave lasting side-effects, if any at all. Instead, they should provide users with a safe experience, both during and after taking them.
At SpotMeBro, we pride ourselves on providing clear, complete, and impartial reviews. Our mission statement is to provide insightful information, so you can make the best choice. With that in mind, here’s what goes into constructing each product review:
In order to write the most fair and impartial reviews, we treat every product the same – regardless of price, reputation, or brand.
To quality control this process, we align each individual product with our set reviewing criterion. This makes it possible to assess potential effectiveness across the board, as well as safety, and product value.
Finding the right supplement to review is our first step. For us, they need to stand out from the crowd, and pique our interest from the start. We’re looking for impressive formulas, natural ingredients, safer serving sizes, and absolutely zero proprietary blends.
After choosing a supplement to test, we’ll start to cross-examine its ingredients with scientific research and evidence. Doing this allows us to closely estimate effectiveness and safety.
Next, we’ll look at cost alongside serving sizes to work out value. While this might not necessarily impact performance, we understand how important value for money is for most men.
Scoring high on our safety test requires:
Scientific evidence is what ultimately makes a fat burner’s ingredients worthwhile. Serving sizes also need to measure up to these studies too, otherwise we consider a supplement over- or under-filled. Overfilling can be an indication of higher side-effect risks.
Proprietary blends are also the sign of a bad supplement. Undisclosed, mysterious mixes are a red flag for safety – as we don’t know what’s in them. It’s impossible to say whether a product may be harmful if supplement companies hide ingredients in this way.
Transparency is the only way to truly judge the potential safety of a product. Note that every fat burner in the following list shows its full list of ingredients.
Men use fat burning supplements to accelerate their results. Effectiveness is therefore the number one priority when choosing the product for your goals.
Measuring potential effectiveness becomes possible by examining each ingredient. We separate a product formula into individual components, before cross referencing them with scientific evidence. Then, we’ll compile this information to see whether a fat burner should be effective.
When breaking down a formula we ask:
Science is the only way we can assess these points. To do this, we reference research papers, studies, and articles from reputable sources. We only use accredited scientific authors and organizations.
Key point: Ingredients are inspected on their own against cutting-edge research knowledge. What we find is then gathered to determine the potential effectiveness of the complete formula.
Keep reading to find out the best fat burners available in 2021.
Finishing in top position for The Best Fat Burner of 2021 is Instant Knockout CUT.
Originally developed to aid MMA fighters and boxers burn fat, CUT allegedly offers the following benefits:
The creators also claim it allows calorie restricted athletes continue to train to high levels. This may be down to Instant Knockout’s CUT smart energy-boosting abilities.
Championed by MMA star trainer Greg Jackson and his elite fighters, Instant Knockout CUT isn’t short of testimonials. For example, the UFC pioneer Diego Sanchez said it even helped him lose 45 lb. for a major tournament.
Instant Knockout says it can get you:
But we can’t base our review on hearsay and promises alone. These claims are not reputable sources like scientific studies. Therefore, they will not influence this review.
Instead, we’ll break down the formula and serving sizes, then compare the results to research to judge them.
Instant Knockout may work by providing the body with ingredients that could support weight loss. Some have been added with the intention of influencing metabolism directly, while others offer help through other avenues. Together they may offer a complete spectrum of support for men looking to lose body fat.
As Instant Knockout CUT begins to release its ingredients, men who take it should feel energized. Hunger and cravings should also be reduced, which can relieve the mental stress of dieting.
Metabolism increases may also occur, although you will not feel this. Thermogenic ingredients inside Instant Knockout CUT are proven to raise daily calorie burn. As a result, these could help keep you in a calorie deficit, which is essential for fat loss.
Instant Knockout CUT provides the most benefit when taken consistently every day. Routine supplementation is advised.
Cayenne Pepper
A major player in CUT’s arsenal, cayenne pepper bolsters fat loss on multiple fronts.
Cayenne pepper contains a compound named capsaicin. Studies indicate this thermogenic not only augments energy expenditure, but also fat oxidation [1]. This could amount to more calories burned and a higher rate of fat loss from Instant Knockout.
Green Tea Extract
Like cayenne pepper, green tea extract delivers numerous potential fat burning benefits [2] [3].
Firstly, green tea is a powerful thermogenic, which raises metabolism [4]. Plus, it can also deliver energy for exercise via caffeine [5].
Glucomannan
Once inside the stomach, glucomannan expands to cause feelings of fullness, which tackles hunger.
Six studies have confirmed glucomannan to be effective for short term weight loss [6].
Caffeine Anhydrous
According to researchers, caffeine can be beneficial for both high-intensity and maximal endurance sports [7]. Other studies also link it to better blood sugar control, thermogenesis and fat oxidation [8] [9].
L-theanine
An amino acid normally found in black tea, L-theanine works alongside caffeine to enhance its benefits, delivering improved focus, drive and energy[10], whilst keeping negative side effects like jitters at bay [11]. It’s also thought to significantly suppress the appetite and fight stress[12].
What are people saying about Instant Knockout CUT
Instant Knockout CUT has been well met by the reviewing community. When our team searched online, they saw a heavy majority of testimonials and reviews were positive.
The following are three excerpts they found:
Cost is something all reviewers mention in their articles. However, they, and us, feel that Instant Knockout’s price reflects its premium quality.
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Instant Knockout CUT delivered a powerful performance during each step of this review. Therefore, we’re making it our frontrunning fat burner for 2021.
The science suggests that teaming its potent profile with calorie restriction, can lead to accelerated energy burn. This should also be reinforced by reduced hunger.
Our final point is Instant Knockout’s physique protection. The vitamins included in this formula can play important parts in regulating testosterone and muscle.
Summary: Instant Knockout CUT is our number one fat burner based on effectiveness, superior quality, and outstanding safety. It hit the mark at every step of this review, showing a potent cutting-edge formula and good value for money. We recommend Instant Knockout CUT to any man looking to support their fat burning journey.
Taking the runner up spot for The Best Fat Burner of 2021 is Hunter Burn.
After breaking out during the closing stanza of 2018, Hunter Burn drummed-up immediate buzz. Aimed at high-flying, ambitious men, this premium supplement claims to support the demand of their work-to-lifestyle balance by:
Hunter Burn pledges to provide a fat-burning edge “without substitutes”. According to its creators, the formula has been composed especially for the man who “consistently demands the best”. With a streamlined, potent ingredient composition, Hunter Burn certainly stands out.
Hunter Burn promises to help you:
All claims aside – we must investigate Hunter Burn thoroughly. On the surface, this is an ambitious supplement, specifically created for an aspirational audience.
After taking Hunter Burn men should notice its appetite suppressant qualities taking effect. They may notice their hunger and cravings diminish, which is helpful for fighting overeating.
Natural energy should also be provided by the power of Matcha Green Tea. However, to ward off any possible jitters, L-theanine has been included for a smoother release. Many in the industry have dubbed this combination ‘smart caffeine’ due to the calm focus the duo provides.
Matcha, the more powerful form of Green Tea, also offers thermogenic effects to increase metabolism. Further calorie burning support is also added by Cayenne Pepper to help maintain a deficit diet.
Hunter Burn’s carb blocking ingredient should also start to reduce the amount of potential weight gain experienced from eating carbohydrates. This is something that helps Hunter Burn stand out against the competition, as many older products don’t feature White Kidney Bean.
Once ingested these ingredients should begin to aid the fat loss process.
What’s in Hunter Burn?
Cayenne Pepper
As we’d expect from a respectable fat burner, Hunter Burn contains a potent serving of cayenne pepper. This is a very common, widely used thermogenic [1].
Glucomannan
Also known as konjac root, glucomannan is a soluble fiber found in South East Asia. According to scientific research, it should be effective at reducing appetite and providing feelings of fullness [6].
Matcha Green Tea
Rather than opt for the commonly used caffeine anhydrous, Hunter have chosen matcha green tea. The safe natural caffeine content found within it should offer energy support, including enhanced attention [14] and additional fat burning benefits [15].
Vitamin D
Including vitamin D is an intelligent move as it’s shown to promote testosterone production [16]. In turn, healthy male hormone levels may result in increased lean mass, reduced body fat, and better energy levels [17].
White Kidney Bean
Unlike almost-all lower-tier competitors, Hunter Burn contains white kidney bean. This smart ingredient should work to help block the digestion of carbs [18].
Although a newer supplement, our team found many Hunter Burn reviews online. And much like Instant Knockout, almost all of them were positive.
Here are excerpts taken from three:
Price is a common theme in Hunter Burn reviews just like the ones for Instant Knockout. Hunter Burn is unarguably at the top end in terms of cost, mostly due to its high-grade formula and manufacturing processes. However, although it is expensive, we feel it’s worth the cost.
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Hunter Burn have broken onto the fat burning scene with a set of standout debut supplements – with this weight management aid as the start of the show.
This supplement’s sleek engineering and cutting-edge formula makes it ideal for the professional. There are no fillers in Hunter Burn, which is clear in their choice of only six ingredients.
Finely tuned larger servings are selected to meet the needs of today’s busy man. Premium quality makes it good value for money too. However, we feel Instant Knockout is more established and affordable, which is why Hunter Burn places second. Hunter Burn broke onto the supplement market with an impressive cutting-edge formula and the most potent servings we’ve seen. We recommend this complete fat burner for men who can afford its premium price.
Taking third place is the stimulant-free Burn Lab Pro. Not only does this supplement promise to burn fat, it also claims to support muscle too.
According to its creators it is designed to:
Burn Lab Pro Fat Burner should deliver good fat loss results because of its smart stacking strategy and ample potency. It’s stimulant free, as the creators decided to focus on supporting muscle-building to burn fat.
Burn Lab Pro Fat Burner also has Coleus Forskohlii and HMB, which are to innovative fat burners that should combine to work as:
On top of its muscle building combo, Burn Lab Pro stacks cayenne pepper as CapsiMax®, a research-backed patented fat burner. BioPerine® is also a patented black pepper extract that can boosts absorption and thermogenesis.
Stimulant-free fat burners like this one sometimes take a different, more unique approach to supporting your goals. Burn Lab Pro is designed to aid fat loss, by supporting muscle building.
Once ingested, Burn Lab Pro Fat Burner should start to accelerate your metabolism. Cayenne Pepper Extract’s thermogenic effect should raise your body temperature through boosted calorie burn – something that may be amplified by Black Pepper increasing Cayenne’s bioavailability.
HMB and Coleus forskohlii, in theory, should then start to positively influence muscle building. While HMB is added to neutralize muscle damaging enzymes (among other benefits), Coleus forskohlii should regulate both thermogenesis and testosterone production. As testosterone is essential for both muscle building and a lean body composition – this last ingredient is a major, often underrated player.
HMB (ß-Hydroxy ß-Methylbutyrate)
HMB (ß-Hydroxy ß-Methylbutyrate) at 1000mg has been added to optimize fasted training results [19].
This metabolite of the amino acid leucine should protect your physique by neutralizing muscle-damaging enzymes. Protein synthesis can also increase after taking HMB too [19].
Coleus forskohlii
Coleus forskohlii, has been shown to optimize hormonal cell messengers to regulate thermogenesis and testosterone [21].
Not only that, but it should also activate the enzyme protein kinase, which encourages lipase to enable fat breakdown [21].
Cayenne Pepper Extract
Another regulator of thermogenesis is cayenne pepper extract. Studies have shown this spicy powder triggers thermogenic reactions inside the body, raising metabolism [1].
Black Pepper Extract
The thermogenic efforts of SPORT Fat Burner are also backed up by black pepper extract, which can increase bioavailability. This ingredient limits adipogenesis, which is the generation of new fat cells.
Like the other products in our top five, online reviews for Burn Lab Pro are mainly positive. People are impressed by the stimulant-free formula featuring only four ingredients.
Here are three takeaways from online reviews:
However, not all reviews are completely in favor of this fat burner. A few mention the limited number ingredients as a possible downside. Plus, some reviewers would have rather seen caffeine in the mix for a bigger energy boost.
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Burn Lab Pro Fat Burner is a great stimulant-free option. Its streamlined formula is also better suited to people on a budget. If you enjoy fasted training, then Burn Lab Pro should help protect your physique. Also, unlike some others, this fat burner says it works by building muscle first. It doesn’t use many thermogenic ingredients or caffeine to aid fat loss. This could be a downside for some. Burn Lab Pro Fat Burner is an innovative, streamlined, and stimulant free option for men who want a different approach. We recommend it for additional muscle building support.
Securing fourth position is Transparent Labs PhysiqueSeries Fat Burner. Featuring a nine-ingredient profile, it looks to support fat burning with a three-pronged approach.
Once consumed, this fat burner should:
Thermogenic compounds forslean, green tea extract, and synephrine should increase resting metabolism. This trident of heat-inducing ingredients may help raise calorie burn more than diet alone.
Next, the not-so-obvious use of HTP-5 is added to combat hunger cravings. Whereas most fat burners look toward caffeine and glucomannan, PhysiqueSeries thinks outside the box.
In fact, the caffeine content of each serving is only 120 mg. This may appeal to stimulant sensitive users.
PhysiqueSeries also offers additional mental support. They foresaw the stress sometimes caused by dieting and tried to counteract it with numerous ingredients.
Transparent Labs say their fat burner is perfect for:
PhysiqueSeries Fat Burner could help men reduce body fat in a number of ways. Not only does it offer actual physical benefits, but mental backing too.
As the ingredients inside this fat burner are absorbed, they should begin their thermogenic process. Your body temperature should rise, and your natural calorie burn could increase. If you’re within a calorie deficit this should aid fat burning.
Caffeine and Green Tea extract should also provide an energy boost while dieting. Motivation and drive can wane when calories are reduced, and the body tries to conserve energy – these ingredients are intended to help sidestep that.
Anti-stress and mood enhancers are also important for fat loss. Fortunately, Transparent Labs have included the likes of L-Tyrosine and 5-HTP in their supplement to help here. Improved mood could help with everything from reducing snacking to feeling encouraged to work harder during exercise.
Green Tea Extract
One of green tea’s body-benefiting factors is aiding fat loss. Research has shown that EGCG’s inside this ingredient decrease fat synthesis, increase fat breakdown, and promote better glucose utilization [21].
The caffeine content of green tea should also provide both energy and raised metabolism [4] [5]. When combined with l-theanine (present in green tea), the stimulant effect of caffeine can be smoothed out. This helps users get a clean feeling of focus [21].
5-HTP
This ingredient should offer mental support for your fat loss-journey. It does this by helping promote serotonin secretion.
Studies have linked 5-HTP to suppressing appetite in overweight dieting individuals [23]. Plus, people who take 5-HTP have been found to have lower carb intake and show fat-loss while displaying reduced appetite [24].
Forslean (10% forskolin)
Forskolin is included to stimulate the release of stubborn fatty acids from body fat. In turn, this should make the weight-loss process easier.
One study published in Obesity Research and Clinical Practice discovered Forslean supplementation decreased body fat while increasing lean muscle in obese men [25].
L-Tyrosine
This is the active form of tyrosine and is a strong anti-stress amino acid. Some research has even shown it can lower stress during extended periods of consciousness, as well as after intense exercise [26] [27].
According to Transparent Labs this ingredient could help to reduce the mental challenges of being on a diet and may influence adherence.
Caffeine Anhydrous
This ingredient is a common part of fat burners and is a dehydrated, powdered version of caffeine.
Studies have linked it to better energy boosting effects than coffee [7]. Plus, it’s a powerful thermogenic that should increase resting calorie burning [9].
People who supplement with caffeine often experience better blood sugar control too [8]. This is an import process that should aid fat loss.
This fat burning supplement has been on the market for a while now so there are other reviews out there. As expected, a lot of them are positive. We were not able to find any before and after testimonials from customers, however.
But not everybody is a fan of the PhysiqueSeries formula, and the online supplement community is slightly split. Some people like the mental-support approach, while others prefer more muscle maintenance vitamins.
Here are three opinions from other online reviewers:
One thing almost all reviews mentioned it this fat burner’s caffeine content. If you’re sensitive to stimulants, you may want to start on a small serving size. While the amount of caffeine is small it’s still worth checking your response first.
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PhysiqueSeries Fat Burner features a complete, comprehensive formula to aid fat loss. Although it contains traditional thermogenic ingredients, it also offers mental support. For this reason, we’d recommend this to men who want to remove stress from dieting.
In fifth place is Leanbean – the female fat burner that has surprising benefits for men.
This fat burner has undergone a transformation recently, eliminating some ingredients and upping the dose of other well-known fat loss supporting compounds. Let’s take a look at what’s inside.
Created using 12 ingredients, Leanbean offers a rich formula to aid fat loss, as well as supplying numerous superfoods. And although it is marketed toward women – the ingredients inside can impact fat burning for both sexes.
Men who take Leanbean should experience:
All without high amounts of the stimulant Caffeine. Instead, the creators say their fat burner provides energy using modest quantities from natural sources like Green Coffee Bean.
Leanbean also features body balance promoting vitamins and superfoods. Poor metabolism, inflammation, and toxins should be less of an issue because of this. The likes of acai, for example, could aid blood sugar levels. Furthermore, this product should also help curb cravings and manage your hunger.
Leanbean looks to boost metabolism via Turmeric and Green Coffee Bean, which have been proven to provide thermogenic effects and raised calorie burn [36] [29]. Fat oxidation can also be amplified by Green Tea, as it’s EGCG catechins influence enzymes that trigger adipose cells to release fat.
Superfood extracts and vitamins also fill Leanbean’s formula to protect the body. The official website says these extracts help to create optimal body balance – helping you achieve a normal, energy yielding metabolism and reach a healthy bodyweight. BioPerine® of these holistic choices.
There are also ingredients included in this product that should encourage serotonin production. This, alongside the potential craving diminishing qualities of Glucomannan, may reduce overeating.
Leanbean markets itself on a low Caffeine content delivered inside natural sources like Green Coffee Bean and Garnicia Camobogia. According to the manufacturer they aren’t as powerful as the popular anhydrous form – studies show this to be true also [7].
Consistent supplementation of Leanbean should enhance fat loss.
Glucomannan is a dietary fiber extracted from the root of the Konjac plant. It has been well documented as an aid to weight loss thanks to its ability to suppress appetite [6].
Once ingested, this soluble fiber begins to slowly expand in the stomach. This creates a sensation of fullness without increasing the user’s calorie count. Therefore, it can help men stay within their necessary calorie deficit.
Like many other health supplements, Leanbean contains a B Vitamin Complex. Including these essential vitamins helps to promote better metabolism, muscle function, and nervous system health – three things vital to sustainable fat loss.
B vitamins can also aid in warding off tiredness during calorie restriction. It’s because of this they’re commonly associated with energy and motivation [31].
3. Zinc
A key mineral found in a number of different plant and animal foods, zinc may be essential in aiding immunity as well as reducing inflammation.
Its inclusion in Leanbean however is more to do with its effect on weight loss. Studies have shown that zinc supplementation can improve BMI, heighten weight lost and improve triglyceride levels [34].
Leanbean call this their healthy alternative to Caffeine Anhydrous, a potent stimulant. It won’t provide the same alertness and energetic qualities but has similar thermogenic capabilities [32].
Turmeric also contains a compound called Curcumin, which has anti-inflammatory properties. Therefore, this ingredient may offer recovery from exercise [33].
5. Choline
Leanbean include Choline in the formula for its role in many different bodily processes. Because our bodies don’t produce enough of the nutrient, we must supplement our intake through food or other sources.
Choline is known to help with the metabolism of fat – breaking down fat for use as an energy source [35].
What are people saying about Leanbean?
As Leanbean has been on the market for some time there are many reviews for it online. Here is a collection of key excerpts taken from them:
Much like all reviews concerning top-tier supplements there is a mention of price. However, as The Sport Review say, this is a reflection on the quality of Leanbean. While there are cheaper alternatives, we find they’re typically lower quality, which is why we still see Leanbean as providing good value for money.
We recommend Leanbean to men who want a holistic fat burner with a less aggressive formula. The ingredients do have relevant studies proving their worth, meaning it also has a high level of potential effectiveness. If Leanbean is in your budget and you’d prefer a subtle fat burning supplement – this might be it.
This post was last modified on December 23, 2021 7:17 pm
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