2021's Best Fat Burner Pills: Top 5 Supplements for Burning Belly Fat

If this sounds like you, here’s some good news: Taking a thermogenic fat burner can give your body the extra nudge it needs to lose weight naturally.

In fact, the sheer number of fat burner supplements out there can make your head spin—how could you possibly know which fat burner to choose?

Luckily, we’ve rounded up and reviewed the best fat-burning supplements to help you make your decision. We evaluated each thermogenic fat burner on a variety of factors including ingredients, dosage, reviews, and price.

If you’re ready to accelerate your weight loss results and feel more confident than ever, here are the five best fat burner supplements of 2021.

5 Best Fat Burners on the Market

• PhenQ: Most effective fat burner
• LeanBean: Best for women
• Burn Lab Pro: Best ingredients
• Phen24: Best for increasing metabolism
• Instant Knockout: Best for men

#1 PhenQ: Best Overall

PhenQ is our top choice for the best fat burner supplement of 2021. Even though renowned supplements manufacturer Wolfson Berg Limited only released PhenQ last year, this fat burner has already helped more than 190,000 customers lose weight. The brand says that even people looking to drop more than 30 pounds of body weight will find success using PhenQ.

PhenQ helps you lose stubborn fat in five ways:

• suppressing fat production
• burning existing fat cells
• reducing appetite
• boosting energy levels
• improving mood to keep your morale up while dieting

To achieve these goals, PhenQ uses a trademarked fat-burning formula called α-Lacys Reset®, which works by activating the enzyme AMP-kinase for thermogenesis.

Also, PhenQ contains other natural ingredients that attack belly fat, including Capsimax, an established concoction of compounds that facilitate weight loss. This powder blends capsicum, piperine (black pepper), caffeine, and niacin (vitamin B3) to reduce abdominal fat.

Wolfson Berg Limited consulted nutritionists, health experts, and fitness professionals while developing the PhenQ ingredient list:

• α-Lacys Reset®
• Capsimax powder
• Chromium picolinate
• Caffeine
• Nopal

To shed excessive body weight with PhenQ, take the weight loss pill once in the morning and again at lunchtime.

Men and women looking for fat burners to help them achieve a dramatic weight loss transformation can end their search with PhenQ. This one fat burner does everything you need to kick your body’s fat-burning capabilities into high gear.

• Powerful five-in-one weight loss formula
• Over 190,000 satisfied customers
• Huge savings when buying more than a one-month supply
• 60-day money-back guarantee

Click Here for the Lowest Price on PhenQ

#2 Leanbean: Best for Active Women

Leanbean is our choice for the top thermogenic fat burner for women. In a world full of fat burners geared towards gym bros and their gains, trusted U.K.-based Ultimate Life Ltd developed the best fat burner for women who want to keep fit: Leanbean.

Women everywhere echo Leanbean’s claims that this weight loss supplement engineered for the female body helped boost their metabolism, banish their cravings between meals, and give them an energy boost for their workouts.

Unlike male fat burners, Leanbean doesn’t contain stimulants like caffeine, which can cause adverse side effects in women like nausea and jitters due to their hormones and lower body mass. Instead, Leanbean uses other thermogenic ingredients like turmeric and choline to amp up your body’s fat-burning process.

For appetite suppression, Leanbean provides a hefty dose of a fiber called glucomannan, and the fat burner also includes a B-vitamin complex to give you more energy to push through even your toughest gym sessions.

In total, the Leanbean formula contains 12 fat-burning ingredients:

• Glucomannan
• Choline
• Chromium picolinate
• Vitamin B6
• Vitamin B12
• Chloride
• Zinc
• Green coffee
• Turmeric
• Garcinia cambogia
• Acai berry
• Piperine

Leanbean recommends taking two pills with a glass of water three times throughout the day, preferably about 30 minutes before each meal.

If you’re a woman who specifically wants a fat burner for women, you’ve found the best one in Leanbean. After several weeks of taking Leanbean, stepping onto the beach in a new bikini will feel better than ever.

• Provides a clean energy boost without harmful stimulants
• Kickstarts your metabolism so you can finally achieve your body goals
• Specifically made for the female body
• 90-day money-back guarantee

Click Here for the Lowest Price on Leanbean

#3 Burn Lab Pro: Best Ingredients

In 2019, British supplement manufacturer Opti-Nutra Ltd added Burn Lab Pro to its suite of “Lab Pro” products. The brand claims that its fat-burning formula will help people of all genders lose fat and pack on muscle—without using stimulants like caffeine.

When designing Burn Lab Pro, Opti-Nutra Ltd swapped common caffeine-filled fat-burner ingredients like green tea for substances that provide an energy boost without the headaches, anxiety, and racing heartbeat that caffeine often brings.

For example, Burn Lab Pro contains a high amount of HMB, a compound that helps build an essential amino acid called leucine. As an amino acid, leucine may contribute to energy production, but the HMB itself comes with health benefits, too.

Scientists believe that this compound helps preserve muscle mass as well as grow it, even in the face of a caloric deficit. Plus, HMB may even improve your performance in the gym. Honestly, we’re surprised that more fat burners don’t include this ingredient in their formulas.

Additionally, Burn Lab Pro includes thermogenic ingredients like cayenne pepper, appetite-suppressing ingredients such as ForsLean from the Coleus forskohlii root, and other compounds for absorption and strength.

Take a look at the full list of Burn Lab Pro’s natural ingredients:

• HMB (β-Hydroxy β-Methylbutyrate)
• Calcium
• Capsimax cayenne pepper extract
• ForsLean (Coleus forskohlii root)
• Nutrigenesis GTF chromium
• BioPerine black pepper extract

Before your daily workout, take two pills to burn fat with Burn Lab Pro—it’s that easy.

If you’re looking for a clean formula that delivers fat-burning results without caffeine-related side effects, then Burn Lab Pro deserves a space in your medicine cabinet.

• Helps shed more body fat from every workout
• Get better results than diet and exercise alone
• Clean formula with no stimulants or synthetic additives (gluten-free)
• 30-day 100% money-back guarantee

Click Here for the Lowest Price on Burn Lab Pro

#4 Phen24: Best for Boosting Metabolism

Another Wolfson Berg Limited Product, Phen24, exists to help people reinvigorate their metabolism at all hours of the day—even during sleep. As a result, you should start to see the unwanted fat melt away.

Unlike other fat burners, Phen24 pays special attention to the stress hormone cortisol. Your body releases cortisol when you start your day, but if the cortisol persists into the night due to stress, the excess can cause slow metabolism and, thus, weight gain.

Therefore, your metabolism operates in two phases: daytime and nighttime, each with different needs.

To accomplish these two sets of goals, the innovative Phen24 regimen includes two different pills: one for the morning and one for nighttime.

During the day, PhenQ’s thermogenic ingredients like cayenne pepper promote the conversion of food into energy to directly accelerate your metabolism, and a dose of caffeine gives you an energy boost as you go about your day.

At night, PhenQ uses ingredients such as Griffonia extract to reduce cortisol levels, which will curb sugar cravings to prevent nighttime binging and help you sleep better so that you will have more energy the next morning.

Daytime formula ingredients include:

• Zinc
• Manganese
• Copper
• Iodine
• Caffeine
• Guarana extract
• L-phenylalanine
• Cayenne powder

Nighttime formula ingredients include:

• Ascorbic acid (vitamin C)
• Calcium d-pantothenate
• Pyridoxine HCl
• Chromium picolinate
• Thiamine HCl
• D-biotin
• Molybdenum
• Glucomannan
• Griffonia extract
• Green tea extract
• Hops extract

In the morning, take one Phen24 day capsule with breakfast. Then in the evening, take two Phen24 night capsules, with a glass of water or two, approximately 15 minutes before dinner.

If you believe that stress and low metabolism are responsible for your inability to lose weight, you should give Phen24 a try.

• Boosts metabolism 24/7
• Contains natural ingredients
• Provides free delivery worldwide
• Comes with a 60-day money-back guarantee

Click Here for the Lowest Price on Phen24

#5 Instant Knockout: Best for Men

As the supplement’s name implies, Roar Ambition Ltd originally developed Instant Knockout in England for MMA fighters—it even comes in a bottle shaped like a fist. However, you don’t have to be a professional boxer to reach fighting weight using this fat burner for men.

When you take Instant Knockout, you’ll maximize your fat metabolism with thermogenic ingredients, including green tea, suppress your appetite with glucomannan, and boost your energy for the gym with a jolt of caffeine.

Instant Knockout contains a total of 10 ingredients:

• Caffeine anhydrous
• Cayenne powder
• Glucomannan
• Green coffee extract
• Green tea extract
• GTF chromium
• Vitamin B6
• Vitamin B12
• Zinc
• Piperine

Four times throughout the day, open Instant Knockout’s fist-shaped bottle and pop one of the capsules with a glass of water just before your meal or snack. Just make sure you don’t take the fourth pill too late in the evening, or its caffeine may keep you from sleeping.

Although Instant Knockout claims that its formula is unisex, we think that men will especially love this fat burner for its muscle-building results.

If you’re a vegetarian or vegan, however, be aware that the capsules contain gelatin.

• One of the best fat burners for men
• Thermogenesis helps burn the most stubborn body fat
• High-quality, all-natural ingredients
• Money-back guarantee

Click Here for the Lowest Price on Instant Knockout

How We Chose the Best Fat Burners

Ingredients

Before recommending any of these thermogenic fat burners to you, we read their nutrition labels carefully to make sure that they each contain proper weight loss ingredients, not empty filler ingredients like magnesium stearate and vegetable gum.

We also kept an eye out for banned ingredients like ephedra, sibutramine, or fenfluramine. Because the U.S. Food and Drug Administration doesn’t regulate supplement manufacturers as strictly as pharmaceuticals, sometimes manufacturers get away with including ingredients in their products that could negatively impact your health.

Generally, we’ve found that the most effective weight loss pills use as few synthetic ingredients as possible because they tend to cause more side effects than natural ingredients. Every fat burner on our list contains mostly—if not completely—natural ingredients.

Most importantly, you want a weight loss supplement filled with ingredients that have shown the ability to help your body burn fat.

Dosage

Researchers recommend particular amounts of particular ingredients for a reason. If a supplement provides a key ingredient in an amount that’s only a fraction of the recommended dose, then what’s the point?

Therefore, we aimed to choose fat burner supplements with formulas that include high-enough amounts of fat-burning ingredients to help you lose weight.

To ensure that you get enough of each ingredient, we steered clear of supplements with proprietary formulas. Because a proprietary formula only lists the ingredients in weight order instead of disclosing the exact amounts, a manufacturer can stretch the truth regarding their products' content.

If we don’t know the dosage, we can’t say whether the fat burner works. We want you to know exactly how much of each ingredient you’re getting.

Price

The price tag on a weight loss supplement will depend on several factors, including the dosage of research-backed ingredients, the number of pills per bottle, and the brand’s reputation. This means you can expect that the most effective fat burners probably won’t come cheap.

That said, while the monthly price of weight loss supplements usually ranges anywhere from $10 to over $70, the best fat burners don’t always hit the high end of this spectrum. When making our list, we tried our best to include a thermogenic fat burner for every budget.

In the end, only you can decide how much you’re willing to spend on a thermogenic fat burner. Fortunately, most brands offer major discounts on their official websites, and you can usually maximize your savings by buying in bulk.

Advertised Benefits

When we compiled all of the best weight loss supplements on the market, we made sure to look for fat burners that claim to provide the health benefits you’re seeking, such as belly fat loss, appetite suppression, boosted metabolism, and increased energy levels.

At the same time, we passed on fat burners with promises that sounded too good to be true. If a brand makes lofty claims about losing weight instantly, the supplement probably doesn’t work without any diet or exercise.

Instead, we only included weight loss pills with results that sounded realistic.

Customer Reviews

When we evaluated each thermogenic fat burner, we read a variety of positive and negative customer reviews to get a better idea of whether or not the supplement works. A brand will always say good things about its product, but real people with real weight loss goals provide the objective insight you need to help you make your decision.

Of course, everyone has different body compositions, so keep in mind that a fat burner that worked spectacularly for one person might not give you the same results.

How Do Thermogenic Fat Burners Work?

Thermogenesis

The word “thermogenic” comes from the word “thermogenesis,” which refers to the production of heat in the body. For fat loss to occur, your body has to burn calories through thermogenesis.

Your body naturally burns calories throughout the day through regulatory functions such as breathing and keeping your organs functioning. Still, the process accelerates when you increase your energy expenditure during exercise.

A fat burner increases thermogenesis because it provides ingredients, such as caffeine and cayenne pepper, that induce the calorie-burning process by raising your body temperature. As a result, your metabolism speeds up, and your body burns stubborn body fat.

Fat Oxidation

Remember, fat does serve a purpose: Your body stores it to use as energy in the future. However, certain fat burner ingredients like green tea extract can encourage your body to oxidize—in other words, use—the stored fat.

Appetite Suppression

Lastly, thermogenic fat burners facilitate weight loss by helping you eat less. Weight loss pills typically have high concentrations of fibers like glucomannan. Because fiber takes longer to pass through your digestive system, you’ll feel fuller for longer and experience fewer hunger cravings that compel you to grab a snack.

A weight loss supplement also suppresses your appetite by dulling the signals of key hunger hormones. For instance, stimulants such as caffeine impede the production of ghrelin, the hormone that tells your brain that your stomach is empty.

Top Ingredients Found in the Best Fat-Burning Supplements

Caffeine

The chances are that you already consume caffeine—the world’s most commonly ingested psychoactive substance—whether through coffee, green tea, soda, or dark chocolate.

When you think of caffeine, the energy boost this nerve stimulant provides likely comes to mind. After all, it’s the reason why most people drink caffeinated beverages. Caffeine increases your energy levels by activating the release of neurotransmitters that reduce fatigue. This increase in alertness will help you push through your most strenuous workouts.

In addition to its energy-boosting properties, many weight loss pill formulas include caffeine due to the way it blocks a nervous system depressant called adenosine, causing the release of fat-burning hormones like norepinephrine to increase.

As a result, your metabolism will increase as well, even when you’re at rest. In fact, a study revealed that a 100 mg dose of caffeine could boost your resting metabolic rate by up to four percent, helping you burn more calories.

Green Tea Extract

Packed with antioxidants called catechins, green tea makes an effective diet pill ingredient in addition to a healthy drink. The principal catechin in green tea, epigallocatechin gallate (EGCG), increases the rate at which the body converts fat into fatty acids by 15%. In particular, green tea extract decreases your body’s levels of triglycerides, one of the main types of body fat.

Green tea extract can also boost metabolism by increasing the body’s production of fat-burning hormones such as norepinephrine. Of course, green tea also contains caffeine, which will help tamp down your appetite and give you the energy boost you need to burn more calories during your workouts.

Conjugated Linoleic Acid (CLA)

One of the most common omega-6 fatty acids, CLA, naturally occurs in some animal products like cheese and butter. In research, CLA has demonstrated an ability to reduce body fat, increase muscle mass, and suppress appetite.

In one 13-week study, 54 people who took 3.6 grams of CLA daily reported feeling less hungry than people taking a placebo.

Garcinia Cambogia Extract

Also known as Malabar tamarind, this small, green, pumpkin-shaped fruit grows in Indonesia. The skin of the Garcinia cambogia contains a chemical called hydroxycitric acid, which manufacturers often add to appetite suppressants since it curbs cravings by boosting serotonin.

Hydroxycitric acid also contributes to thermogenesis by encouraging the body to convert stored fat into energy.

Green Coffee Bean Extract

Did you want to know something surprising? Before they’re roasted, coffee beans have a green hue. You also probably didn’t know that they get most of their caffeine through the roasting process.

However, unroasted, green coffee beans contain a helpful antioxidant that we don’t get from the coffee we drink: chlorogenic acid. Chlorogenic acid in green coffee bean extract can improve your overall health by lowering your cholesterol levels and blood pressure.

Glucomannan

Extracted from the East Asian konjac root, this ingredient plays a key role in appetite suppression. Upon contact with water, glucomannan absorbs the water and swells to form a dense, gel-like fiber that takes up space in your stomach, helping you feel fuller for longer. A study by the European Union revealed that you need to take three grams of glucomannan to impact your appetite.

Raspberry Ketones

Raspberry ketones give raspberries their distinct aroma. A study on fat cells from mice and another on rats revealed that raspberry ketones can boost fat metabolism and increase levels of a hormone called adiponectin that regulates blood sugar levels.

Because you’d need to harvest 90 pounds of raspberries to get one dose of their ketones, scientists have created a synthetic version of the substance to use in weight loss supplements.

Who Should Use a Fat Burner for Weight Loss?

Anyone who has struggled to lose weight with diet and exercise alone can benefit from taking a fat burner. That said, make sure you don’t quit your current efforts. Thermogenic fat burners work best as part of a complete weight loss program including a healthy diet and exercise.

As long as you take the weight loss pills as directed and maintain a healthy lifestyle, you should start to see that fat disappear in no time.

Ready to take the next step in your weight loss journey? Discover the best fat burner supplement for you today from among those that we've recommended.