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Best Calorie Deficit Fat Burners for Women [Updated 2021]

Reaching a calorie deficit is the holy grail of burning fat, but is easier said than done. Luckily, there are products on the market that can give you the edge. We've rounded up the very best, right here! Read on to find out more.

**Updated for 2021**

Trying to lose weight but not seeing any results? Don’t worry, you’re not the only one. We would all like to lose a few pounds, but it’s easier said than done!

It’s also a fact that women find it harder to burn fat than men, meaning we have to work even harder to keep off the belly fat.

You’re exercise routine is on point, you’re controlling your diet, but you’re still not losing weight. What gives?

What is a calorie deficit?

The only real way to lose weight is to consume less calories than you burn in a day. Your body will use your stores of fat for energy and you’ll start to lose weight as a result. A calorie is a unit of energy, so you need your body to use this energy to lose the weight.

This is known as a calorie deficit and it’s the key to fighting fat – and keeping it off.

Obviously, your main tools are going to be lots of healthy, low calorie natural foods, to keep your intake at a minimum.

Secondly, you’re going to benefit from lots of exercise. Running, lifting, swimming or just about anything else is great to get your body using its fuel up.

You can also buy many different types of supplements that contain ingredients which could help you achieve your dream weight target.

We’ve rounded up the top 5 fat burners on the market which could help you achieve a calorie deficit. Take a look.

Discover the best fat burners for women in 2021


1) Instant Knockout CUT

Instant Knockout CUT

At the top spot is Instant Knockout CUT. 

This is a fat-burning supplement that’s been on the market for a long time now. It was originally designed to help MMA fighters and boxers lose fat and get lean before weighing in for a fight. Can it do the same for you?

Instant Knockout CUT isn’t just for the professionals – it’s for anyone. It claims to slow down or stop fat-storing by:

  • boosting metabolism
  • suppressing appetite
  • giving you the energy to perform a more intense workout

Although designed for pro-MMA fighters, we think this formula could be ideal to help any women melt away those last few inches of unwanted fat. Even better, the capsules are suitable for vegetarians and vegans.

Read on to find out.

What’s in Instant Knockout CUT?

1. Green tea extract

We know this is one of the most effective thermogenic ingredients on the market[1]. A resounding 11 independent trails identified fat-burning properties in green tea extract.

2. Cayenne Pepper Seeds

Not only are cayenne pepper seeds full of vitamins, we also know this ingredient as a potent thermogenic, effective at boosting your metabolic rate[2].

3. Glucomannan

Glucomannan is also known as konjac root extract. When it hits your stomach it expands, making you feel fuller, suppressing your appetite and reducing the risk of hunger-induced cravings or over-eating[3].

4. Caffeine Anhydrous

Caffeine is common in fat-burners and we’re always wary of products that just pump their weight-loss pills full of it. However, with Instant Knockout CUT, the stimulant is at a much lower dosage than other fat-burners and is added with the aim of improving focus and energy[4].

5. Vitamin B6

In a controlled clinical trial, B6 or pyridoxine was shown to increase fat oxidization which can directly contribute to weight loss[5].

6. L-Theanine

L-Theanine – this amino acid works alongside caffeine to enhance the stimulant’s benefits, for improved focus, drive and energy[35], whilst keeping negative side effects like jitters at bay. It’s also a proven appetite suppressant[36] and has stress-fighting abilities too[37].

[Related Article: Read our full Instant Knockout CUT review here]

IngredientsAmount per serving
Vitamin B6 (Pyridoxine Hydrochloride)5mg
Vitamin B12 (Cyanocobalamin)10mcg
Vitamin D3 (Cholecalciferol) (vegan) 45mcg
Green Tea Extract 500mg
Cayenne Pepper 100mg
Glucomannan (Konjac Root)1800mg
Caffeine (Caffeine Anhydrous)300mg
Black Pepper Extract (Standardized to 95% PE)10mg


How to take Instant Knockout CUT

  • One capsule immediately after waking up, before breakfast
  • One capsule between breakfast and lunch
  • One capsule an hour after lunch
  • One capsule an hour before your evening meal

How much is Instant Knockout CUT?

  • $59/£35 for one bottle
  • $118/£70 for two bottles
  • $185/£110 for three bottles + one free bottle + free delivery

What are people saying about Instant Knockout CUT?

It’s not just the professionals who love Instant Knockout CUT. We found a huge number of positive testimonials, indicating how successful the supplement can be when accompanied by the right diet and exercise.

What’s more, the support for this fat burner from high-profile sportspeople is overwhelming. In particular, UFC fighters like John Dodson, Holly Holm, and Diego Sanchez have recommended the supplement.


Read more real life Instant Knockout CUT reviews



  • Combines intelligent ingredients
  • Uses multiple approaches to control diet and burn fat
  • The formula is completely natural and safe
  • Very low risk of side-effects
  • No proprietary blends
  • Vegan-friendly capsules
  • Backed by scientific research and studies


  • Premium product attracts a premium price


When accompanied with a calorie-restricted diet and an active lifestyle, we think you’ll struggle to find another fat burner as effective as Instant Knockout CUT.

It’s free of unknown synthetic chemicals, it’s completely safe and every ingredient in the formula is proven to aid the fat-burning process. No fillers in sight.

It’s a high-quality supplement that’s worth paying a little extra for.

Total score

Buy Instant Knockout CUT now


Buy Instant Knockout CUT Now


2) Hourglass Fit

Hourglass Fit Bottle & Supplement Facts

In second place is women’s only fat burner, Hourglass Fit. 

The manufacturer has crafted a completely natural formula, containing a number of key ingredients that work together to provide you with a comprehensive dieting support system. It claims to:

  • Boost metabolism
  • Crush cravings
  • Improve how your body stores/burns fat
  • Give you a new body confidence

Every ingredient is high-grade and should help you maximize the results from your diet and active lifestyle. Although we can see thermogenic and appetite suppressants in the mix, we did notice the supplement is free of added stimulants, so we were intrigued to see how it provides energy.

Overall, we were impressed by the quality of the formula – it’s one of our favorites. Want to know why? Keep reading.

What’s in Hourglass Fit?

1. Vitamins B2, B6 and B12

Scientific research has shown that Vitamin B6 can increase fat burn by helping the body use more stored glycogen as an energy source. It also improves the way your body uses carbohydrates, so they’re less likely to be held as fat[6]. Vitamin B2 and B12 also work to break down food properly and can help ensure you have a steady flow of energy throughout the day [34].

2. Glucomannan

Countless studies have linked glucomannan or konjac root extract to weight loss and diet control. Science has shown it significantly reduces hunger and cravings[7].

3. Capsimax®

This is a concentrated version of the thermogenic chili pepper ingredient we’re used to seeing in natural fat burners[8].

4. 5-HTP

5-HTP is a potent amino acid that is linked to boosting levels of the neurotransmitter serotonin. This neurotransmitter has a hand in regulating appetite and mood. 5-HTP has been said to counteract hunger hormones too, helping you stay on track with your calorie intake[9].

5. Chromium

This ingredient contributes to improving the way your body uses and stores the carbohydrates you consume, so you store less fat[10].

[Related Article: Read our full Hourglass Fit review here

Ingredients Amount per serving
Vitamin B6 1.7mg
Vitamin B12 2.4µg
Chromium (as Chromium Picolinate)125µg
Zinc (as Citrate) 8mg
Vitamin B2 1.1mg
Cayenne Pepper Extract100mg
Black Pepper Extract5mg
5-HTP (Griffonia simplicifolia extract)150mg


How to take Hourglass Fit

  • First capsule 30 minutes before breakfast
  • Two capsules 30 minutes before lunch
  • Third capsule 30 minutes before an evening meal

How much is Hourglass Fit?

One bottle of Hourglass Fit is priced from: $50/£30

What are people saying about Hourglass Fit?

Accompanied by the right diet and exercise, some women say they have seen and felt the difference after two weeks. Those who’ve reviewed it say it’s helped them curb cravings, jumpstart their metabolism and boost energy.

Read more real life Hourglass Fit reviews



  • Caters to the dieting needs of women
  • Enhances results of a healthy diet
  • Completely natural ingredients
  • Low risk of side-effects
  • Stimulant free
  • Various deals and offers
  • Vegan friendly
  • FREE UK & US delivery


  • More expensive than most
  • No added stimulants if you prefer a kick


The combination of powerful ingredients within this supplement work together to provide a support system for female dieters. It’s well dosed and contains a number of our favorite ingredients, which are all backed by research. Even better, the capsules are made from vegetable cellulose making them suitable for vegans.

Total score


Buy Hourglass Fit now


Buy Hourglass Fit Now


3) Hunter Burn

Hunter Burn Fat Burner

Compared to other formulas on this list, Hunter Burn is a very different kind of weight loss aid.

Part of the Hunter suite of supplements, Hunter Burn is a premium fat burner designed to complement the lives of busy women and men.

What’s in Hunter Burn?

1. Konjac Root Extract

Science shows konjac root extract, or glucomannan expands when it hits your stomach[11]. This makes you feel fuller and therefore suppresses appetite, so you feel less inclined to snack or over-eat.

2. Vitamin D3

Although an unusual addition to a fat burner, after research, we found the vitamin is linked to fat loss. It also helps to maintain muscle, which is key to increasing metabolism and maintaining healthy body composition[12].

3. Matcha Green Tea

Science shows this popular form of green tea us up to three times more powerful than other well-known strains and offers extremely potent thermogenic properties[13].

4. L-Theanine

L-theanine is widely known for creating a sense of focused calm. Scientific research has also discovered it can reduce fat build-up and improve your ability to resist hunger cravings[14].

5. White Kidney Bean Extract

If the konjac root doesn’t do its job, the manufacturers of Hunter Burn have created an additional buffer for damage control. This is a carb-blocker, which reduces the amount of carbohydrates you absorb when you eat them[15].

6. Cayenne Pepper

This ingredient is a well-known thermogenic, common in effective fat burners. It boosts your metabolism and gets your body working hard to burn calories faster[16].

[Related Article: Read our full Hunter Burn review here]

IngredientsAmount per Serving
Vitamin D3 (as Cholecalciferol)3000IU
Konjac Root Extract (Amorphophallus konjac) (Standardized to 90% Glucomannan)3000mg
White Kidney Bean 20:1 Extract (Phaseolus vulgaris)500mg
Matcha Green Tea (Camellia Sinensis)200mg
Cayenne Pepper125mg


How to take Hunter Burn

  • Two capsules, 30 minutes before breakfast
  • Two capsules, 30 minutes before lunch
  • Two capsules, 30 minutes before dinner

How much is Hunter Burn?

  • $75/£55 for one bottle
  • $150/£110 for two bottles + free delivery
  • $225/£165 for three bottles + one free bottle + free delivery 

What are people saying about Hunter Burn?

Some reviewers say Hunter Burn has helped raise their energy levels, diminish hunger pangs and cut excess fat. With this fat burner, motivation also appears to peak – with more users feeling determined to continue improving their physique.

Read more real life Hunter Burn reviews



  • Supports all stages of the fat loss process
  • Gives you the tools to stick to a diet
  • Promotes healthy fat loss
  • Completely natural formula
  • Low risk of side-effects
  • Transparent formula, free of proprietary blends


  • One of the most expensive fat burners on the market
  • No added caffeine if you prefer a bigger boost 


Although the supplement profile looks a little different to others, the intelligence of this formula combined with the potency of the natural ingredients puts Hunter Burn right up there as one of our favorite fat burner supplements.

Total score


Buy Hunter Burn now


Shop Hunter Burn Now



4) Leanbean Fat Burner

Leanbean Fat Burner

In fourth place is a specifically female fat burner, Leanbean.

Originally designed to give female fitness models a helping hand with their fat loss phase, it’s grown in popularity both for athletes and normal women looking to drop a few pounds. Of course, all alongside exercise and a healthy eating regime.

It comes with an all-natural profile and claims to be completely tailored to women and their physical make-up to maximize results. Leanbean should:

  • help reduce tiredness and fatigue
  • manage food cravings
  • support fat metabolism
  • help maintain a healthy diet

What’s in Leanbean?

1. Konjac Root Fiber

Also known as glucomannan, science shows konjac root is a powerful appetite suppressant. As a natural fiber, it works by expanding in the stomach, ultimately making you feel full[17]. This is essential for women, as cravings can often mean the end of a diet for us.

2. Turmeric

The makers have used natural spice turmeric because of its powerful anti-inflammatory and anti-obesity properties. Turmeric contains curcumin which suppresses the growth of fatty tissue[18] and reduces inflammation[19], enabling the body to work better.

3. Garcinia Cambogia

This clever natural ingredient is proven to help your body naturally produce serotonin, which can help to suppress your appetite and kick cravings to the curb[20].

4. Green Coffee

Before they’re roasted, your coffee beans are green and packed with antioxidants and chlorogenic acid. These are scientifically shown to reduce fat absorption and lower blood sugar, along with giving you an energy boost from the caffeine within the beans[21].

[Related Article: Read our full Leanbean review here

Ingredients Amount per Serving
Vitamin B61.7mg
Vitamin B122.4mg
Green Coffee50mg
Acai Berry20mg
Turmeric Root50mg
Garcinia Cambogia100mg
Black Pepper5mg

How to take Leanbean

Leanbean manufacturers advise you to take one capsule four times a day to get the best results.

How much is Leanbean?

  • $59/£39 per bottle
  • $118/£78 for two bottles
  • $185/£117 for three bottles + one free bottle + free delivery + free e-book workout guide

What are people saying about Leanbean?

Overall, we found Leanbean to be well received by a lot of women looking to lose weight.

From what we’ve seen, those who’ve reviewed it say it’s helped to subdue cravings, boost energy and even help to keep their mood high throughout the process.

Read more real life Leanbean reviews


  • Uses only natural ingredients
  • Intelligent formula that addresses women’s issues
  • Completely safe
  • No proprietary blends
  • Backed by science


  • More expensive than other similar products
  • Some ingredients slightly under-dosed


When it comes to female-focused fat burners, Leanbean is high on the list of the most effective on the market.

The value for money is good, although this supplement is still not the cheapest available at $59/£39. Having said that, it’s a premium product that should deliver.

Total score


Buy Leanbean now


Buy Leanbean Now



5) Burn Lab Pro

Burn Lab Pro

Hailing from one of the most trusted labs in the world of supplements is Burn Lab Pro.  

The creators claim it’s designed for performance, to accompany an active lifestyle. It claims to do this by:

  • raising metabolism
  • maintaining muscle
  • controlling hunger
  • supporting fasted training

We can see it misses out a number of key ingredients that we know make top-quality supplements. For example, we know that glucomannan is the most effective natural appetite suppressant available.

What’s in Burn Lab Pro Fat Burner?

1. HMB (ß-Hydroxy ß-Methylbutyrate)

This is a metabolite of the branched chain amino acid leucine and has been shown to optimize the results of fasted training. It stops muscle-damaging enzymes and promotes muscle growth[22].

2. Coleus Forskohlii

This root herb contains an active ingredient called Forskolin. It has been shown to promote the activation of cAMP[23], which helps to regulate metabolism, thermogenesis and muscle growth.

3. Cayenne Pepper Extract

Cayenne pepper extract has been proven to increase metabolism and enhance energy expenditure so you burn more calories than you normally would[24]. It’s also proven to improve fat oxidization, so your body draws on fat cells for fuel.

4. Black Pepper Extract

This helps to optimize the thermogenic benefits of the other ingredients, and slows adipogenesis, which is the formation of new fat cells[25] [25].

Ingredients Amount per serving
HMB (ß-Hydroxy ß-Methylbutyrate)1500mg
Coleus Forskohlii375mg
Cayenne Pepper Extract75mg
Black Pepper Extract3.75mg

How to take Burn Lab Pro Fat Burner

Performance Lab suggests you take 2-4 pills 15 minutes before your workout.

How much is Burn Lab Pro Fat Burner?

$50/£40 for one bottle

Note: The manufacturers recommend you take between two and four capsules per daily serving. With 60 capsules in a bottle, it should last a month with just two a day. However, if you find you need four, you’re cutting your number of servings in half, which will significantly affect the overall value of the supplement.

What are people saying about it?

As a well-established supplement and company, Performance Lab’s SPORT Fat Burner has plenty of reviews online.

Our impression of the supplement from reviewing testimonials was overwhelmingly positive. Many enjoyed the fact this supplement is stimulant-free and supports the effects of fasted training.


  • Completely natural formula
  • High-quality ingredients
  • Safe to use
  • No proprietary blends
  • Backed by science
  • Stimulant free


  • No appetite suppressants
  • No caffeine if preferred
  • Low thermogenic levels


While this product might not be the best all-rounder, it definitely offers a range of benefits that could increase your ability to cut fat.

Its power to enhance results from fasted training will suit many women very well. However, the lack of appetite suppressants or stimulants might not make it the best option for the majority.

Total score


Buy Burn Lab Pro Fat Burner now


Shop Burn Lab Pro Fat Burner Now


Final Word

Overall, we highly recommend these five effective calorie deficit fat-burners for women.

While Instant Knockout comes out on top, there are others like Hourglass Fit that have different qualities, so choose the one that works for you.

They all contain high amounts of ingredients that could help you achieve a calorie deficit and compliment your diet and exercise.

Rest assured that we’ve selected the best on the market with all natural ingredients, from established brands.

You can buy our number 1 pick, Instant Knockout Cut, by clicking below.

Shop The Best Fat Burner for Women Now

at Instant Knockout


Disclaimer:  The information on this site has not been evaluated by the FDA. The products on this page are not intended to diagnose, treat, cure or prevent any disease. Results in description and Testimonials may not be typical results and individual results may vary. We may earn a commission if you click the links and buy the products featured on this page.









[7] As source 3




[11] As source 3





[16] As source 2

[17] As source 3







[24] As source 2














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