If you’re thinking about using fat burners, the first question you probably have is: do they work? In short, fat burners do work, depending on the product you choose. To make things easier, we have made a list of the best ones that have proven benefits and are appropriate for women. 

We have done the hard work for you and analized some of the best and most popular products and supplements out there. We looked at the ingredients, proven benefits, dosages, online reviews and much more to determine the absolute best fat burners. After careful consideration, we’ve found the best fat burners for women in 2021 to be:

Top 3 Fat Burners



   Best Overall  





   Best for cravings   




Instant Knockout

   Best for active women   



PhenQ: Best Overall Fat Burner for Women

PhenQ  is one of the most popular dietary supplements for women, and it is used by people all over the world to lose weight faster and get rid of unwanted fat. It is manufactured by Wolfson Brands, leaders in the supplement industry for over 10 years and company that has created some of the best high-quality weight loss products on the market.

PhenQ is a thermogenic fat burner, which means that it makes the body burn more calories by increasing its heat levels. Similar to how the body burns fat when undergoing exercise, PhenQ’s formula increases your body’s burn rate to give you the ultimate fat burning effect. 

The blend of natural yet powerful ingredients in PhenQ combines 5 supplements in 1, and each ingredient has been researched and gone through extensive testing to ensure it assists with weight loss. They do this by increasing the body’s ability to burn fat and reducing new fat cells from being produced, and they also work by lowering your appetite and controlling cravings, boosting energy levels and improving focus. 

PhenQ’s scientific research indicates that any adverse effects are rare and very short-lived, and hundreds of overwhelmingly positive reviews from women all around the world report it as a safe supplement with little to no downside and impressive benefits.  

Related articles: PhenQ Review

  P R O S 

  • Natural ingredients backed by science and research
  • Helps burn fat and stop production of new fat cells.
  • Considered to be 5 supplements in 1
  • Improves energy and mood
  • Increases mental alertness.
  • Anti-aging effects.

  C O N S

  • Caffeine content may affect sleep quality

Leanbean: Best For Controlling Cravings

Leanbean is a natural and vegan-friendly dietary supplement that has a reputation for being one of the most effective fat burners available, which is why it’s at the top of our list. It was made with a proven fat-burning formula that put focus on ingredients that aid weight loss by reducing hunger and controlling cravings, while also combatting tiredness, fatigue, and boosting the body's metabolic rate.

Leanbean doesn’t contain any stimulants and it has very low levels of natural caffeine. Instead, it contains Glucomannan, which has already been approved as a weight loss solution in the EU. This natural fiber reduces your appetite by making you feel full for longer and, therefore, your calorie consumption, which means your body will have fewer calories to convert to fat. By helping you to cut your calorie intake, Leanbean facilitates weight loss and helps you to achieve your goals.

In addition to this, Leanbean also contains Choline and Chromium. Choline is known to increase the body’s fat burning metabolism, while Chromium helps to regulate blood sugar levels and keep them within a normal range. As a result, Leanbean can help you to lose weight more quickly, avoid cravings and maintain healthy blood sugar levels.

When used as part of a healthy lifestyle, Leanbean reduces your appetite so that you’ll  be satisfied with smaller meals and gives your body a metabolism boost so it burns more calories throughout the day. As a result, Leanbean will promote weight loss and help you to maintain a healthy weight.

Related article: Leabean Review 

  P R O S 

  • Highly effective appetite suppressant
  • Helps combat sugar cravings
  • Positive reviews from hundreds of customers 
  • Lack of side effects

  C O N S

  • Needs to be taken 3 times a day for best results

Instant Knockout: Best For Active Women

instant knockout

Instant Knockout was originally developed for MMA fighters and professional boxers that needed a high level of energy to increase their athletic performance, while also reducing appetite and boosting their metabolism to burn fat and build muscle. 

This product uses natural ingredients that help activate thermogenesis, which increases the body heat to get it to maximise the calories burnt. The nutritional ingredients include vitamins, minerals and stimulants components that have scientific evidence and have been proven to help boost physical performance. It also contains 350 milligrams of caffeine per daily serving, which is great for some people looking to get energy to work out, burn fat and increase muscle mass, however, some people struggle with that amount and it might affect their sleeping patterns.

One of the great things about Instant Knockout is that it improves insulin sensitivity, making it suitable for diabetics, and the product has even been recently redesigned to be suitable for vegans and vegetarians.

Instant Knockout is very effective for stopping the process of fat accumulation and with an all-natural ingredient list, it’s safe for many diets. As this product was designed for more athletic individuals, it can certainly help you burn more fat while you exercise while keeping your appetite at bay.

  P R O S 

  • Provides energy for better physical performance 
  • 100% natural and vegan-friendly
  • You won’t need a low-calorie diet
  • Fat won’t accumulate as easily

  C O N S

  • Requires a regular workout routine
  • Caffeine content can be too much for people with sensitivity.

Powher: Best Caffeinated Fat Burner

If you are looking for a fat burner that contains caffeine, Powher might be what you are searching for. Powher is based on a unique blend of natural stimulants, fibers and minerals that should enable you to work harder over a longer period of time. In doing so, you’ll burn calories more quickly and lose weight at a faster rate.

Some of its notable benefits include: appetite reduction, increment in metabolic rate and energy levels, it helps maintain a calorie deficit and speeds up metabolism.

Powher contains Glucomannan to help reduce calorie intake, and it also features caffeine. This popular stimulant can boost your energy levels and speed up your metabolism. As a result, you can take your workouts to a new level and burn calories more quickly than before while keeping your appetite and cravings under control, both of which will help you to lose weight.

If you have an active lifestyle or you want to increase the amount of activity you do, Powher’s energy-increasing properties can help you to maintain and enhance your fitness journey

  P R O S 

  • Includes low stimulants for energy and metabolism boosting effects.
  • Optimal dosage of ingredients
  • Natural blend of vitamins and minerals

  C O N S

  • Some may be sensitive to amount of caffeine included

Littledrops: CBD-Based Appetite Suppression

Many people overlook the benefits of CBD when it comes to weight loss. In fact, some people assume that CBD, or cannabidiol, creates food cravings, which isn’t necessarily the case. When you ingest CBD, it can actually reduce cravings and suppress your appetite, which leads to a decreased calorie intake and faster fat loss. 

CBD also increases brown adipose tissue (‘brown fat’). This type of fat helps your body to keep warm and breaks down fat and glucose to do this. As a result, CBD can help you to lose the ‘white fat’ associated with weight gain and obesity by promoting the ‘brown fat’ that helps your body to function. 

If you don’t want to take a pill to assist with fat loss, CBD gummies, like Littledrops, could be the ideal alternative. Each Littledrop gummy contains 20mg of CBD, which is enough to have an impact on your appetite and can help you to burn fat faster.

ShredFIERCE: Best Metabolism Booster

A healthy metabolism is key to successful weight loss and ShredFIERCE can help to boost your metabolism swiftly, which is why we’ve included it on our list of the best fat burners for women 2021. 

This natural fat burner works by reducing appetite levels and therefore calorie intake. It also increases energy to fuel longer and harder workouts, while it helps burn more calories with a metabolism boosting effect. 

It’s easy to assume that ShredFIERCE is designed for men, particularly if you look at their website. However, ShredFIERCE can be used by both men and women, so there’s no need for females to be dissuaded. 

Many people find that ShredFIERCE helps their ‘hack their metabolism’ and achieve their fitness goals more quickly. Although women tend to experience more cravings than men when losing weight, this won’t prevent ShredFIERCE from delivering the results you’re after. If you want to burn fat through an active lifestyle, boost your energy and maximize your workouts, ShredFIERCE could be a great option for you.

Alli: Best For Obese Women

If you’ve already looked into fat burners, you might know that some products are only available via a prescription. Although Alli contains Orlistat, which usually requires a prescription, it’s available to buy over the counter. If you want to try a powerful fat burner without requesting a prescription, Alli have some features you can benefit from. 

Orlistat is a proven fat-burner and designed for people with a BMI of more than 28. Alli contains 60mg of Orlistat, which is around 50% less than you’d find in prescription medications. However, this doesn’t prevent Alli from delivering great results and means you can purchase it over the counter.

Orlistat helps you to lose weight by reducing the amount of fat that the body absorbs via the digestive system. As you aren’t absorbing as much of the fat that you ingest, the body doesn’t need to burn it off. Instead, the body can burn existing fat cells, which leads to a reduction in weight.

However, it’s important to know that Orlistat can cause some annoying side effects in some people, including oily stools, smelly gas and bowel movements that can get hard to control. Due to this, it’s essential to think if this product is for you and if it's what will help you achieve your goals. Make sure you read the instructions before using the product and you might want to seek medical advice before or while using Orlistat for weight loss.

Do Fat burners For Women Really Work?

People are often wary that fat burners are a scam or that they don’t offer genuine results. However, the right fat burner can genuinely help you to lose weight, and all the ones featured on this list have been proven to provide real results. All of these products have a lot of research behind them and the positive reviews from real users confirm their claims about how each can help you lose weight, or improve your performance.

Frustratingly, many other products out there aren’t based on science, which means they don’t always provide the results you’re looking for. 

before & after

How Do Fat Burners Work?

Men and women process and burn fat in virtually the same way but there are minor differences in how male and female bodies do this. Due to this, some ingredients are more effective for women and vice versa. As a result, fat burners that are specially formulated for women are likely to produce the best results for females. 

To find out how most natural fat burners work, take a look at the key mechanisms:

Appetite Suppression

Research suggests that women experience more food cravings than their male counterparts. In fact, studies have shown that females typically experience up to 15.6% more cravings. Many people struggle to beat cravings when they’re trying to lose weight, so it’s important that fat burners for women help to reduce food cravings to facilitate weight loss.

Natural appetite suppressors can work in two ways. Firstly, it can take up space in your stomach, so that you feel fuller for longer and don’t experience hunger as frequently. Secondly, they interrupt the signals sent by your stomach to your brain that tell you you’re hungry. 

Either of these mechanisms can trick your body into thinking it’s not hungry, which means you’ll consume less food. By doing so, your calorie intake is reduced, and weight loss is promoted. Common natural ingredients that are used in fat burners to suppress appetite include:

  • Glucomannan – a natural fiber that expands when it comes into contact with water. When present in the stomach, this takes up more space and leaves you feeling full.
  • CBD – Extracted from the cannabis plant, research has yet to show exactly how CBD suppresses the appetite, but anecdotal evidence suggests this is a common effect.
  • 5-HTP – used in the production of serotonin by the brain. When levels of 5-HTP are increased, your body feels less hungry.

Increase in Metabolism

Your metabolism governs how quickly food is converted into energy, so a faster metabolism means that calories are converted into fuel more quickly, rather than being stored in the body. Some fat burners increase your metabolism by elevating your heart rate, whereas others do so by including various minerals and nutrients. Alternatively, some fat burners may contain stimulants, such as caffeine, that are used to increase your metabolic rate.

However, men and women tend to have different tolerance levels when it comes to stimulants. For example, one study found that women with higher estrogen levels had a lower tolerance to caffeine than men. 

As a result, fat burners for women typically include lower doses of stimulants. Similarly, powerful stimulants, like synephrine and guarana, may not be included in fat burners formulated for women at all. 

Some of the most effective ingredients that are known to increase the metabolism are:

  • L-carnitine – an amino acid that aids in the transfer of fat into energy-producing cells
  • Vitamin B6 – plays an essential role in the metabolic process, so higher levels in the body can speed up the metabolism


When the body produces heat, it uses fat cells as energy. Fat burners that have a thermogenic effect can therefore work more effectively. If the body produces more heat, for example, it uses more energy and burns more fat. 

Many fat burners that promote thermogenesis contain capsaicin, caffeine, green tea extracts and/or turmeric. Studies into these ingredients note that turmeric and green tea has been recognized for its thermogenic effects for centuries. What’s more – green tea extract can help you to burn fat even when you’re at rest, which maximizes the effect and helps you to burn fat faster.

What To Avoid?

Sadly, some manufacturers are more interested in generating revenue than actually delivering results, and even though many potentially harmful products have been removed from shelf and made illegal, there are some people that can sell you counterfeit, which is why it's so important to buy from official sources. 

It is relevant to mention that none of the products on this list contain any of the ingredients mentioned below, and they are all safe to consume.

Here is a list of ingredients that you should steer clear of:

- Ephedra: Increases blood pressure and heart rate, which can lead to unpleasant side effects and increase the risk of strokes and heart attacks.

- 2,4 Dinitrophenol (DNP): A potent metabolism booster, this ingredient can be fatal when it’s used in particular ways. Not only is it extremely dangerous, but it is also illegal, so be sure to report any products you see that contain this ingredient. 

- M-synephrine: Increases blood pressure and heart rate but has a less noticeable effect than Ephedra. However, it can cross the blood-brain barrier, so should be used with caution. Also sold as p-synephrine and o-synephrine, it is not known to be harmful when used in isolation but could be dangerous if combined with caffeine.

ingredients to avoid

Any Side Effects?

As many fat burner ingredients are natural, they do not typically cause many side effects when they’re used appropriately and taken in recommended doses. However, it is still possible that you’ll experience some mild side effects, even when using a natural fat burner. 

Some of the most common fat burner side effects reported include bloating, jitters, diarrhea, and mild gastrointestinal discomfort. 

Jitters occur most frequently when using a product that contains caffeine. Before you use a fat burner or if you experience these side effects, check whether the dosage of caffeine is right for you.

Other side effects often occur because the user exceeds the recommended dose so make sure you stick to the dosage indicated.

FAQs: Fat Burning Products and Supplements

When Should I Use a Fat Burner?

When using any fat burner, it’s important to read the instructions and follow them carefully. However, most fat burners should be taken around 30-40 minutes before a meal. By taking them before a meal, you’re giving them long enough to have an impact on the digestive system. 

If you use a fat burner which contains caffeine, avoid taking this in the evening. Stimulants such as caffeine help to keep you alert which may make it difficult to sleep if you take it too late in the day.

What To Consider When Looking For A Fat Burner?

Although you’ll find hundreds of fat burners online and in stores like Walmart or on sites like GNC and Amazon, you still need to do thorough research to determine which ones are most effective. When you’re choosing which fat burner to purchase, be sure to consider the following:

  • Ingredients – Every product or supplement should have a full list of ingredients, so research what a fat burner contains beforehand and see whether any of the ingredients have genuine fat burning properties.
  • Dosage – The ingredients in a fat burner are important but if only a small amount is included, it may not deliver the desired results. Compare the dosage and determine whether the amount of fat burning ingredients contained in the product are likely to produce meaningful results.
  • Reviews – Check whether a product has online reviews before you decide whether to buy it and, if so, read these carefully to find out what the consensus is. Customers often leave feedback and testimonials, which means online reviews can be a useful way to access the information you’re looking for on a particular fat burner.

As there are so many fat burners on the market, having a checklist makes it easier to compare products. Start with the points outlined above and compare different products to see which ones are the most effective. This gives you the best chance of purchasing a product that delivers results and works best for you.

Do I Need to Exercise While Using Fat Burners?

Many people rely on fat burners in isolation to lose weight, so it’s possible that you will still lose weight, even if you don’t exercise. Providing your body is using more calories than you consume, weight loss should occur. 

Despite this, fat burners are not designed to replace the need for exercise and any products that claim to be a replacement for physical activity are likely to be a scam. There are many benefits associated with regular physical exercise, including weight loss, so try and incorporate activity into your routine, if you’re able to do so. 

What Are Night-Time Fat Burners?

If a product claims to help you burn fat while you’re asleep, it’s known as a ‘night-time fat burner’. The body’s metabolism continues while you’re asleep, so this type of fat burner aims to speed up the process. 

Generally, night-time fat burners have different ingredients to standard fat burners or lower doses of similar ingredients. This is because they are designed to work while you are sleeping and some ingredients, like stimulants, would make it difficult to get to sleep. Night-time fat burners are more likely to contain ingredients that increase your body temperature and plant extracts that promote relaxation, for example. 

Are Fat Burners Safe?

Fat burners are typically safe for the majority of people, providing you use them as directed. 

People sometimes assume that taking higher doses will speed up the process and deliver results more quickly, but this is unlikely. In fact, taking higher than the recommended dosage or using more than one fat burner at a time is likely to cause adverse effects. 

If you’re unsure whether a fat burner is the right choice for you, you should always seek medical advice.

Can I Take Fat Burners While Pregnant?

No. It is not advisable to take diet pills, fat burners or other supplements while pregnant, unless you are advised to do so by your doctor. If you were using a fat burner before falling pregnant, talk to a medical professional about whether it’s safe to continue using the product.

What Is The Difference Between Prescription and Over-the-counter Fat Burners?

Prescription fat burners are typically more potent than over the counter products, but they can only be supplied by a medical professional. As prescription products are regulated and tested before being introduced, they have known benefits and scientific backing.

However, doctors will only usually prescribe fat burners if there is an urgent need for weight loss due to health reasons or if an underlying condition affects your weight or impedes your ability to lose weight. As a result, not everyone is able to obtain prescription fat burners.

It’s worth noting that prescription fat burners typically contain high doses of active ingredients, which means they may cause side effects. When taking prescription fat burners, you will need to be assessed on a regular basis so that your doctor can monitor you. Side effects of prescription-strength fat burners include:

  • Gastrointestinal distress
  • Temporary incontinence
  • Oily stools
  • Diarrhea

Which Fat Burner Should You Go For?

This guide has given you an in-depth look at some of the best and most effective fat burners for women in 2021. Now you know what the benefits are of the particular products as well as how fat burners work and what specific ingredients do. This should give you an insight into whether a fat burner is the best for you and, if so, which types of products are most suited to your needs.

That being said, for us PhenQ is the big winner today. It is an excellent product backed by science and research that can help you burn stubborn fat, decrease your appetite levels, control cravings, give you energy and even improve your mood. The positive reviews confirm their claims and we can safely recommend if as an effective alternative to help you achieve your body and fitness goals.


Best Fat Burner For Women

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About the Author

Steven has been into health, nutrition, and fitness for over 10 years, and has a degree in Physical Education and Coaching. He is an expert in supplements and is devoted to helping his clients achieve their fitness goals and live their best lives.

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