The most popular type of diet pills on the market are fat burners. They work by increasing the speed of the metabolism, boosting your energy levels, and by raising body heat in an effect called thermogenesis. For many customers a good quality fat burner offers great assistance to any weight loss plan.
Fat burners are not all the same though. You can find fat burners that work, those that are ineffective, and others that are downright dangerous.
If you are struggling to decide whether to take a fat burner, and if so, which one, you can find out everything you need to know in our handy guide.
A fat burner is a diet pill that helps you burn fat by increasing your metabolism and generally reducing the amount of fat your body absorbs.
They work by stimulating hormonal reactions in the body so that you can break down fatty adipose tissue to use as a source of energy. This is a natural process of weight loss that you would experience from going on a diet or starting an exercise program, but taking a fat burner helps you get there faster.
Most fat burners contain caffeine as a key ingredient. Caffeine increases the speed of the metabolism, so it can help the body use up calories faster than would otherwise be possible. Caffeine also enhances energy and helps breakdown fatty acids in belly fat (adipose tissue).
Green tea extract is also effective. This is high in antioxidants and, according to research, a powerful serving of green tea combined with caffeine increases fat oxidation far more than either ingredient used alone. Green tea contains antioxidants called ECGC (epigallocatechin-3-gallate) and polyphenols which can provide significant effects upon the metabolism.
Some fat burner diet pills are high in stimulant ingredients. Stimulants that increase adrenaline can help fat burning by mimicking the body’s reaction to stress. Putting your body into the flight or fight response decreases appetite and increases heart rate, blood pressure, and sweating. This can boost weight loss, but it does create some health concerns.
Not all fat burners contain stimulants though. Many people believe in the powers of conjugated linoleic acid (CLA), a substance present in animal products. Natural substances that increase body heat, such as cayenne pepper and green coffee bean extract, can also help the body burn calories without stimulant-related side effects.
Fat burners can certainly work for weight loss, but they won’t work alone. You need to combine any supplement with lifestyle changes such as exercise and diet, but a fat burner will improve weight loss results, as well as make your plans much easier to stick to.
Many people enjoy the energy boost of a fat burner. Although in most cases this is provided by caffeine, fat burners often contain additional ingredients that can improve feelings of wellbeing. Panax ginseng is sometimes used in fat burners, and amino acids such as L Theanine too, which can improve mood and feelings of calm.
Green tea is proven to increase weight loss through fat burning. It is high in antioxidants, which are not only good for general health but can also increase the speed of the metabolism, helping you lose weight faster.
Although stimulants can increase fat burning, taking ultra-strong stimulants can be dangerous for your health. Some fat burners contain chemicals or natural substances that increase hormones, such as adrenaline or norepinephrine, putting the body into stress mode so that appetite is decreased and heart rate and blood pressure is raised. This can work, but this type of fat burner is not suitable for everyone and side effects are a common issue.
Fat burners will vary according to the product; always check through the ingredients list so you know that the diet pill you choose is the best one for you.
Keep an eye on our website too; that way you can be sure that your fat burner works and will not cause unforeseen side effects.
A good fat burner can help you lose weight (note the key word: good). Taking a supplement in order to increase the speed of the metabolism will help you burn off calories faster and improve your health, but it will not work alone. You need to put some effort in for best results; a lot of this is to do with the metabolism.
Your metabolism is the chemical process that keeps your body functioning in normal ways, such as breathing, sleeping, eating, and digesting food. All of these ordinary processes require energy, and the minimum amount of energy you need is called your basal metabolic rate or BMR. This varies according to your age, weight, and fitness levels, but it can be changed.
If you are active and fit, your metabolism will be faster than the metabolic rate of someone who is overweight and inactive. Someone with a faster metabolism will generally be fitter and less prone to weight gain than someone with a low BMR.
Taking a fat burner will help increase the speed of the metabolism, but it does not repair an unhealthy diet or improve fitness. For that you need to increase your activity levels and reduce your calorie intake.
If you are overweight and don’t change your diet, a diet pill will not make much difference. But if you use a fat burner as an aid to improving health and fitness, it will certainly help.
The added energy of caffeine, combined with other metabolism boosting ingredients like green tea or green coffee, will get you moving.
There is clinical evidence that capsaicin, a compound found in peppers and often included in fat burners, can cause additional calorie burn. Many fat burners contain additional components like this to make weight loss easier.
There are many benefits to taking fat burners. For one thing, a good quality fat burner increases energy levels, which can motivate you to get up off the sofa and do something active. According to health authorities like the NHS, a sedentary lifestyle is dangerous for health and is a major contributory factor to obesity, diabetes, and heart disease. Increasing your activity levels also increases your metabolism and boosts weight loss further.
When it comes to exercise, taking a green tea and caffeine supplement causes a decrease in body fat, especially when combined with resistance training.
Some fat burners contain ingredients that can improve mood. Extracts such as Panax ginseng are classified as adaptogens, meaning they help the body deal with stress and cause general feelings of wellbeing. There is a link between low mood and comfort eating, so if you can feel better you are less likely to snack.
A fat burner will also speed up weight loss. It can be hard going when you start trying to lose weight, particularly if you have a long way to go. A quality fat burner should help you see results much faster than trying to lose weight by diet alone.
Some fat burners help reduce appetite and hunger pangs too. We have seen fat burners that contain glucomannan – a fibre that causes feelings of fullness. Stimulants can also reduce hunger pangs, although they are not suitable for everyone.
Finally, taking a fat burner will help keep you focused. If you actually stick to a plan you will lose weight, and the added support of a fat burner will help with this.
Diet pills are unregulated and there are thousands of fat burners on the market. Some are safe for most people, some are not. Finding out which is which can be extremely difficult, but we are here to help. At Watchdog we only ever recommend supplements that are safe and effective.
Many fat burners contain caffeine, and although this everyday stimulant is safe and well-tolerated, it is not suitable for everyone. In addition, some fat burners can contain extremely high or unknown levels of caffeine, which could cause a reaction in some users.
Other stimulants can be an issue. Ingredients like yohimbine, synephrine, citrus aurentium, and caffeine anhydrous can all increase heart rate and blood pressure, leading to an increased risk of stroke or heart attack.
Allergies can be problematic too. If you suffer from food allergies, to certain plants or shellfish, for example, you should check through the ingredients list carefully before you buy.
An important thing to consider when buying OTC diet pills is whether or not you are taking prescription medication. Some natural substances are completely harmless but can interact with medication. Grapefruit extract, for example, often shows up in diet pills but interacts with most prescriptions.
If you are going to take a fat burner that contains high levels of caffeine or other stimulants, the best way to stay safe is to use with caution. Start off with a low serving size, that way if you do experience side effects they will not be as extreme as taking the full serving would be.
There are some very good fat burners out there but you really need to do your homework before you buy. Diet Pills Watchdog makes this easy by doing the research for you. We only ever recommend good quality supplements that contain effective ingredients and are backed with clinical evidence. Even better, we tell you if a diet pill comes with a money-back guarantee, so even if it doesn’t work for you, you can still get your money back.
Buying a fat burner (or any product) should be risk free. But sadly, there are scammers out there who just want to rip you off with free trial scams and dodgy looking auto-billing agreements. So check with our site before you buy a supplement. That way you will not fall prey to fraudulent operators that could cost you hundreds of dollars or pounds.
A good quality fat burner will help make your weight loss journey easier but, for it to work properly, you do need to put some effort into weight loss and give it time to work. Even a product with effective ingredients in the optimum servings will not work overnight.
Making changes to your lifestyle with a weight loss diet and increasing your exercise levels is a gradual process that will help you lose weight, and support from a fat burner can improve your results and make the process easier.
Unfortunately though, some fat burners can be a waste of money. They can be crammed with inferior or inadequate substances that are not proven to work however you decide to take them. The good news is that there are some great fat burner diet pills on the market that provide vital support to your weight loss plans. And we’ll help you find them.
The major weight loss issue for most people is belly fat. Men and women, young or old – belly fat is THE problem area.
Sadly, you can’t spot reduce problem fatty areas by rubbing on special creams or doing certain exercises. The only way to lose belly fat is to lose weight. There are no other quick fix solutions, unless you turn to surgery, and that is too extreme for most people.
The good news is that because this is often the most noticeable fatty area, it is usually the first to go. A fat burner does not directly target this area, but a good quality supplement with optimum ingredients will have an effect on stomach fat. For example, tests suggest that green tea catechin consumption enhances exercise-induced changes in abdominal fat. Chlorogenic acid, a substance present in Garcinia cambogia, has a similar effect, as does caffeine.
The truth is that belly fat is a convenient marker for obesity and, as it is the area where we tend to carry the most weight, once you start losing weight, your belly will be the first area to reduce.
While you can’t lose belly fat by doing exercises on your stomach, strengthening your abdominal muscles will help improve the appearance. If achieving a six pack is your aim, the only way to do it is through exercise – but it will all be in vain if you don’t lose any excess fat first.
No, fat burners do not burn muscle. A fat burner only burns off fat and water.
Most fat burning supplements contain stimulants that increase the speed of the metabolism. These can boost your energy levels, curb your appetite, and even raise your core temperature so you can burn off calories throughout the day.
So whilst a fat burner will not burn muscle, if you try to crash diet in order to lose weight fast, you may lose muscle mass as well as fat.
The best way to lose weight is slowly. According to the NHS, 2lbs a week is a safe amount for healthy individuals. Doing this is achievable and will not have any negative impacts on health, whereas extremely rapid weight loss can lead to muscle loss.
One study looked at 25 participants following a very low calorie diet of 500 calories a day over five weeks and found that volunteers lost on average 19lbs – but 3.5lbs of this was muscle mass. The same study also looked at participants following a 12-week diet, ingesting 1250 calories a day. This group lost just less than 19lbs on average, but only 1.3 lbs of this was muscle mass.
Ensuring that you consume plenty of protein, fresh produce, such as fruit and vegetables, and some healthy fats will help sustain your health and your weight loss without any loss to muscle.
The answer for most people is yes, because fat burners can be very effective for weight loss. They provide an easy way of supporting the metabolism and increasing energy levels, and can make you feel generally better as you lose weight.
Although not all fat burners are the same, a diet pill that contains effective servings of green tea, caffeine, and natural thermogenics like capsaicin, plus vitamins and amino acids, will certainly help weight loss and general health. In addition, many fat burners help reduce your appetite, making you less likely to snack and overeat.
There is no magic solution to losing excess weight though. A fat burner will not cause weight loss if you don’t make some changes to your diet and activity levels yourself.
A fat burner works best in combination with a diet plan and exercise. And a good point is that it will work with whatever plan you choose, whether it is simply cutting out some of your usual food or following a strict regime. You don’t have to make your diet plan extreme to notice benefits.
If you have mobility issues, a fat burner may not be as effective. If this is you, an appetite suppressant based on a fibre like glucomannan may be more suited to your needs.
Most fat burners contain caffeine in some form or another, so if you are sensitive to stimulants, this type of supplement will not suit you either. Always check with your doctor or pharmacist before any taking health supplements if you are taking medication or have an underlying medical condition too.
Fat burners can come in many forms and may contain a wide variety of ingredients, but when it comes to proven clinical evidence and safety, there are only actually a few proven ingredients.
Top of the list is caffeine. Caffeine is a natural fat burner that increases the speed of the metabolism. It is well tolerated by most people and helps boost energy levels.
Green tea is also effective. Green tea is less processed than ordinary black tea, so it contains high levels of antioxidants – specifically catechins (ECGC or epigallocatechin). Evidence shows that catechins directly increase the metabolism and also cause thermogenesis – heating the body to cause additional calorie burn.
When combined, green tea and caffeine are proven to improve weight loss far better than either ingredient used on its own.
Capsicums (peppers) contain a natural chemical called capsaicin, which also has a strong thermogenic effect – causing an increase in body heat that can help the body burn off extra calories.
There is green coffee bean extract, which is made from unroasted coffee beans, making it lower in caffeine than regular coffee. It also contains chlorogenic acid, which helps reduce the absorption of carbohydrates, is high in antioxidants, and contains mild levels of caffeine.
Many fat burners contain black pepper extract. Although this natural phytochemical called bioperine does not cause fat burning as such, it can increase the absorption of the other ingredients, making them feel stronger.
Powerful stimulants can also be effective for fat burning, but as they can come with so many health risks we do not recommend them for everyone.
Now we have looked at some of the facts surrounding fat burners, let’s take a look at some of the most popular products on the market.
Phentaslim is a fat-burning diet pill that boosts the metabolism, decreases body fat, and, according to thousands of customers, works for weight loss. With scientifically proven ingredients and added vitamins, this looks to be one of the best weight loss supplements on the market.
Phentaslim uses a powerful blend of green tea and caffeine, a combination with scientific evidence showing it increases fat burning. Other components include Panax ginseng and the amino acid L theanine for general wellbeing and feelings of calm.
The supplement is manufactured in a GMP certified facility and full ingredients information is provided, so you know exactly what each three capsule serving contains.
The customer reviews and scientific evidence all point to one thing: Phentaslim helps you burn fat. Feedback is overwhelmingly positive, with users reporting impressive weight loss results.
Side effects are unlikely to be an issue, but you must speak to your doctor before use if you are taking prescription medication.
Phentaslim is not expensive either. It is on sale only via the Optimum Nutra website, where it costs £39/45€/$59 for one month’s supply of 90 capsules. You can make savings on larger orders and there is a 60-day money-back guarantee, meaning you can buy in confidence.
To buy Phentalsim: https://www.phentaslim.com/
Or to find out more: https://www.dietpillswatchdog.com/phentaslim/
Unusually for a fat burner, Hourglass Fat Burner combines proven fat burner ingredients with glucomannan, a natural fibre that decreases appetite. This diet pill is aimed at helping women achieve an hourglass figure and, although this may seem like a corny claim, it works.
The fat-burning ingredients include green tea, and guarana, a natural caffeine extract. There is also capsimax, a pepper extract and natural thermogenic, and vitamins and minerals for improving general health.
The only slight downside with Hourglass is that glucomannan is underpowered at 1500mg per serving, so you may have to double up on dose for maximum effect.
Hourglass is on sale solely via the official website and is not expensive at £30 for one month’s supply. This includes free shipping worldwide. You can make savings on larger orders and the money-back guarantee is valid for 90 days.
Or to find out more about Hourglass Fat Burner: https://www.dietpillswatchdog.com/hourglass-fat-burner/
Evolution Slimming Green Coffee is a diet pill that contains unroasted green coffee bean extract as the sole ingredient, which, according to recent research, may rapidly increase weight loss results.
Green coffee was touted as a miracle in a bottle when first on the market. This seems a little over the top, but recent research carried out in France and the USA suggests it does help with weight loss and improves health without any adverse side effects.
One test found it caused 5.7% of initial body weight increase in weight loss. Another clinical test carried out in the USA saw participants lose an average of 17.5lbs in 22 weeks.
Evolution Slimming Green Coffee is powerful. Each capsule contains 200mg of condensed green coffee extract. This is the equivalent of 2000mg, making the three capsule serving 6000mg.
Customer feedback is positive, with many users reporting weight loss, and is very safe. It does contain caffeine though, which may affect users who are caffeine sensitive.
You can buy Evolution Slimming Green Coffee via the official website. One month’s supply (one bottle) costs £19.99 and you can make savings on larger orders. Shipping is worldwide.
Evolution Slimming Green Coffee comes with a 30-day money-back guarantee.
Or to find out more about Evolution Slimming Green Coffee: https://www.dietpillswatchdog.com/evolution-slimming-green-coffee/
Thermaxin is a powerful fat burner that will suit those who work out in the gym or exercise regularly. It contains a blend of green tea and caffeine, plus the natural thermogenic capsicum, and green coffee extract.
The mixture of green tea and caffeine is shown to improve resistance training and fat loss results. Other ingredients may improve blood sugar control and are rich in antioxidants. This supplement looks to increase metabolism and improve energy as well as weight loss, but it will not suit you if you are inactive.
The serving sizes are generous. Thermaxin contains 150mg of caffeine, plus the caffeine that is naturally present in green tea and green coffee bean extract. Because of this high amount of caffeine, side effects may include increased heart rate and blood pressure, headaches, and jitteriness.
Customer feedback is mainly positive, with many gym users mentioning increased sweating and extra energy.
Thermaxin is made by British company Astral Nutrition. It is on sale via the official website where it costs £29.99 for one month’s supply of 60 capsules. Thermaxin also comes with a 30-day money-back guarantee.
Or to find out more about Thermaxin: https://www.dietpillswatchdog.com/thermaxin/
PhenQ is a fat burner diet pill with some unusual components, including a trademarked formula called a-lacys reset that claims to accelerate your metabolism. The formula also contains caffeine and a pepper supplement, Capsiplex, which may help fat burning.
A-lacys reset is PhenQ’s secret ingredient though. We discovered that this is a blend of ALA (alpha lipoic acid) and cysteine – amino acids that may have a metabolic effect.
Ingredient quantities are not provided and PhenQ may cause side effects such as jitteriness, mild digestive complaints, and headaches. However, there is positive customer feedback for the supplement.
One bottle of 60 capsules (30 day’s supply) costs £45.95, but discounts are available on larger orders. Shipping is free worldwide and there is a full 60-day money-back guarantee.
To buy now: https://phenq.uk/
Or to find out more about PhenQ: https://www.dietpillswatchdog.com/phenq/
KOR Fat Burner for Men contains a lot of stimulants, so if you are a man who works out, this diet pill may appeal to you. The claims are that it will increase fat burning by decreasing your appetite and increasing your energy. It is also supposed to boost mood and focus.
The mix of stimulants includes caffeine anhydrous – a powerful form of caffeine, which is strong, at 200mg per serving. There is yohimbine, plus a branded stimulant formula called Advantra Z, which contains synephrine. It also contains vitamins and Garcinia cambogia.
Side effects could be an issue, particularly increased heart rate and blood pressure. Strangely though, customer feedback is mixed, with many people reporting zero effects and zero weight loss. So this diet pill is obviously not as powerful as it claims or as the ingredients list suggests.
You can buy KOR Fat Burner for Men via Amazon or from the official KOR site, where it costs $39.95, plus US shipping for an additional $3.95. You can make savings on larger orders, and there is a 90-day money-back guarantee valid on one opened/used product.
To find out more about KOR Fat Burner for Men: https://www.dietpillswatchdog.com/kor-fat-burner-for-men/
Bioleptin is a scam. This diet pill is sold online via a lengthy video and a one-page sales letter from a company called Puregreens. Although the advertising looks American, the company behind Bioleptin is based in Singapore.
There isn’t much information about the ingredients or the strength of Bioleptin. It appears to only contain African mango seed and a branded chromium supplement, so it may have a slight weight loss effect.
However, it is likely that it also contains undisclosed ingredients, as customers have mentioned side effects, including heart palpitations. So who knows what is actually in this diet pill!
Bioleptin is extremely overpriced at $59.95 for one month’s supply of 60 capsules. You are encouraged to buy a larger order, such as $199.95 for six bottles.
There is an advertised guarantee, but customers who have tried to claim have been unable to find a return address or contact details. As a result, hundreds of angry customers have complained to a company in Colorado also called Puregreens, who actually deal in cannabis cultivation.
If you have bought the overpriced Bioleptin, don’t waste your time trying to get a refund because it will not happen.
To find out more about Bioleptin: https://www.dietpillswatchdog.com/bioleptin/
Aimed at bodybuilders, Phenelean is a fat burner diet pill that claims to work in the same way as the prescription drug Phentermine. It contains some unproven ingredients, as well as a dangerous substance called Amp Citrate.
Phenelean is supposed to increase energy levels and decrease appetite. But the servings of caffeine, cayenne, green tea, and grape seed are low, so it looks ineffective.
More worryingly is the Amp Citrate, a form of DMMA (Dimethoxymethamphetamine) that was banned in 2012 for causing heart attacks. The serving size is low, but concerning nonetheless.
If you take part in competitive sport, Amp Citrate will get you banned for doping. The FDA is likely to ban Amp Citrate in the future.
Side effects may include increased heart rate, palpitations, increased blood pressure, vomiting, nausea, and more. Watchdog readers have mentioned some of these too.
Phenelean is on sale from Pro Muscle, where it costs £25.00 for 60 capsules. It is also available via eBay and other sites. Origins about manufacture are unknown, but it is likely that this diet pill has been imported from Asia. There is no money-back guarantee.
To find out more about Phenelean: https://www.dietpillswatchdog.com/phenelean/
Carbon Fire Onyx claims to boost energy and alertness, as well as fat loss. It contains a proprietary blend called the Neuro Syn Matrix, but individual ingredient quantities are unknown. It does not look effective for weight loss and it seems potentially dangerous.
Along with caffeine there are some unusual stimulants, including Hordenine, which affects the nervous system, and Beta Phenylethlamine – an addictive substance supposed to boost serotonin and dopamine.
Most of the contents are associated with nootropics (brain pills) rather than weight loss, and there is a long list of potential side effects provided in the product information.
Because Carbon Fire Onyx is on sale solely from the official website, there is zero independent customer feedback. One customer wrote to us complaining of side effects though.
Carbon Fire Onyx is expensive – it costs $79.99 for 80 capsules (one month’s supply). You are advised to use in combination with two other supplements in a pack called CF24. This makes it even more expensive and even more dangerous. Carbon Fire Onyx does not come with a money-back guarantee unless you buy CF24. Even then it is unlikely you will obtain a refund.
To find out more about Carbon Fire Onyx: https://www.dietpillswatchdog.com/carbon-fire-onyx/
Thermatrim Plus is advertised as a fat burner that is supposed to boost your metabolism, but there is no evidence that it will work as claimed.
The ingredients profile looks ineffective and the quantities are unknown. It contains a source of caffeine called guarana, plus Garcinia cambogia for blocking carbs. It also contains chitosan – a substance made from shellfish skeletons, which is supposed to block fats.
Although some of these ingredients are touted for weight loss, there is no evidence that Thermatrim Plus will work, and with only 500mg per capsule serving, ingredient quantities are low.
Describing this supplement as a fat burner is misleading; apart from some caffeine, there is nothing in this supplement that works in this way.
You need to avoid Thermatrim Plus if you are allergic to seafood.
Thermatrim Plus is on sale from British company Slimming Solutions. It costs £29.95 for 60 capsules (one month’s supply) and shipping is £2.99. There is no independent customer feedback and no money-back guarantee.
To find out more about Thermatrim Plus: https://www.dietpillswatchdog.com/thermatrim-plus/
Many people are tempted by fat burners. This type of diet pill is the most popular on the market and often promises easy weight loss with very little effort.
The truth is that fat burners can vary a great deal in quality and strength as there is no single formula. We have seen fat burners that contain ultra-strong stimulants with the aim of copying the effects of old style diet pills that contained amphetamines. There are herbal supplements that are supposed to increase the metabolism by the use of antioxidants and vitamins and minerals. And there is everything in between. Clearly, it can be a minefield for the customer who just wants something to work.
There are some simple rules to keep you safe and prevent you from wasting your money though. For example, choose a fat burner that contains caffeine and green tea, as this combination has clinical support showing that it works. Green coffee bean extract has a milder effect but there is strong evidence for this too. Cayenne pepper may have a mild thermogenic effect, so it can be an additional component to a fat burner.
For best effects you should always combine a fat burner diet pill with some dietary changes and exercise. Sadly, there is no magic product that will do it all for you, but armed with a plan and a good quality fat burner, you can reach weight loss success.
Check out our approved list of fat burners so that you can find the supplement that works best for you.