Read our in-depth and extensive guide to the Best Fat Burners available for both men and women. If you’re looking for fat burners for women specifically, we have a complete guide for that too.
Trying to get into shape and lose some of the more stubborn areas of fat requires a lot of hard work, patience and more importantly dedication. The best place to start to reach your goals is a good diet and taking regular exercise, way before thinking about reaching for a fat burner.
There are two basic type of so-called fat burners, one that helps you to feel less hungry and therefore eat less, making your body burn fat and not store it. The other basically makes you go to the toilet more and gives you not just runny, but greasy waste products.
Best Fat Burners to buy in the UK – At a glance
Don’t be fooled by some claims that fat burners are somehow magic solutions to burn away the fat without having to work for it, they just don’t exist. There really is no shortcut to weight or fat loss success, you need to work at it and keep going, especially when that going gets really, really tough.
To help you reach your fat burning goals, the following list of the best fat burners may help.
1. Instant Knockout CUT – The Ultimate Fat Burner
Includes Glucomannan, Green Tea Extract, 90-day Guarantee, Testimonials
UPDATED MARCH 2021: Instant Knockout rebranded to Instant Knockout CUT and continues to dominate the world of premium fat burners and it’s not just for men. It’s equally suitable for women too.
- Ingredients removed: Zinc, Chromium, Green Coffee Bean
- Ingredients Added: L-Theanine, Vitamin D
- To ensure that the product is still vegan friendly, vegan Vitamin D3 is used
- Ships worldwide
How Do Fat Burners Work?
A Fat Burner supplement works by increasing the bodies natural ability to utilise fat as an energy source, they either do this through raising your metabolism or through creating an “uncoupling” process inside your fat cells which causes fat to be burnt. So while no supplement will work as a magic fix for your comfort eating or lack of a good diet and exercising routine, you can get some help. Hunter Burn doesn’t replace the natural fat burning that happens through exercise or just general day to day living but gives it a big extra boost. Let’s be honest, who doesn’t need some extra help?
So which to take, well I know which ones I prefer and they are all listed on this page. They have the ingredients that will help to feel full and naturally help your body to burn fat. These products are the best around because they all contain glucomannan, which is one of the only ingredients that is approved by the FDA and FSA for it’s fat burning properties.
However, it is important to realise that although they contain ingredients that can help, most of the supplements that call themselves fat burners, including all of the ones that I have reviewed on this page, do not come with any proof that they can or will help with fat loss and fat burning. They are all supplements that have been formulated and designed to support your fat loss goals and they usually contain a number of natural ingredients including plant extracts along with vitamins and minerals, most of which can be bought separately in a chemist or supermarket.
The difference with these supplements is the stacks have been formulated to work together in the right proportions, so you don’t need to worry whether the ingredients you are taking together are safe. One note of caution, make sure the supplement you are taking has the ingredients clearly stated, some proprietary blends won’t have the full ingredients so you won’t know what you are taking.
No matter which fat burner you choose, make sure it has glucomannan and in a decent quantity. There is evidence  to suggest that a dose of around 2-4g per day will aid weight loss. Therefore, you want to look for a supplement that gives you at least this amount per serving. On this basis Hunter Burn has the most glucomannan, which although is a great sign, isn’t the whole picture.
Also worth looking out for is the amount of caffeine in the product, which can lead to unwanted side effects and not a lot else. With most of the supplements here there is an amount of natural tea extract, be that Matcha or just green tea, both of which already have caffeine, so you want to watch which products also have an extra kick just to make it feel stronger.
Set your fat burning goals
Your main goal should be to eat less calories then you burn, not by starving yourself (although there are proven benefits to intermittent fasting over short periods where you eat up to 600 calories per day). The best way to achieve this is to eat less and more healthy food and take regular exercise.
Natural Fat Burners
There are any number of ingredients that lay claim to help to burn fat, manufacturers of fat burners will tell us that we should take some of these ingredients together to get the most out of them, as some ingredients are in a stack to get other ingredients to work better or be absorbed more easily by the body.
One of the most common ingredients in fat burners is caffeine, which is known to increase the hormone epinephrine , which can help to breakdown fatty acids in the blood when exercising .
Caffeine can also increase your heart rate and metabolism helping to burn more fat as fuel, but there are side effects of too much caffeine including anxiety, insomnia, rapid heart rate and fatigue. Not great if you are trying to work out.
This ingredient is also used as an appetite suppressant so good news for those who can’t summon up the energy for a vigorous workout although if you have too much you may need a workout to calm yourself down.
Most fat burners include caffeine so that you get all of the benefits above, coupled with other ingredients it can really give a jolt to your fat burning routine, but there is a note of caution. You can have too much of a good thing and yes you can get similar results from a couple of strong coffees in the morning, but the body can get used to caffeine, so you end up having to drink more and more coffee to have the same effect (sounds familiar).
Taken in a stack with other ingredients can help to nullify the effect of the body getting used to it by combining its power with the other ingredients to get the best out of them, not just using the caffeine by itself – hence why you want to take a fat burning stack not just drink coffee all day.
Another staple of many fat burners and fat burning supplement stacks is green tea, which can help to boost your metabolism and therefore help to lose fat and weight. So you can just drink a few cups of green tea, look in the mirror and you are 10 lbs lighter, not really no if only it was that easy.
The green tea used in most fat burners is usually an extract which is stronger and more effective than guessing how much you are getting in a cup. There are also studies that suggest a combination of green tea and caffeine together can have a greater effect on fat loss than caffeine alone. 
The study also suggests that green tea has thermogenic properties that can promote fat oxidation, more that just the amount explained by the caffeine in the tea (caffeine also has thermogenic properties).
That isn’t to say that you need caffeine and green tea, you could have green tea on it’s own and still have the effects of the fat burning thermogenesis, and caffeine alone won’t give the same effect as both together. From this we can conclude that green tea extract is a powerful thermogenic that will help to burn fat as part of a fat burning supplement, often coupled with additional caffeine.
Green tea also contains Epigallocatechin Gallate (EGCG) which is a catechin, a natural antioxidant that helps to prevent cell damage and has been shown to promote weight loss in some studies. 
We all know that you need fiber in our diets to keep you regular, but it is also essential to keep your body working as it should. Fiber can help with weight loss because it can’t be easily broken down in the body or absorbed into your system, so you feel fuller for longer as your body thinks there is still fuel in it, even though the body can’t digest it.
Your body will also take longer to digest other nutrients that you have eaten, also making you feel full. Your body will also absorb less fat and take on board fewer calories with increased intake of fiber  so it is no wonder this is one of the mainstays of fat burning supplements.
There are two types of Fiber, soluble and insoluble. The soluble fiber takes on water in your stomach to for a gel-like substance that will make you feel full and possibly a bit bloated, not really in the right mood to eat!
The most common Fiber used in fat burners is soluble glucomannan, which is the only fat burning ingredient endorsed by the FDA and the FSA. Other natural sources of soluble fiber are oatmeal, nuts, beans, apples, and blueberries although it is difficult to tell how many apples you would need to eat to have the same effect as glucomannan, plus think of the sugar however natural it might be.
Frequently Asked Questions About Fat Burners
What is a fat burner?
A fat burner supplement can help you speed up your goals for losing fat. Fat Burners typically including ingredients like caffeine and pepper extracts. Together with a balanced diet and exercise plan you can add a fat burner supplement to reach your goals.
Do fat burners work?
It usually depends on which fat burner supplement you buy. Some fat burner products might contain ingredients that really don’t work, but still claim that they do. We only recommend products that contains ingredients that are proven to help you lose fat.
How do fat burners work?
The affective ingredients in fat burners help to increase your Total Daily Energy Expenditure (TDEE) which is how many calories you burn in a day.
How long does it take for fat burners to work?
The honest answer is it depends. It depends on what your diet and exercise regime looks like and what your fat burning goals are. Not everyone responds to fat burners that contain stimulants, which can give you faster results. Fat burners that don’t contain stimulants such as caffeine can still give you results but but as quick as those that do. It all depends!