Best fat burners 2018 – Your ultimate guide to shredding fat

The definitive guide to the top five most effective fat burner supplements available to you right now

Best Fat Burner supplements
Instant Knockout and Leanbean are the top rated fat burners on the market Photo: The Sport Review

Are you looking to get ripped and lose those stubborn areas of fat? It could be time to try a quality fat burner supplement.

UPDATE: We’ve updated this guide with the latest information and supplements for 2018. We currently rate Instant Knockout (for men) and Leanbean (for women) as the best fat burners on the market right now. We’ll be reviewing and updating this article with the very latest information throughout 2018.

Cut fat quicker, get more results from your training and dieting, boost your confidence and reveal that sexy six-pack with our ultimate fat burner guide.

You don’t need to spend hours and hours researching, because we’ve done all the hard work for you.

Our team of experienced researchers have gone through endless ingredient studies, looked at real customer reviews and testimonials and tried out countless fat burning supplements to find out which really work and which are a waste of money.

This is your ultimate guide to the best fat burner supplements in the UK, USA and the rest of the world on sale right now.

Current Top Rated Fat Burner Supplements

Rating Summary Website
Instant Knockout Instant Knockout ★★★★★ • Quality Formula • Safe and Natural • Great Reviews • 90-day Guarantee Buy Now
Leanbean Leanbean ★★★★★ • Made For Women • Quality Formula • Veggie Capsules • 90-day Guarantee Buy Now
PhysiqueSeries PhysiqueSeries Fat Burner ★★★☆☆ • Solid Formula • Veggie Capsules • Decent Reviews Buy Now
Cutting Edge Cutting Edge ★★★☆☆ • Decent Formula • Cheaper Product • UK/Europe Only Buy Now
Thermopro Thermopro ★★★☆☆ • Lots of Ingredients • High Stimulant • UK/Europe Only Buy Now

Here’s what we looked for:


Does the product actually do what it says? We avoided the marketing hype and dug deep to look for customer reviews on social media, forums, YouTube, blog posts and the testimonials on the company’s websites.


Does the product contain any harmful or risky ingredients? Fat burners have a bit of a bad reputation – some companies overload the product with stimulants or use risky ingredients.

We studied the potential harmful ingredients and didn’t include any products on our top 5 list that contained anything risky or had high doses of caffeine. All the products listed below shouldn’t cause any unwanted side-effects like jitters or heart palpitations.

Fat burner man and women

Achieve your lean dream with a quality fat burner supplement Photo: Adobe Stock

Company reputation

We look at the reputation of all the company’s behind the products below. The other products in their line, how effective they are, if they treat customers fairly or not. If they use high quality ingredients and full doses or if they cut corners to save money.

Multi-action fat attack

The best fat burners on the market fight fat in more than just one way, they:

• Boost metabolism – helping you to burn more calories throughout the day.

Suppress appetite – helping you to reduce snacking and sweet foods

• Provide you with energy – to keep you motivated, on track and in the gym.

Single action products are generally not as effective. To shred fat fast you need a product that can do all three of the above by delivering the right ingredients in the right amounts. Three to four capsules per day is what it takes, one or two capsules-a-day products do not have much effect.

Best fat burners

If you’re looking for the best fat burner for women on sale right now, be sure to check out our separate guide.

So with all of that out of the way, here is our ultimate pick of the best fat burners on sale right now:

1) Instant Knockout

Product website:

instant knockout

The secret formula that pro MMA fighters use to get shredded and make their weight class in time for a fight. It’s the fat burner to use when cutting fat in time is mission critical.

Instant Knockout from specialist supplements company Roar Ambition is the heavyweight champion in the fat burning world.

When researching this product came up listed as number one on endless review websites. As we did our own research it quickly became apparent why it is the best fat burner available.

The main points

• Lose fat all over your body, get a visible six-pack – Just like a pro fighter does

• Boost your confidence and self-esteem – Look and feel good with your shirt off

• Raise your energy levels, safely – Feel motivated to go to never miss a gym session

• Fully dosed serving – 4 easy to take capsules through-out the day means you’re always shredding fat

• Safe, effective, legal – Doesn’t contain any risky or banned ingredients, it’s a 100% natural formula and completely safe

The ingredients

We found that Instant Knockout contains the best and most researched natural fat burning ingredients available. The top ones are:

• Green Tea – Not just a common drink, Green Tea is a powerful natural fat burner when taken in the right amounts. It boosts metabolism and increases energy levels. A number of studies over the years have proved this time and time again.

• Cayenne Pepper – Capsicum, extracted from the chilli pepper, raises your body temperature and can help to reduce the amount of fat that your body stores. People who regular eat chilli peppers gain less fat.

Don’t worry if you don’t like spicy food. The extract isn’t spicy, it goes straight into your stomach.

• Glucomannan – Say goodbye to nagging food cravings. This is a dietary fiber extracted from the root of the konjac plant. It swells up in your stomach making you feel full for longer. There’s a ton of research to show how effective Glucomannan is.

Here’s the full list of ingredients and the exact amounts:

Instant Knockout fat burner ingredients

Unlike many other supplements, the exact doses of each ingredient are clearly listed

It also contains low dose of caffeine that works well with Green Tea and Cayenne Pepper, three natural stimulants to seriously attack the fat.

The other ingredients all have credible studies to show how effective they are at burning fat.

How to take it

Each bottle is a month’s supply, it contains 120 capsules.

You take one capsule, four times per day in between meals. Because of the Green Tea and Caffeine, it’s recommended that you don’t take it close to bedtime.

What are people saying about it?

We found a huge amount of positive customer reviews on social media and YouTube talking about how Instant Knockout has helped them to lose fat without the side-effects.

It’s used by some of the top UFC fighters in the world at Greg Jackson’s gym. Greg has trained some of the biggest names in the sport: Jon Jones, Diego Sanchez, John Dodson, George St-Pierre, Holly Holm and many more.

Checkout which pro fighters use it on their pro athletes page.

We did find a few people say that the product didn’t work for them. Every product that we researched had at least some unhappy customers.
It’s difficult to know if those customers have been following a diet and working out. You can’t just take a fat burner while continuing to live and unhealthy lifestyle and expect to lose fat.

You can see all the customer testimonials with before and after pictures here.

Price, shipping and where to buy

The price for one bottle is: $59 / £35 / €45. They have a deal on where you buy 3 and get 1 free, it also includes free shipping, this works out to be about $46 / £27 / €35 per bottle.

You can’t buy this product in the shops. It’s only available to buy directly from their website.

They only manufacturer in the USA and UK in cGMP and FDA approved facilities. One of the reasons why they only sell direct is so they can offer a 90-day money back guarantee.

When you buy the 3 box deal, you are fully covered by their results guarantee promise.

They have 2 shipping depots, from the USA and the UK, they ship worldwide and have fast and tracked shipping options from both countries. 
If you’re in the USA or UK you can expect to get it in 1 – 4 days. Even if you’re in Australia you can get it as quickly as 4 – 5 days.

Any negatives?

• You can only buy it from their website – This is how they can offer you the guarantee and expert customer support.

• Premium price – The large dose of premium ingredients comes at a higher cost.

• You must remember to take four capsules per day. This may be difficult for people with busy lives.

During our research we didn’t find anything alarming about Instant Knockout. A few customers complained about problems with delayed shipping from USPS and Royal Mail. They offer courier services if you’re willing to pay more.

instant knockout

We recommend Instant Knockout as the best fat burner on the market right now

The bottom line

If you’re serious about cutting fat and want the absolute best product on the market (and you’re willing to pay extra for it) then Instant Knockout is the fat burner for you.

There’s a huge amount of research behind the ingredients. They’re safe, effective and legal. You don’t need to worry about unwanted side-effects.

The fact that top UFC coaches and fighters have put their name to it and use it for their weight cuts is reassuring to see.

The only negative things we could find was the premium price and having to order direct from the company. It looks like the company do a lot to keep customers happy and help them with their fat loss journey.

We recommend it as the best fat burner on the market right now. For noticeable results you need to commit to at least 2 – 3 months of using it. In the same way that a fighter would take 2 – 3 months to cut fat for a fight.

2) Leanbean (Best Pick for Women)

Product website:

Leanbean bottle

When doing our research into the best fat burner supplements, we found that most of the products were aimed towards men.

Leanbean stood out from the crowd because it was designed from the ground up to be specifically tailored for women.

It was originally created for female fitness models looking for a safe way to boost their performance without getting bulky.

Whilst there are a few other female-targeted products out there at the moment, none of them came close to matching Leanbean’s ingredients profile.

As you’d expect, the all-natural formula is manufactured in FDA approved facilities and to GMP standards. Leanbean also offers express delivery options worldwide, and as with other top products in this category a 90-day money-back promise when you buy their three-month supply.

The main points

• Helps target unsightly fat from problem areas – Including hips, thighs and belly

• Natural formula that raises core temperature – Improved metabolism and energy for better results in the gym

• Improved beach body confidence – No more bikini fear

• Safe ingredients in female appropriate doses – Supports wellness as well as weight-loss

The ingredients

Like Instant Knockout, Leanbean contains some top quality natural ingredients such as Green Tea Extract, Glucomannan and Cayenne Pepper.

What sets Leanbean apart is that it also includes Tumeric, which helps to promote healthy levels of Estrogen in women. That’s great because too much Estrogen can cause fat storage in women.

It also has some of our favorite substances for products in this category, such as Chromium, Green Coffee Extract and Black Pepper Extract.

The other good ingredients in Leanbean include Raspberry Ketones and Garcinia Cambogia. It was great to find a professional product targeted specifically at girls.

You can see the full list of ingredients below:

leanbean ingredients

We’ve picked Leanbean as the best fat burner choice for women

What are people saying about it?

Leanbean is quite a new product but we still found plenty of good reviews.

This product seemed to be particularly popular on social media, with lots of girls posting pictures and positive testimonials on the company’s website and Instagram.

One user said that Leanbean helped her step up her fat loss after her progress had stalled.

Another woman said that Leanbean consistently helped her lose weight and also made it easier to maintain a healty diet.

Leanbean fat burner results

Any negatives?

• You can only buy it from the official website right now.

• Quality ingredients do mean that this is another premium priced option.

The bottom line

Leanbean is a great product and our star pick for a female fat burner.

The formula includes some of the best researched ingredients out there, all of which are used by professional athletes. As a result this does make Leanbean one of our more premium priced options.

Prices start at $59 / £35 for a one month supply (120 capsules). You can also get a free bottle and workout guide when you buy their ‘Bikini Body Bundle’.

You won’t be able to find it cheaper elsewhere as you can only buy it direct from the official website at the moment.

For the most satisfying results, we’d suggest committing to a couple of months course and pairing it with regular training.

3) PhysiqueSeries Fat Burner

Product website:

PhysiqueSeries Fat Burner

PhysiqueSeries is a fat burner supplement made by Transparent Labs.

They are a US-based company who claim to offer full transparency on all of their products so you know exactly what’s in them.

That’s great news, because we always recommend staying clear of products that use proprietary blends. All of the supplements on this list show their full ingredients clearly.

The ingredients

PhysiqueSeries uses some solid ingredients in good doses. That includes 400mg of Green Tea Extract per daily serving.

It also uses 240mg of Caffeine Anhydrous to boost energy levels and 100mg of Cayenne Pepper per day, so it ticks all three boxes when it comes to the top three fat burner supplements.

The slightly disappointing thing is that it doesn’t use a proven appetite suppressant as a standalone ingredient. We would have suggested swapping the 5-HTP it uses for something like Glucomannan – one of the best natural appetite suppressants you’ll find.

Synephrine HCl is also reported to cause problems when it’s combined with stimulants such as Caffeine.

Here is the full ingredients list:

PhysiqueSeries fat burner ingredients

What are people saying about it?

There are a lot of positive reviews of this product on the official website, but we guide that’s no surprise.

One person said they swear by the Transparent Labs brand and that the Fat Burner worked well for them.

There were also some many more positive comments from other reviewsers.

The negative reviews featured reports from people saying the product didn’t work for them, while someone else complained that it gave them migraines.

Any negatives?

• No Glucomannan to suppress appetite.

• 5-HTP not an effective fat burning ingredient.

• Synephrine HCl can cause problems when combined with Caffeine.

The bottom line

This is a decent option and that’s why it’s third on our list. It contains some good ingredients and has some solid reviews, but it’s not the top formula on the market right now.

4) Cutting Edge

Product website:

cutting edge

If you’ve read any of our reviews before, you’ll know that we’re fans of Bulk Powders’ products and we were impressed by their fat burner, smartly called Cutting Edge.

This product is billed as one of the “strongest” fat burners on sale at the moment and we quite like the ingredients list.

It contains some good things and is definitely a good option, even though we feel that the two products above are slightly better in terms of ingredients.

The ingredients

Cutting Edge contains a good blend of some of the top fat burner ingredients that we like to see.

Its main ingredients are Caffeine, Green Coffee Bean Extract, Glucomannan, Chromium and BioPerine (Black Pepper Extract).

We were also pleased to see Cinnamon Extract and Peppermint Leaf Powder included on the label, although we’re not sure about their fat burning properties.

The only main things missing from this product were Cayenne Pepper and Green Tea Extract. That was a shame because we love to see these two ingredients in supplements in this category.

What are people saying about it?

We did some digging around the internet and found that Cutting Edge is pretty well-reviewed.

One user said that they found the product to be an amazing boost and that they felt full of energy while taking it.

Another customer said that it helped to stop them feeling hungry all the time and prevented them from snacking.

Someone else said that Cutting Edge had helped them lose a lot of weight in just four weeks.

Any negatives?

• Doesn’t contain Cayenne Pepper.

• No Green Tea Extract either.

The bottom line

Cutting Edge is a good product and definitely contains some of the best natural fat burner ingredients around at the moment. That being said, it was disappointing not to see any Cayenne Pepper or Green Tea Extract on the label.

5) Thermopro

Product website:


This is the fourth product on our list. Thermopro is made by a company called The Protein Works and has some pretty good ingredients.

The Protein Works are a reputable company and their Thermopro product is designed to boost your metabolism and help speed up the rate at which you burn fat.

The doses of some of the ingredients are not as strong as in other products but the label is still pretty good.

The ingredients

Thermopro has the longest ingredients list of any of the other products on this list, which is both a good and a bad thing.

The good news is that they’ve included lots of top quality ingredients such as Cayenne Pepper Extract, Green Tea Extract, Green Coffee Bean Extract and Caffeine.

Also on the list are things like B Vitamins, Bitter Orange Peel, Black Pepper Extract and Guarana. It was a shame not to see Glucomannan included on the list, though.

The main issue we have when a product has this many ingredients is that it tends to mean that the doses are not as strong as they should be.

What are people saying about it?

This seems to be another well-reviewed product, although many of the testimonials we read seemed to focus on Thermopro’s benefits as an energy-boosting pre workout rather than a fat burner.

One user reported that they felt like it gave them a big energy boost without any crashes or comedowns.

Another customer said that they were taking the product before going to the gym, effectively using it as a pre workout.

However, someone else said that they didn’t notice that they were losing any more weight than usual while on this product.

Any negatives?

• Possibly has too many ingredients.

• No Glucomannan or Zinc.

• High stimulant content.

The bottom line

This is a good product but it seems to work better as a pre workout supplement than an out-and-out fat burner. The ingredients list is a bit too long for our liking and there are a few things missing from it in our opinion, too.

Things to look out for and avoid

If you’ve done any research for yourself about fat burners, you’ll already have come across some dodgy products.

After doing the research, we found that there are few things you should look out for and avoid when picking a fat burner.

• At least four capsules per day for a fully-dosed formula Most products require you take a few capsules each day. But we found that you’ll need to be taking at least four servings per day to get the proper dosages of the ingredients and feel the full effects.

• Stay away from proprietary blends Proprietary blends are when the manufacturer of the supplement hides the individual doses of the ingredients in a general ‘blend’. This is something to avoid because it means you have no idea about how much of each ingredient is in the capsule.

• Check where the products are made You’ll want to make sure that the products come from safe and legal quality sources. You should check to make sure that the manufacturer uses cGMP and FDA approved facilities.

What are the best ingredients and how do they work?

There are lots of good natural ingredients to consider when it comes to the best fat burners, but we’ve picked out four of our favorites below and explained exactly how they work.

• Green Tea Extract This is one of our favorite ingredients at the moment and you’ve probably already come across it before.

Green Tea contains Catechins and ECGG, both of which are believed to increase your resting metabolic rate and therefore cause you to burn more calories.

It also has a host of other health benefits, as well as being packed with antioxidants.

Green Tea Extract

Green Tea Extract has potent thermogenic properties Photo: Adobe Stock

• Cayenne Pepper Another one of our ‘top’ ingredients for supplements in this category.

Cayenne Pepper can help with fat loss in two ways. Firstly, it can boost your metabolism due to its spicy nature.

Secondly, it’s known to act as an appetite suppressant, meaning it could make it easier to stick to your diet and avoid cravings.

• Glucomannan This is another one of the first ingredients we look for on the label of a fat burner supplement.

Glucomannan is a dietary fiber that comes from the root of an elephant Yam plan.

It can work as a powerful appetite suppressant by adding volume to the food that you’re eating, to keep you feeling fuller for longer and reduce the temptation to snack on unhealthy foods.

• Caffeine Anhydrous This ingredient needs no introduction, as it’s being consumed by millions of people worldwide on a daily basis.

It’s of course present in tea and coffee, but what you may not know is that Caffeine can promote fat loss by boosting your metabolic rate.

It can also help keep you feeling energized and focused, which is definitely something you’ll want if you’re going to be hitting the gym and training hard while on your fat-loss journey.

You can find out more about the best fat burner ingredients on our dedicated page.

Anything else to consider?

As we’ve already mentioned above, there are no shortcuts to success when it comes to losing body fat.

You’ll have to make sure that your exercising regularly and eating healthily as your first step and we recommend to get these two things sorted before considering taking a fat burner supplement.

That being said, many people have reported that adding a quality fat burner to their regimen has helped them to take the final step in cutting fat and getting the body they’ve always wanted.

Conclusion – our final thoughts

So there we have it, our pick of the five best fat burners on sale at the moment, both in the USA and worldwide. We definitely think that Instant Knockout and Leanbean stand out as the best products around at the moment, but you’re not going to go too far wrong by selecting one of the supplements on this list.

The Sport Review's product reviews are independent advice you can trust. Sometimes, we earn revenue if you click the links and buy the products, but we don't allow this to bias our coverage. The reviews are produced through a mix of expert opinion and real-world testing.

• Updated on October 10, 2018


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