The Best Fat Burners of 2021 (UK)

We spend months, testing and analyzing the best fat burners in the UK so you don’t have to. After countless hours of reading studies, testimonials and anything else we feel could help you – we finally have our answer.

Below we have made a list of what we believe to be the best for this year. As not everyone is the same, our list includes what works for men, women and for those who are newer to UK fat burners.

Fat burners aren’t for everyone. Before you go any further you need to make sure you are:

• Motivated to burn fat.
• Exercising regularly (or prepared to).
• Have (or starting) a healthy diet.

In this article, we’ll reveal what we believe to be the best fat burners for men and women in the UK, along with what we think is the best value. We’ll give you a brief rundown and if you want to know more, you can click through to our full reviews.

After that, we’ll also discuss how we came to these results and how you can use the same information to find the best fat burner for you from the UK market.

All of the following supplements are made in cGMP and FDA approved facilities and made in either the UK or USA (or both), we wouldn’t recommend any that aren’t.

Best Overall:
Instant Knockout

Price: $59.00 / £35.00 / €45.00	Equal to: $1.96 a day
Our Review	Website

This is the best fat burner in the UK that we’ve come across on the market for men. Although, we do know a few women who take it as well.

Why do we like it? Because everything works:

• Great, Effective Ingredients – Everything is backed by well-documented studies.

• Burns fat, boosts energy and suppresses appetite – Good for burning fat, improving workouts and keeping you on track with your diet.

• Instant Knockout’s servings are generous and often – You take it 4 times a day for constant effects.

• Safe to use – Made in a cGMP and FDA approved facility. We have yet to hear a case of someone reacting badly to Instant Knockout.

• Available Worldwide – They all over the world from both the USA and UK

• 90 Day Money Back Guarantee – For any reason if you’re not seeing results, you can send it back for a full refund.

• Discounts Available on Mutli-Box Orders – Buy more than one and get anything from free shipping to a free box depending on the size of your order.

Instant Knockout is made by UK company Roar Ambition, and it is one of the more hardcore supplements out there. It’s the only supplement on our list that has been endorsed by MMA fighters like UFC legend Diego Sanchez:

It’s an effective supplement for those who are serious about fat loss and are not afraid to put in the work to see results.

Things to consider before purchasing:

• Only available on their website – Instant Knockout is only available on their official website. (InstantKnockout.com) Although AmazonPay, Paypal and cards are all accepted.

• 4 servings a day – You need to be taking this supplement 4 times a day (suggested times 8am, 11am, 2pm, and 5pm).

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Best for Women:
LeanBean

Price: $59.00 / £35.00 / €45.00	Equal to: $1.96 a day
Our Review	Website

We did a lot of research to find the best UK fat burners on the market for women, and there is not better than LeanBean. Made by Ultimate Life, this fat burner is similar to Instant Knockout but more tailored to women.

This is why it’s our #1 for women:

• Safest Option – No side effects reported, all ingredients are completely natural.

• 100% Vegan – The capsules used are vegan, and the supplement is totally safe for vegetarians and vegans.

• A Lot of Great Results – Pages full of positive LeanBean testimonials online.

• Effective Servings – 4 a day for day-long fat loss.

• Promotes Female Health – Supplement designed specifically to benefit women.

• Discounts on Multi-Box Purchases – Buy more than one order and get more for your money (free shipping / free month’s supply depending on order size).

Again, this is another UK company, but they ship worldwide. LeanBean is already getting some great feedback online. Here’s one of the better video reviews out there:

For those of you that don’t speak British, a stone is the equivalent of 14 lbs.

There’s a ton of these online, and the best ones have been submitted to their website. (LeanBeanOfficial.com)

Things to consider before purchasing:

• Again, like Instant Knockout, you can only order it from their website – but again, they do accept Paypal, AmazonPay and major cards.

• 4 servings a day – You need to be taking this supplement 4 times throughout the day.

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Best Overall:
Burn Lab Pro

Price: $59.00 / £39.00 / €49.00	Equal to: £1.30 a day
Our Review	Website

This is the best fat burner overall: Burn Lab Pro. Caffeine-free, vegan friendly, and absolute stormer of a fat burner.

At £39.00 a box, the Burn Lab Fat Burner really impressed us.

It is the only premium UK fat burner on the market designed for fasted workouts, and the quality of the ingredients is not to be ignored.

Unlike the other two ingredients in this supplement, it is tailored to help those who train fasted.

Here’s what we like the most about the Burn Lab Pro fat burner:

• Stimulant Free – Zero caffeine in this supplement, there are no chance of jitters or side effects.

• Boost Muscle Mass – Coleus Forskohlii & HMB help maintain and promote muscle mass while fasted.

• 100% Vegan – Capsules and ingredients are all safe for vegetarians and vegans.

• Money Back Guarantee – Result in 30 days or your money back.

• Discounts on Multi-Box orders – Free shipping and money off with bigger orders.

• Highest Quality Ingredients – All study-backed and made to the highest possible standard.

It’s easily the cleanest supplement in this list. Burn Lab Pro is vegan, soy-free, caffeine-free, non-gmo, gluten-free and allergen free. They’re also certified halal and kosher friendly.

Things to consider before purchasing:

• You should be following intermittent fasting – This supplement works best when taken before a fasted workout.
• Can only be bought off Performance Lab site – You can only get this supplement from the official site.

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Summary:
We Recommend

Instant Knockout
– Our Score: 9.7/10 –

Best for…	Price	Ingredients	Dose	Proprietary Blends?	Safety	Guarantee
Overall	£35.00	9.7/10	9.7/10	No	9.7/10	90 Days

Want to learn more about Instant Knockout?
Read Our Review
or
– Visit Their Website –

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LeanBean
– Our Score: 9.5/10 –

Best for…	Price	Ingredients	Dose	Proprietary Blends?	Safety	Guarantee
Women	£35.00	9.3/10	9.5/10	No	9.5/10	90 Days

Want to learn more about LeanBean?
Read Our Review
or
– Visit Their Website –

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Burn Lab Pro
– Our Score: 9.7/10 –

Best for…	Price	Ingredients	Dose	Proprietary Blends?	Safety	Guarantee
Alternative	£39.00	9.7/10	9.5/10	No	10/10	30 Days

Want to learn more about Fat Burner?
Read Our Review
or
– Visit Their Website –

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How did we decide these fat burners?

There was a lot research that was performed when it came to deciding these fat burners. A lot of it was consulting studies, however, there’s much more to it than that.

Generally, you want to be considering three main areas when it comes to a supplement:

1. The Ingredients – and if they work.
2. The Servings – if there’s enough a day.
3. The Manufacturer – and if they care about the customer.

For the rest of this guide, we’re going to focus on these areas and what you should look for in them to get to know if a supplement is right for you.

The Ingredients: What we look for

In our opinion, the ingredients are the most important part of a fat burner. It is the thing that matters most in any supplement like this.

When looking at a fat burner’s ingredients they should always be:

• Open about their dosage
• Backed by studies
• Not linked to side effects

Here’s a little more about what we mean…

Open about their dosages / No Proprietary Blends

One of the biggest problems in the supplements industry at the moment are proprietary blends. This is when a supplement manufacturer chooses to hide the individual dosages of the ingredients used in their product.

Instead, all the ingredients are displayed under one, or several larger dosages.

Take a look at this example:

See in the pink box? None of the dosages here are revealed. This means you don’t know what it is that you’re actually taking.

This could mean several things:

1. It’s under-dosed where it counts – The manufacturer doesn’t want you to know they cheaped out on the more expensive ingredients.
2. It’s over-dosed in dangerous areas – The ingredients may be balanced in a way that may cause side effects, but the manufacturer doesn’t want that to put you off buying.
3. It changes constantly – The manufacturer may keep changing dosages depending on what they can get cheapest at the time of manufacturing.

The bottom line is that this lack of transparency is unacceptable. Without knowing the dosages, you don’t know what you’re getting and this could cause you problems if you’re not careful

Instant Knockout, LeanBean and Performance Lab SPORT Fat Burner all have 100% transparent ingredient labels. You know exactly what you’re getting with each one, and how much.

Backed By Studies

This is another thing that we look for analyzing supplement ingredients – although it should be the most obvious one.

Whenever you come across ingredients in a fat burner, or any supplement, you should research the ingredients to make sure that they have the studies to support the claims.

There are plenty of resources out there that compile studies on natural nutrients and their effect on your health.

Some of our favorites that we tend to look out for include:

• Green Tea – Thermogenic fat burner that also boosts focus. (Found in both Instant Knockout and LeanBean)

• Glucomannan – Fibrous complex that suppresses appetite and regulates cholesterol. (Also found in Instant Knockout and LeanBean)

• Cayenne Pepper – Thermogenic fat burner that also has merit as an appetite suppressant. (Found in Instant Knockout, LeanBean and Performance Lab SPORT Fat Burner)

These are just some of the ingredients to look for to give you an idea of what we look out for.

No Side Effects

Another factor that you want to ensure is that the ingredients that you’re looking at do not have links to any side effects.

To find this out you can look to personal reports of people who have had bad experiences with the nutrient online, or studies where the participants have reported some kind of discomfort from supplementing these nutrients.

Some of the more potent ingredients to look out for include:

• Synephrine (aka Bitter Orange Extract)
• Yohimbe
• Too Much Caffeine (400mg or higher)
• DMAA
• Ephedrine

There are more out there, always do your research first. It also helps if the supplement is manufactured in a safe environment. It’s a very good sign if they’re manufactured in somewhere like the USA or UK in a cGMP (Current Goods Manufacturing Process) and FDA approved facility.

The Servings: What works best?

Although ingredients are important, the servings also matter too. How often you take a fat burner throughout the can determine how effective it is.

A good example of this would both be Instant Knockout and LeanBean. Each of these supplements offer 4 servings a day. This is good for fat loss as it constantly supplies your body with the nutrients it needs to keep you burning fat for as long as possible throughout the day.

Performance Lab SPORT Fat Burner on the other hand is only for use before a fasted workout – this helps you get the most out of your training, and burn the most amount of fat during a fast, but also preserves muscle mass.

How your fat burner directs you take it matters.

The Manufacturer: Do they care about you, the customer?

Good looking ingredients and servings are one thing, but having the manufacturer respect you is another.

The supplement industry is huge now, a lot of companies appear to be into it for the money, not for the power of their product.

You need to find a manufacturer that cares about their product and your experience using it. This is a good sign that you’re going to get good results from taking it.

So what should you be looking out for?

Money Back Guarantees

This is a huge sign that your manufacturer believes in what they’re selling to you. If they’re offering a full refund if you don’t see the results you’re looking for this tells you two things:

1. They don’t get a lot of refunds – Which is a great sign that the product works.
2. They care about your results – They think their product is so good that they take all the risk.

Not a lot of companies offer this – mainly because they want to take the money and run. They’re in it for the long-haul, they know their product works and they want you to get the best out of them.

Instant Knockout, LeanBean and Performance Lab all offer money back guarantees. Instant Knockout and LeanBean ask that you use it for 3 months first, if you don’t see results you can send it back. Performance Lab take that one step further and say if you’re not satisfied by the end of the first 30 days you can send it back.

These are the kind of companies that we’re interested in.

Great Reviews

This is another good signal that the manufacturer takes pride in what they’re selling. If you see a lot of positive reviews online about a supplement, it has to be good.

Instant Knockout and LeanBean both have some incredible before and after shots which really show just how effective both these supplements are – and that includes me.

Here’s my results from taking Instant Knockout for 3 months:

You can read my full experience and results from using Instant Knockout over on my review here.

Now here’s Vicky, who took a course of LeanBean:

Again, fantastic results. You can see more of these in our LeanBean review here.

Final Summary & Quick Recap

Instant Knockout
– Our Score: 9.7/10 –

Best for…	Price	Ingredients	Dose	Proprietary Blends?	Safety	Guarantee
Overall	£35.00	9.7/10	9.7/10	No	9.7/10	90 Days

Want to learn more about Instant Knockout?
Read Our Review
or
– Visit Their Website –

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LeanBean
– Our Score: 9.5/10 –

Best for…	Price	Ingredients	Dose	Proprietary Blends?	Safety	Guarantee
Women	£35.00	9.3/10	9.5/10	No	9.5/10	90 Days

Want to learn more about LeanBean?
Read Our Review
or
– Visit Their Website –

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Burn Lab Pro
– Our Score: 9.4/10 –

Best for…	Price	Ingredients	Dose	Proprietary Blends?	Safety	Guarantee
Alternative	£39.00	9.4/10	9.4/10	No	9.4/10	30 Days

Want to learn more about Fat Burner?
Read Our Review
or
– Visit Their Website –