Best Fat Burners 2021

Our guide to some of the leading Fat Burning supplements on sale

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Last updated: 10th March 2021

This is our expert guide to the best fat burners on the market. These popular food supplements (typically made from plant extracts) aim to help transform the way you look and feel. Remember, there’s no such thing as a magic pill. But alongside a healthy diet and exercise regime, the best products could help you achieve your goals in less time.

The current fat burning supplement market is a competitive one, with many products claiming to be the ‘best’. And we understand if you’re finding it tough to make sense of it all. We’ve scoured the web, cut through the marketing hype and reviewed our best product picks for 2021 below.

  • Cut through the hype
  • Make the right choice for you
  • Achieve your goals faster

Our top picks for 2021

Editor’s Choice

Instant Knockout CUT

  • Natural ingredients
  • Endorsed by MMA athletes
  • Popular across the globe
  • Vegan friendly
Hunter Burn
  • Optimized doses in formula
  • Said to burn fat, not muscle
  • Premium, natural ingredients
  • No artificial colors or fillers

Hourglass Fit

  • Stim-free for those with sensitivities
  • Powerful ingredients
  • Blocks hunger
  • Vegan friendly
  • Free US and UK delivery

Transparent Labs Stim-Free Fat Burner

  • Stim-free formula
  • Encourages higher fat burn
  • Clean and natural ingredients
  • May boost mood

    Burn Lab Pro 

    • Safe, natural formula with no stimulants
    • Stimulates metabolism 
    • Promotes muscle gain
    • Vegan friendly

    Full reviews

    Knowledge is key – take an in depth look at our reviews below

    [Disclaimer: We do not make any guarantee of specific results and that the results can vary]
    Editor’s Choice

    Instant Knockout CUT

    Our number 1 Fat Burner 2021

    Editor’s Choice

    Overview

    Instant Knockout CUT is one of the most popular supplements you’ll find online in 2021. The internet is flooded with positive reviews and customer testimonials vouching for the quality of the formula. Most reviewers say it works best as part of a healthy workout and nutrition plan.

    Sold as a capsule rather than a powder, Instant Knockout boasts happy customers all over the world and continues to grow in popularity.

    Like a lot of supplements, these capsules are aimed at bodybuilders and athletes. But search for reviews online, and you’ll see that men and women of all shapes, sizes and walks of life love Instant Knockout CUT.

    What’s in it?

    Instant Knockout CUT contains green tea[1] and cayenne pepper[2]  – both staples of many popular fat burners. These ingredients are said to help burn more calories, which could lead to faster results. Instant Knockout also contains glucomannan, a fiber which may promote fullness and reduce food cravings[3]. These ingredients are joined by vitamin B6 and B12, vitamin D3, L-theanine and piperine. Vitamin D3 helps to block the formation of fat cells and suppresses lipid storage [17] leading to less fat accumulation while L-theanine complements caffeine for a clean lift [18]. The result? A natural supplement without any risky substances – and one that could help you achieve your goals faster.

    Want to try Instant Knockout?

    How to take it

    Each bottle of Instant Knockout CUT contains 120 capsules. According to the manufacturer’s instructions, you’ll get best results by taking it four times a day – once in the morning, lunch, in the afternoon and before your evening meal.

    Cons

    Conclusion

    Instant Knockout CUT looks great – but all the signs suggest it offers much more than eye-catching packaging. The product can help support your training goals, boost confidence and keep you motivated for longer as part of a good diet and exercise routine. No proprietary blends and transparent formula are big bonuses and make this product stand out on our list!

    Hunter Burn

    Overview

    Hunter Burn is described as a ‘premium’ fat burner. It’s aimed at the top end of the market and is designed for those looking for larger doses and higher quality ingredients. This comes at increased cost – but does it deliver? Hunter Burn features the largest serving sizes we’ve ever seen, while also using more potent forms of certain key ingredients. Some will want the cheapest on the market. But this is a highly-researched formula for men who are happy to pay more to get the best.

    What’s in it?

    Hunter Burn contains the key ingredients you’ll find in other products, but at much higher doses. For example, it contains matcha green tea, a variant of the green tea extract you find in other products. The difference is this type of green tea is three times stronger[4] – and (in theory) it could help burn calories even faster. Hunter Burn also contains konjac root, which is said to reduce hunger. To finish off, a good dose of vitamin D3 is thought to help you lose weight, but gain muscle[5]. The larger servings make up for the high price, giving you a range of meticulously-researched ingredients in optimal amounts.

    Want to try Hunter Burn?

    How to take it

    Each daily serving is six capsules, and there are 30 servings per container, giving you a month’s supply. The directions on the label state that you should take two capsules with a large glass of water three times a day before your main meals. As with any supplement, you’ll need to take it for a couple of months alongside a healthy fitness program and diet to give your body time to adjust. If you have any pre-existing conditions, remember to seek medical advice before taking any supplements.

    Cons
    • Only available direct from the manufacturer
    • High price point

    Conclusion

    As with any supplement, you need to make sure the ingredients are safe, natural, carefully selected and in the right amounts. Hunter Burn seems to meet these criteria and even though it costs a bit more, you seem to get what you pay for. A supplement for those who are quality conscious.

    Hourglass Fit

    Overview

    Third on our best fat burners list is Hourglass Fit, a 120 capsule fat burner which has an impressive selection of ingredients and attractive looking packaging. You might be put off by some of the more female orientated aspects of the product, including the marketing and the look of the brand, but don’t be. There’s no such thing as a gender specific fat burner. Men and women’s bodies are almost identical so there’s no reason why this product won’t work for any man. The best way to prove this is to look at the ingredients. As you’ll see, they’re common in many male targeted fat burners.

    What’s in it?

    Hourglass Fit contains a great ingredient portfolio, enough to stand out against many of the market-leading fat burners. For instance, you’ll find a generous dose of glucomannan, a root extract that swells when it hits your stomach and stops you from getting annoying hunger cravings between meals[6]. As well as this, your appetite is kept well under control with the addition of 5-HTP. This compound is known as a natural precursor to serotonin, a brain chemical which has been shown to offset hunger-inducing hormones, helping you control your food intake[7].

    Also inside is cayenne pepper, a known thermogenic that works to heat up your body, boost your metabolism and help you burn more calories in less time[8]. It also contains a range of vitamins including zinc, vitamin B6, and vitamin B12. In addition, black pepper extract ensures your body absorbs the other vital nutrients in the formula.

    Want to try Hourglass Fit?

    How to take it

    Each bottle contains 120 capsules, giving you plenty of fat burning pills for a calendar month. To get the best effects you should take one capsule four times a day.

    Cons
    • Only available direct from the manufacturer

    Conclusion

    Hourglass Fit is a great choice for a fat burner to help anyone, despite being marketed at women. Ignore the packaging and look at the list of ingredients and the product. It’s clear to see the creators have put a lot of thought into this supplement, even making the capsules vegan friendly. The ingredients complement each other perfectly to target every aspect of the weight loss process.

    One thing to note is that Hourglass Fit doesn’t contain any stimulants. If you struggle with motivation levels when on a low-calorie diet, the absence of a stimulant may mean Hourglass Fit won’t work for you. However, if you are sensitive to stimulants, you’ll likely get on with this supplement very well. Overall, Hourglass Fit is a fantastic product with a top selection of ingredients and we’d highly recommend it for anyone serious about buying a fat burning supplement in 2021.

    Transparent Labs Stim-Free Fat Burner

    Overview

    You should be familiar with the name Transparent Labs if you’re into your supplements. The company develops a range of products that are completely natural and packed full of potent, science-backed ingredients. PhysiqueSeries Fat Burner Stim-Free is one of its most popular weight loss options. With it, you’re provided with a clean formula that excludes stimulants to promote higher fat burn and block hunger. A blend of plant-based ingredients support your body’s natural fat burning ability to help you lose more weight.

    What’s in it?

    Inside PhysiqueSeries Fat Burner are 6 quality ingredients that work to boost fat loss. Thermogenic cayenne pepper[9] and amino acid L-carnitine[10] heightens fat loss by boosting lipolysis, the burning of fat for fuel. Forslean also helps to reduce body fat percentage by encouraging the release of fatty acids from stubborn fat tissue[11]. Instead of stimulants, it uses a blend of B vitamins to give you a gentle energy boost. 5-HTP[12] and rhodiola rosea[13] are also in the mix to regulate your mood and increase overall wellbeing.

    Want to try Transparent Labs Stim-Free?

    How to take it

    Simply take two capsules twice a day with a large glass of water, an hour before a meal.  Transparent Labs also tell you to start with one capsule, twice daily, to ‘assess tolerance and response’ for the first three days. As always, you should follow the guidelines given to ensure you have a safe and effective experience.

     

    Cons
    • Only available direct from manufacturer
    • High price tag

    Conclusion

    PhysiqueSeries Fat Burner Stim-Free is a good stim-free option and contains a well-studied formula. The natural fat burning ingredients combine to boost the rate of thermogenesis and lipolysis, whilst dealing with the way your body handles stored fat. By amplifying the rate at which you use fat for fuel, you may experience some good fat loss with this product. It’s a great option for anyone sensitive to stimulants and those who struggle with low mood and motivation when on a calorie restricted diet plan.

    Burn Lab Pro

    Overview

     Another stim-free option, Burn Lab Pro aims to raise your metabolism and overall calorie burn while maintaining muscle mass. When used alongside fasted training in particular, Burn Lab Pro works to help you train at a higher intensity and rid your body of stubborn fat. This could be the ideal solution if you’re looking to burn more fat but gain more muscle.

    The creators claim Burn Lab Pro has the cleanest fat loss label on the market, with a completely natural and transparent formulation. How do the ingredients maximize your results? Let’s find out.

    What’s in it?

    The Burn Lab Pro formula combines ‘today’s 5 top ingredients for fat loss, training intensity, muscle gain and more’. Inside you’ll find an entirely natural and clean list of ingredients which promote safe weight loss. Popular thermogenics cayenne pepper and Bioperine work to speed up your metabolism[14]. Ayurvedic root herb Coleus forskohlii is linked to weight loss by activating an enzyme that increases cAMP, a signaling compound that promotes lean body composition[15]. Beta-hydroxy beta-methylbutyrate (HMB) is also a good inclusion, as it works to neutralize enzymes that cause muscle damage when training, improving strength gains through protein synthesis[16].

    Want to try Burn Lab Pro?

    How to take it

    You get 90 capsules in each bottle of Burn Lab Pro which is around a 22-day supply if you take the maximum recommended dose of four capsules per day. Burn Lab Pro recommends that you take two to four capsules, around 30 minutes before you hit the gym. As always, follow the product label’s directions carefully and never take more than it says.

    Cons
    • Slightly expensive
    • Added vitamins would help

    Conclusion

     Burn Lab Pro is a simple yet effective formula designed to be taken alongside a healthy diet and training regime. There are some high-quality, well-researched ingredients in the mix and we have no doubt that it’s safe to use for a long period. If you’re a little sensitive to stimulants, you’d be glad to know Burn Lab Pro is 100% caffeine-free. If you’re looking for an extra boost alongside your training Burn Lab Pro is a good option.

    Our Top Picks

    Still can’t decide? Go back to the top and take a look at our top picks.