Instant Knockout vs Leanbean – Which One Is Better?

The purpose of this review is to address the facts surrounding the supplementation features of Instant Knockout vs Leanbean.

By breaking down what both of these fat burners provide in terms of quality of ingredients, dosage efficiency and price, it will be possible to conclude which out of the two is actually the better option on the market for consumers.

Rest assured that both Leanbean and Instant Knockout are two fat burners that are very respectable for the weight loss supplement industry. However, if it comes to picking between the two, you need to know which singles itself out as the better choice.

By the time you are done reading this Leanbean vs Instant Knockout piece, you should be an expert on all things to look out for when it comes to finding the best fat burner for you and your individual goals.

Want to lose weight and burn fat? Or, do you like both supplements but have no idea which of the two fat burner supplements is the better long term choice? Continue reading and find out everything you need to know about the market’s current most loved weight loss supplements. You will definitely thank me later.

Instant Knockout vs Leanbean: Company product backgrounds

Before I dive into which fat burner is the best here, I will also cover and introduce to you Instant Knockout and Leanbean individually, so that you are aware of everything there is to do with both brand entities, and how they came to be.

About Instant Knockout

Instant Knockout BoxInstant Knockout is one of the fat burners on the market that has some serious reputation for being one of the best options out there. Created in 2012, Instant Knockout CUT was originally made to help MMA fighters shred fat fast without losing their dense muscle mass or affect blood sugar and energy levels as a whole. Huge pro MMA/UFC athletes such as Greg Jackson advocate this product and have sworn by it for the long-term.

While the many marketing campaigns used to push Instant Knockout out there on the market are heavily orientated around male usage, the manufacturers of this fat burner made it to suit both male and females, making this a suitable female fat burner too.

The qualities that Instant Knockout CUT’s promotional framework boasts, include raised energy levels, appetite and craving suppression, in addition to thermogenic ingredients such as Cayenne Pepper, which has fat burning mechanisms.

The greatest thing about Roar Ambition supplements, is the fact that they are committed to continuously developing their formulas, so that it can be upgraded to the highest research and innovation that is available for the market. Meaning the formula will always evolve and be made the best it can be over time.

Roar ambition is not shy when it comes to wanting to conquer the market and competition out there.

About Leanbean

LeanbeanLeanbean was created and designed as a women centric fat burner, meaning it differentiates from Instant Knockout, which has been made for both genders. Leanbean was founded by a company named Ultimate Life, and each of their supplements are completely orientated around women’s everyday use. This is the biggest differentiation between the two supplements here, so keep that in mind!

According to the promotional pages of the supplement however, the fat burner supplement Leanbean, is vegan friendly, has multiple reviews and a large female following for the fat burning mechanism that it provides. Such a prestigious reputation has been amassed, despite the short time it has been available on the market for. Ultimate Life confidently believes that their supplement is a great supplement to have on your side for its weight-loss benefits.

While Leanbean is targeted towards female use and primarily for female fitness models, this does not mean that the formula has not changed over the years and isn’t suitable towards different lifestyles. Leanbean has become more and more mainstream, in addition to some transformations and elimination from Leanbean’s core ingredients list. Ultimate Life continuously upgraded their clinical research supporting their formulas, however now they believe that the Leanbean supplement at present, is one of the best gender specific supplements out there yet.

Which ingredients within both of the fat burner supplements are the best?

The answer to this question will come after evaluating the qualities of the Instant Knockout fat burner, with the fat burning qualities of Leanbean. Once you understand the effectiveness of both these supplements individually , you can then conclude which of these work best for your own personal goals. Therefore, there should be no problem in you creating your own criteria when it comes to taking one of these fat burner supplements. Make sense?

There will never be two fat burners on the market that are identical in what they can offer you, and it will come down to you and your personal preferences that will help you dictate what works the best for you in the long-term.

The fat burning supplement ingredients and nutritional facts

When it comes down to nutritional facts and the active ingredients of a fat burner, it is important to break down the main ingredients separately. Especially when it comes down to dosages and individual quantities that the ingredients come in. Some fat burners on the market these days have the right specialised ingredients, however the quantities can come lacking, meaning they will not have an overall profound effect. That often can be a problem. But don’t worry, I will address that more in regard to Leanbean vs Instant Knockout!

Instant Knockout ingredients

Instant Knockout supplement factsIn this section, I will analyse the main components of Instant Knockout, and the health benefits that are scientifically proven to be provided through this supplement’s main active ingredients. By the time you are done reading this section, you will be an Instant Knockout pro!

The first thing to address here is that Instant Knockout is a great formula, because its entire ingredients list is composed of natural ingredients, meaning it is free from proprietary blends all together. Similarly, just like Leanbean, the capsules here are also vegan friendly too.

The biggest plus about Instant Knockout is, there are only nine ingredients that make up your entire capsule. I repeat, nine-yes! This instantly should make you realise that Roar Ambition wants to focus on quality portions, as well as making sure they overfill and hit the spot for daily servings, rather than underserve. This gives me confidence as you know they have manufactured and really thought through the production process with the consumer in mind the entire time, which is as it should be, of course.

Caffeine Anhydrous (300mg)

Caffeine Anhydrous is a stimulant within Instant Knockout, and is ideal for heightening overall energy-mentally and physically. Additionally, the thermogenic attributes that it possesses will enable you to burn more than your resting metabolic rate. It will raise your temperature i.e. metabolic rate slightly, meaning the fat burning rate is subtly increased. While not excessive, this usually amounts to an extra 100-200 calories per day, and if you account this to a carefully tracked and managed calorie deficit, you are definitely on the way to seeing the results that you need overall.

Green Tea Extract (500mg)

Green Tea Extract is another well-known fat burning stimulant within fat burner supplements. Having been in the health and wellness spotlight for such a long time, the clinical trials to cover the health benefits it can provide are extensive. And yes, in the right quantities, it has proven to be a huge aid when it comes to enhancing fat loss as well as heightening a faster fat burning rate overall. The active mechanism is due to the ECGC component within the Green Tea. Fat oxidation excels massively from the catechins within Green Tea. Most studies have seen benefits from as little as 100 mg, meaning you are right on the money with the dosage provided by Instant Knockout. [2]

Glucomannan (1800mg)

Glucomannan is derived from the konjac root, and it has been used for many, many years-ancient times to be precise. In the industry today, Glucomannan is relied upon as one of the most powerful appetite suppressants out there. It has the reputation historically and medicinally for enhancing weight loss, and suppressing those cravings that can really compromise a strict dietary intake.

Instant Knockout is not shy in terms of dosage for this powerful weight loss tool, meaning if you were to apply this supplement under the right dietary circumstances, you will most definitely see the results promised from this fat burning supplement.

Cayenne Pepper (100mg)

Cayenne Pepper, like Glucomannan, is a natural ingredient that is heavily relied upon in supplements for losing weight. Similarly to Caffeine, it is a thermogenic compound that spurs on the process of fat oxidation and the breaking down of stored fat cells within the body. Cayenne Pepper can biologically propagate better use of fatty acids within the body for fuel. Multiple studies do support this as currently, intervention studies are in progress, where metabolic disorders such as obesity are being treated with Cayenne Pepper concentrations, because it has been proven to inhibit the circulation of intracellular fatty acids. [3]

L-Theanine (100mg)

L-Theanine is a known amino acid that has been scientifically proven to enhance the stimulation and health benefits that caffeine can provide when in circulation within the body. Not only does it enhance appetite suppression, it inhibits the likelihood of anxiety and palpitations that come as a side effect from consuming caffeine. [4]

Leanbean Ingredients: What is in the Leanbean fat burner?

Leanbean IngredientsWithin this section, I will analyse the main components of Leanbean and the health benefits that are scientifically proven to be provided through this supplement’s main active ingredients.

From an initial review to the ingredients, Leanbean similarly also does not use proprietary blends, meaning it has all natural based ingredients. Unlike Instant Knockout that provides a shorter dosage amount of four capsules per day, Leanbean needs to be administered 6-times a day, which coincidentally can be less versatile for some.

Additionally, it would be good to note that in terms of ingredients, there are more of them in this one. Instant Knockout hits the spot with just 9 active ingredients. Leanbean has a total of 12, which yes, is not significantly more than Instant Knockout, however it would be interesting to see if there are smaller doses of the active ingredients integrated within each and every serving.

This is something many supplement competitors do, and by using the false facade of more ingredients, it gives the idea that there is more ‘effect’ or increased health benefits to the consumer. However, that is far from the truth as we know that the doses of these active ingredients need to be at certain essential amounts to affect health and give the desired effect as a weight loss aid.

It is also worth mentioning that if you were hoping for a kick of Caffeine from Leanbean you will be disappointed, as there are no significant portions of any thermogenic substances within the formula. While the reasoning behind it is scientifically logical and appropriate for the supplement’s target market (women metabolise caffeine more rapidly than men), many do seek out the attributes of an energy source and boost in fat burners. You will have to do without that attribute, in addition to two key missing thermogenic substances Green Tea and Cayenne Pepper.

The question is, what are the alternative ingredients within Leanbean that can level-up the quality of ingredients, so it too can be on the same playing field of Instant Knockout?

Glucomannan (3000mg)

In Leanbean, There is almost double the initial serving amount that we see in Instant Knockout. Having, of course, already being aware of the benefits of Glucomannan, this will help you hold your stomach’s cravings in between meals.

Green Coffee (50mg)

This active component in unroasted coffee beans (chlorogenic acid) is known to reduce fat absorption during the fat transportation biological processes. However, it may intrigue you to know that Instant Knockout also includes this ingredient-but at double the dose.

Choline (82.5mg)

Choline is yet another relatively popular fat burner ingredient, and an essential nutrient that you need to supply through diet to prevent deficiency. Its prime function in Leanbean however, is that it can motivate fat loss in the process of fat metabolism and thus the utilisation of it as a fuel source.

While studies are still overall inconclusive medically, multiple clinical trials have indicated that correct supplementation can make choline a weight loss aid due to its contributing effects on leptin and satiety. For that reason more and more athletes have begun to introduce this supplementation as an aid for rapid weight loss leading up to competitions. [5]

Turmeric (200mg)

Turmeric is a known anti-inflammatory within the wellness community, yet it also has thermogenic properties. Therefore, I have concluded that Turmeric has been purposefully added as a replacement for the Caffeine and other missing substances that are often used within fat burners, due to Leanbean being primarily for women. For those of you that are not aware, caffeine can not always be agreeable to women, depending on which part of their menstrual cycle they are on, and being that women are supposed to take this everyday, it would make sense that Ultimate Life took it out of the formula completely.

However, while Turmeric is powerful for its all-round health properties, it still is not as significant as the all-round antioxidant/thermogenic combination of Green Tea, Cayenne Pepper and Caffeine unfortunately.

Vitamin B6 (1.7mg) and B12 (2.4mcg)

The Vitamin B complexes are always great to see, especially when a supplement is targeted towards women. This supplement is essential for hormone regulation and the function of women’s health. Many women can easily be undernourished when it comes to having this within their body due to their menstrual cycles. It is a no-brainer that they would include this in a formula designed for women.

Which ingredients profile is better? – Instant Knockout

Instant Knockout ProfileWhen it comes to who will be taking the crown for the best ingredient profile, it has to go to Instant Knockout. If this comparison was solely based on the best fat burners for women, then Leanbean would make the cut. However, Instant Knockout’s all-round thought out formula makes it the most versatile for everyday consumption. It is very typical for those that take a fat burner, to be in a calorie deficit. When you are reducing a large degree of your energy intake, maintaining your energy levels can be a struggle. Instant Knockout’s manufacturing team has read between the lines and made sure consumers get the energy boost they need from both the Green Tea and Caffeine sources. Unfortunately, Leanbean does not conform to that desirable and important factor.

How to take the Leanbean and Instant Knockout fat burners

To take both these fat burners, you will need to account for more servings per day when taking Leanbean. Leanbean comes equipped with 180 capsules for a month’s worth of servings. Whereas Instant Knockout provides 120 tablets for the same dosage time frame. You will need to supplement 6 capsules of Leanbean daily (2 tablets 3 times a day), or only 4 tablets a day (at a time of your choosing) for the Instant Knockout. It may be a wise decision however, to not take Instant Knockout too close to bed time, due to the caffeine dosage it provides.

Instant knockout vs Leanbean side effects

Instant knockout vs Leanbean side effects

When it comes to taking supplements, they are sometimes known to have potential side effects that consumers should be aware of. However, due to the fact both Leanbean and Instant Knockout are manufactured free from proprietary blends, the natural formulas mean there is nothing too significant to worry about.

However, those sensitive to coffee should definitely take Instant Knockout with careful consideration. Even though the supplement is still below the daily recommendation of caffeine for adults, it can be easily overdosed if you are already an avid coffee drinker. To prevent the possible side effects of anxiety, palpitations and migraines, do take into account your daily supplement dosage with your usual coffee intake. While the L-Theanine is great for combating the possible effects of jitters and palpitations, you may still be affected from the intake of this stimulant.

Instant knockout vs Leanbean pricing

Pricing is always an important factor when weighing up any supplement buying options, I am sure anyone would agree. When it comes to comparing Leanbean vs Instant Knockout, there is no significant range between them, it literally comes down to the difference of a few pounds.

Lean Bean Costs:

  • One bottle: £39
  • Two bottles: £78
  • Three bottles: One free bottle + added included free delivery for £117

Instant Knockout Costs:

  • One bottle: £35
  • Two bottles: £70
  • Three bottles: One free bottle + added included free delivery for £110

Which of the fat burning supplements is the cheapest? – Instant Knockout

Instant Knockout is clearly the winner for this category. While it only came down to a matter of a few pounds, it may be worth mentioning that Instant Knockout would still have an edge even if it was a little bit pricier. This is down to the quality of ingredients and the great doses provided, of the active and important fat burning substances per serving.

Leanbean vs Instant Knockout

Overall Summary

Instant Knockout benefits

  • Proprietary-free natural blend.
  • Suitable for both men and women.
  • Perfect weight management supplement.
  • Caffeine to give consumers an energy boost.
  • L-Theanine to counteract caffeine side effects.
  • Great appetite suppressant to manage cravings in between meals.
  • Thermogenic ingredients to boost metabolism, burn fat and lose weight.

Leanbean benefits

  • Proprietary-free natural blend.
  • Supplement made with women in mind.
  • Perfect weight management supplement.
  • Subtle and side-effect free ingredients list.
  • Great appetite suppressant to manage cravings in between meals.

 Instant Knockout Cons

  • Caffeine dose is slightly high, meaning possible side effects for sensitive consumers.

Leanbean Cons

  • Lacks any highly effective thermogenic ingredients meaning metabolism will not be boosted massively to aid the burning of more calories.

My Verdict: Instant Knockout fat burner wins

Instant Knockout Wins

While Leanbean is undoubtedly a great contender, I do feel that its lack of certain essential ingredients is what really let it down here.

The Instant Knockout CUT ingredients are leading substances within clinical research, and have proven to be very effective when it comes to aiding the loss of weight.

While both Instant Knockout and Leanbean have the perfect remedy for suppressing appetite, thermogenic substances are vital ingredients for those really looking to make exceptional weight loss, in addition to giving the body a natural energy boost.  Meaning, Instant Knockout wins!


  1. Morris, S. and Wilson, D., 2021. Caffeine Anhydrous vs. Caffeine: What’s the Difference?. [online] Healthline. Available at: [Accessed 27 October 2021].
  2. Semeco, A., Northrop, A. and Warwick, K., 2021. 10 Benefits of Green Tea Extract. [online] Healthline. Available at: [Accessed 27 October 2021].
  3. Zheng, J., Zheng, S., Feng, Q., Zhang, Q. and Xiao, X., 2017. Dietary capsaicin and its anti-obesity potency: from mechanism to clinical implications. Bioscience Reports, [online] 37(3). Available at: [Accessed 27 October 2021].
  4. Mehta, F. and Fontaine, D., 2021. What You Should Know About the Benefits and Risks of L-Theanine. [online] Healthline. Available at: [Accessed 27 October 2021].
  5. Elsawy, G., Abdelrahman, O. and Hamza, A., 2014. Effect of Choline Supplementation on Rapid Weight Loss and Biochemical Variables Among Female Taekwondo and Judo Athletes. Journal of Human Kinetics, 40(1), pp.77-82.

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