LeanBean vs Instant Knockout Cut (2024 Upd.) Choose Right

Lisa Lorraine Taylor, BSc, CPT
Published by Lisa Lorraine Taylor, BSc, CPT | Staff Writer
Last updated: February 1, 2024
We personally test every product featured in our reviews and guides. By ordering products anonymously and getting a group of independent testers, we are able to get first-hand experience and provide data-driven recommendations. Learn more.

As a personal trainer, one of my main challenges working with female clients is finding the right supplements for the specific requirements of women.

So many fat burners have either the wrong ingredients or a dosage that is way too high. That's why I was delighted to see that Leanbean has a formula specifically designed for females.

That prompted us to find 11 volunteers who helped to test Leanbean, and my dietitian did extensive research into the ingredients for this review.

What Is Leanbean?

A LeanBean supplement and a person working out in the behind

According to Ultimate Life, LeanBean is a “clinically proven fat burner for women,” containing ingredients and dosages best suited to average women's weight loss.

This has actually been one of our greatest criticisms of fat burner supplements in general, in that they are pretty much always provided in a way that makes them too strong for female athletes.

The results can sometimes be some side effects like upset stomach or jitters from too many fat burner stimulants.

So, we all welcomed the arrival of a workout product designed specifically with women in mind.

I’ll get to the specific ingredients shortly, but the good thing is that it’s based on natural ingredients, This greatly reduces the risk of toxin exposure, and makes it a lot easier to determine if you have any possible allergies.

It’s recommended to take 6 capsules per day: 2 during breakfast, lunch, and dinner, respectively.

You can check out our thorough review on LeanBean for more insight into the product.

Our Recommendation For Women


Rated With Total Shape's Scoring System

  • Green Coffee Bean Extract doubles fat loss in 8 weeks
  • Vegan-friendly, caters to diverse dietary preferences
  • Supports higher training volume, beneficial for workouts
  • Positive feedback for reducing snacking and boosting energy
  • Get the BEST PRICE until the end of April
  • Six pills a day can be cumbersome and easy to forget

What Is Instant Knockout Cut?

Instant Knockout Box

Instant Knockout Cut is a fat burner especially designed for bodybuilders and performance athletes.

With that said, there is no reason why this product won’t work for other people to take advantage of the fat loss benefits.

Roar Ambition has designed the Instant Knockout fat burner formula to work at it’s best when combined with a healthy diet and a fitness routine that involves training several days a week.

It should not be mistaken for one of the snake oil products that you sometimes see advertised on social media.

You’ll still have to put in a reasonable amount of effort for it to work.

Very similar to LeanBean, Instant Knockout fat burner is based on natural ingredients that have been scientifically researched to demonstrate they are effective at burning away the flabby stuff.

See this page for our full review on Instant Knockout.

Our Recommendation For Men

Instant Knockout Cut

Instant Knockout Cut

Rated With Total Shape's Scoring System

  • Glucomannan suppresses appetite, reduces cravings​
  • Black pepper extract enhances absorption and effects of other ingredients
  • Positive feedback for energy boost and mental alertness
  • Increases thermogenesis, enhancing calorie burn
  • Get the BEST PRICE until the end of April
  • High caffeine content (300mg/day) not suitable for sensitive individuals

Our Testing Approach

In our quest to understand the efficacy of Leanbean and Instant Knockout Cut, we enlisted a diverse group of volunteers, both men and women. Given that Leanbean is specifically formulated for women, we focused that research and testing on female participants.

We organized our participants into two balanced groups, ensuring an even mix of genders in each. Over a span of four weeks, both groups diligently followed their respective supplement regimens.

Before embarking on this journey, we meticulously recorded details such as their existing diet, workout habits, body fat percentage, and current weight loss pace to establish a clear starting point.

The feedback was overwhelmingly positive from both factions, with tangible fat loss evident from their body metrics. And the results highlighted that men and women have some good choices to make.

What Ingredients Do Leanbean and Instant Knockout Have in Common?

Leanbean and Instant Knockout common Ingredients of the product

The common ingredients that Leanbean and Instant Knockout have in common are glucomannan, vitamins B6 & B12, chromium, zinc, piperine, and green coffee bean.

Our testing team has also confirmed that these ingredients helped them increase calorie burn more consistently.

1. Glucomannan

A meta-analysis of 134 studies in Science Direct showed that glucomannan helped overweight and obese adults lose weight [1]. It has been shown to help with appetite suppression and to increase the effectiveness of your digestive system.

2. Vitamins B6 & B12

These vitamins are helpful for both the regulation of metabolic rates as well as combating tiredness. For busy people trying to fit in some extra workouts, this can make a difference.

3. Chromium

One study from The Science of Diabetes Self-Management and Care journal showed that supplementation of 200–1,000 mcg of chromium as chromium picolinate a day could improve blood glucose control [2]. This can contribute to a more balanced blood sugar level and better weight management.

4. Zinc

Generally speaking, zinc is useful for digestive and metabolic processes that involve fat and fatty acids. For men, it also plays a role in testosterone levels.

5. Piperine

You might have noticed this on more supplements lately. Basically, it helps make your digestive system more effective at absorbing micronutrients.

6. Green Coffee Bean

The final common ingredient is green coffee bean. While it contains a small amount of caffeine, it is contained in these products for its antioxidant properties that help remove toxins.

Their Unique Ingredients

While there are quite a few overlapping ingredients, a couple should be highlighted as unique to each fat burner.

Instant Knockout Cut Ingredients

1. Green Tea Extract

I was quite surprised to hear that it can help with fat oxidation [3]. Personally, I hate the flavor of green tea, so it’s great to see some extract in Instant Knockout.

Check this video below to know more about Green Tea Extract.


2. Caffeine Anhydrous

This is possibly one of the big advantages of Instant Knockout as caffeine is one of the more powerful thermogenics.

Just be careful with any coffee you drink during the day to avoid any jitters. Caffeine anhydrous is a much more concentrated form, thus may cause crashes if taken in excess.

I only take this supplement in the morning, and it has delivered great results.

3. Cayenne pepper

Cayenne pepper is a well known thermogenic [4]. By increasing your body temperature slightly, Instant Knockout can help you get rid of some extra fat.

LeanBean Ingredients

There are a few more extra LeanBean ingredients when compared to Instant Knockout.

1. Choline

Being able to release fat cells is only one part of the puzzle, but getting that fat transported and transformed into energy is just as important. Choline is a nutrient that studies have shown to help with this delivery process [5].

Most of our female testers reported that they gained a lot of energy throughout the day.

2. Chloride

This electrolyte plays a role in keeping you hydrated. Your digestion and metabolism can significantly suffer if you don’t maintain an optimum level of hydration.

3. Turmeric

This is a spice that I have been taking for a long time, mainly for its effects on brain functionality and motivation. However, it is also one of the top thermogenics after caffeine.

"Turmeric works as a supportive supplement for improving the body’s health, so it can work to lose weight on its own. It isn’t meant to be used as any kind of overnight gimmick to shed pounds quickly."

- Vitagene.com

4. Garcinia Cambogia

This Asian fruit has become increasingly popular and more commonly stocked in health food stores and even farmers’ markets. The main reason for including it in LeanBean is for its appetite-suppressing properties.

5. Acai Berry

While the true effects of this berry are still not fully understood, there are some early study indications that it can impact metabolic rates [6]. And because it is a completely safe product, there is no real downside to including it.

Ingredient LeanBean Instant Knockout
Garcinia Cambogia
Acai Berry
Green Tea Extract
Caffeine Anhydrous
Cayenne Pepper
Vitamins B6 & B12
Green Coffee Bean

Do Leanbean and Instant Knockout Have Any Potential Side Effects?

A man experiencing side effects

No, both Leanbean and Instant Knockout don’t have any known side effects when they are taken as recommended. This is backed up by the companies' claims (Ultimate Life and Roar Ambition) and the hundreds of website review comments where men and women didn’t report any problems unless there were allergies to some of the ingredients.

Our testing team also confirmed that they didn't experience any negative effects.

That being said, one of the side effects some women might experience when taking the full amount of Instant Knockout is overstimulation as it has quite a lot of caffeine.

This can impact your sleep, so be careful with the dose and timing or opt for a good fat burner without caffeine.



From a pricing perspective, LeanBean and Instant Knockout have very similar offers. Each bottle is a months’ supply at a price of $59.

However, there are excellent special offers where you can buy 3 bottles and get a fourth one for free at a price of $185.

One bottle of Leanbean fat burning supplement contains 180 capsules, which is good for one month. We ordered several times during the testing phase and delivery usually took only four days.

Now, as a woman, you could save a bit of money if you purchase Instant Knockout and reduce the daily dosage. This won’t impact your fitness goals too much, but you would need to do some testing to figure out the optimum dose.

I would also recommend that you only purchase these products on their company websites, as that’s the only place you’ll get the money-back guarantee.

You can access the LeanBean website here and Instant Knockout website here.

Natural vs. Synthetic Ingredients in Fat Burners

Natural ingredients in fat burners, derived from herbs and plant extracts, have been used for centuries for their medicinal properties. They are often perceived as safer and more holistic. Examples include green tea extract and garcinia cambogia.

On the other hand, synthetic compounds are laboratory-made and designed for specific effects, such as increased metabolism. While they can offer potent and targeted results, there's a potential for side effects.

Some individuals prefer natural ingredients, valuing their organic nature and historical use. Others opt for synthetic compounds, seeking rapid and pronounced effects. Ultimately, the choice hinges on personal preferences and health considerations.

Myths and Misconceptions about Fat Burners

One pervasive myth about fat burners is that they're a "magic pill" guaranteeing weight loss without effort. In reality, these supplements are designed to complement a balanced diet and regular exercise, not replace them.

Another misconception is that all fat burners are detrimental to health.

While some products, especially those with unregulated ingredients, can pose risks, many are formulated based on scientific research and are safe when used as directed.

It's essential to consult experts and rely on scientific evidence rather than hearsay. Educated choices, combined with a holistic approach to health, ensure the effective and safe use of fat burners.

Potential Drug Interactions with Fat Burners

Fat burners, while beneficial for many, can interact with certain medications, potentially diminishing their efficacy or exacerbating side effects.

For instance, fat burners containing caffeine might interfere with blood pressure or heart medications [7]. Additionally, those with ingredients like garcinia cambogia could interact with diabetes medications, affecting blood sugar levels.

Some fat burners might also amplify the effects of anticoagulants, posing bleeding risks.

Given these potential interactions, it's paramount to consult with a healthcare professional before introducing any supplement into one's regimen. Their guidance ensures that individuals can safely benefit from fat burners without compromising their overall health.

Making the Right Choice

Two healthy and fit individuals happy with their choice

For men and performance athletes looking to lose weight and get through a cutting phase faster, out of all fat burners, your top pick should be Instant Knockout Cut.

Now, you might wonder how we managed to reach an agreement here at the office in the Instant Knockout vs LeanBean debate.

Basically, it all came down to looking at the fat burner supplements from a gender and goals perspective and analyzing the results provided by our testing team.

Unless you’re a high-performance or professional female athlete, LeanBean is going to be the best option for women. It has the right ingredients in just the right amounts, meaning you need not halve the dosage or worry about inaccurate doses.

But then, which metabolic type are you? Find out if you are a sugar burner or a fat burner type.

Other Leanbean Comparisons:


FAQ Banner

How do you take LeanBean & Instant Knockout Cut?

You take fat burners usually in the form of pills and ideally spread out over the day with your meals. Most fat burning supplements recommend taking them with breakfast, lunch, and an afternoon snack so that you get the best continuous results.

Can you drink coffee with fat burners?

Yes, you can drink coffee with fat burners, but you have to be careful with your total caffeine intake. For one, it can give you jitters and insomnia.

But, once you exceed a certain daily amount on a regular basis, your body will become desensitized and the effects won’t be as noticeable.

Is Instant Knockout thermogenic?

Yes, Instant Knockout is a thermogenic fat burner. With caffeine and cayenne, it will raise your core body temperature slightly.

And the energy for this process is gained from releasing fat cells. With all these effects, expect to lose weight more effectively when working out.

Is LeanBean thermogenic?

Yes, LeanBean is a thermogenic supplement, but it’s not reliant on caffeine to achieve this. It’s a combination of cayenne pepper and turmeric that help to kick your fat burning metabolism into shape.

Can you take Instant Knockout without food?

Yes, you can take Instant Knockout without food; however, when you first start taking it, I would advise that you don’t take it on an empty stomach. Try it out for a few days and see if it agrees with you first.

Can you take LeanBean without food?

Yes, you can take LeanBean without food, however, just like with Instant Knockout, it’s best to take it with a meal. While it may not be as harsh on your stomach, it’s best to stay on the safe side and see how your body reacts first.

Our Verdict: Which Fat Burner Should You Choose?

Choosing the right fat burner depends on your gender and goals. For men and high-performance athletes, Instant Knockout Cut offers optimal ingredients for a cutting phase.

For women aiming to shed some unwanted fat, a great alternative to LeanBean is PhenQ, which provides a tailored formula for effective fat loss.

Consider trying PhenQ and sharing your progress with before and after pictures on social media.

Our Recommendation For Women



Our Recommendation For Men
Instant Knockout Cut

Instant Knockout Box

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About The Author

Lisa Lorraine Taylor, BSc, CPT
Staff Writer
Lisa Lorraine Taylor, BSc, CPT holds a BSc degree in Holistic Nutrition from Clayton College of Natural Health and is the owner of Taylor Made Fitness. Her philosophy centers on cutting through the hype and misinformation surrounding dietary supplements, focusing instead on practical, science-backed strategies for health and weight loss.
Learn more about our editorial policy
Dr. Harshi Dhingra, MBBS, MD is a published peer-reviewed author and renowned physician from India with over a decade of experience. With her MBBS from Bharati Vidyapeeth and an MD from Rajiv Gandhi University, she actively ensures the accuracy of online dietary supplement and medical information by reviewing and fact-checking health publications.
Learn more about our editorial policy
Dr. Kristy June Dayanan, BS, MD is an author with a BS degree from University of the Philippines and an MD from University of Perpetual Help System. Her ability to simplify medical science complexities and dietary supplement jargon for the average reader makes her a valued medical fact checker and reviewer.
Learn more about our editorial policy

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