Instant Knockout Cut Review (2024's Unbiased Report)

Benedict Ang, CPT, PN1-NC
Published by Benedict Ang, CPT, PN1-NC | Staff Writer & Senior Coach
Last updated: January 30, 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 fitness instructor, I work with many high-performance athletes daily. It's usually a mix of bodybuilders and ordinary people who need help with their health and fitness goals.

I've also started working with MMA fighters recently, and one of my clients introduced me to Instant Knockout. While I'm a fan of fat-burning supplements, I'm also very cautious of all the dodgy weight-loss supplements out there.

However, because of the results I have witnessed, I decided to do some more research and had a few clients act as a test group.

Rated : 4.9/5
Ingredient Quality
Product Effectiveness
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User Ratings

Key Information

  • Made with all-natural ingredients
  • Contains a high dose of stimulants
  • Need to take four pills per day
  • Also suitable for females
  • Only available on the official website


  • Caffeine Anhydrous
  • Green Tea Extract
  • Cayenne Pepper Seeds
  • L-Theanine
  • Glucomannan
  • Piperine
  • Vitamin B6
  • Vitamin B12
  • Vitamin D3

How It Works

  • Assists in fat-burning and weight management
  • Increases mental energy levels and focus
  • Suppresses the appetite
  • Activates thermogenesis

What is Instant Knockout?

A box of Instant Knockout supplement

Instant Knockout fat burner is a cutting-edge weight loss supplement manufactured by Roar Ambition. This product may help athletes get rid of fat, build more muscle, and support weight loss.

While it was initially developed for MMA fighters and professional boxers, its revolutionary formula of natural, scientifically proven ingredients works well for ordinary people who want to bulk up a bit or lose weight.

Update Aug 2021** Instant Knockout gets rebranded to Instant Knockout Cut. Some ingredients like zinc, chromium and green coffee bean extract were removed and replaced with L-theanine and vitamin D3. They also moved from red capsules to clear capsules to make the product cleaner by removing the Red40 food dye since customers were asking for that.


Brand Information

In 2014, a UK-based parent company named Roar Ambition developed Instant Knockout. It's a company that specializes in natural supplements for sports performance. They keep their fat burner formulation up to date by modifying it regularly.

A UFC champion and MMA legend, Diego Sanchez was one of the first competitors to benefit from Instant Knockout. He's a combat sports champion, UFC Hall of Famer, and multiple award winner.

What Makes Instant Knockout Unique?

What makes Instant Knockout unique compared to other similar products is the fact that it is designed to assist athletes and bodybuilders in losing weight while maintaining muscle mass.

Instant Knockout is a popular fat burner designed to help individuals burn fat and lose weight while preserving muscle mass.

My suspicions about Instant Knockout were reduced when I saw a lot of backing from MMA fighters and coaches like Diego Sanchez and Greg Jackson.

What Are The Benefits Of Instant Knockout?

Fit athlete doing dips exercise

Based on 1st hand experience, the benefits of Instant Knockout are its effectiveness in weight loss without unnecessary side effects, provided by all-natural ingredients.

1. Fat Loss

Instant Knockout fat burner contains ingredients that help with fat burning and losing weight and control the process that stores body fat in the first place.

After three months of using the Instant Knockout fat-burning supplement, it's one of the products I recommend to my clients trying to cut. It helped me reach my goal days early during my two cutting phases.

2. Increased Energy Levels

When your body burns more fats, more energy is released to fuel different parts of your body.

But I found in many different Instant Knockout reviews that people also noticed a good increase in mental energy levels and focus.

I noticed higher energy levels throughout the day just within the first week of using Instant Knockout and better focus and mental alertness at work.

  • Strong dosage of caffeine from green tea extract for mental performance and thermogenic effects for weight loss
  • A nice dose of glucomannan to help as an appetite suppressant
  • Includes cayenne pepper, which works as a fat burner
  • You’ll need a reminder to take 4 pills per day

Our #1 Recommendation

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Instant Knockout

Is Instant Knockout Safe?

Based on my personal experience, Instant Knockout is safe. It is a supplement made with all natural ingredients.

However, Instant Knockout contains numerous stimulants, you should not combine it with products that contain caffeine or stimulants, such as tea or coffee, as this could result in an excessive caffeine intake.

Are There Any Side Effects?

Supplement Facts of Instant Knockout

There are minor side effects because the Instant Knockout is made of natural ingredients. The 300 mg of caffeine may cause jitteriness if you are caffeine-sensitive.

That’s roughly the same amount you get in 2 large coffees, which is common with fat-burning supplements and weight-loss supplements.

So, if you’re planning your daily intake of Instant Knockout, you may want to skip a few trips to Starbucks to lose weight.

For those dealing with side effects, check out the best stim-free fat burners or top natural weight loss supplements.

Weight Loss Ingredients And Their Effects

Let's look at how effective the ingredients in Instant Knockout are at stimulating energy levels, fat oxidation, weight loss, and appetite suppression.

1 - Caffeine Anhydrous

Caffeine Anhydrous on floor and on a container

While some athletes have trouble with caffeine anhydrous as a stimulant, you should note that there is extensive scientific evidence from The American Journal of Clinical Nutrition backing up the claim that it encourages your metabolic rate to burn fat and lose weight [1].

I was hesitant to take this product at first because of the caffeine level, but I lost around 1 to 2 lbs just within my first week of taking Instant Knockout.

2 - Green Tea Extract

Instant Knockout only contains a small amount of caffeine from its green tea extract, but I found a very interesting study that highlighted a direct link to body fat oxidation to lose weight [2].

3 - Cayenne Pepper Seeds

Cayenne pepper is a well-known thermogenic, but what I found more interesting was the company’s claim that it “boosts insulin sensitivity, helping improve the way you store carbs.”

You can lose weight in many ways with cayenne pepper, as it boosts fat oxidation, which helps your body burn fat more efficiently, according to the Oxford Journal Chemical Senses [3].

Also, having better insulin sensitivity resulted in easier and faster fat loss, which may have helped during my two cutting phases.

4 - L-Theanine

This amino acid is a common ingredient in many fat-burning dietary supplements like Instant Knockout. It is scientifically proven to improve memory and focus for longer and enhance sleep quality in healthy adults [4].

Since some fat-burning supplements contain stimulants like caffeine, which can cause jitters, taking it with L-theanine promotes relaxation to eliminate energy crashes. Combining caffeine and L-theanine may also improve focus during highly demanding tasks [5].

This may explain why I didn’t experience any energy crashes during and after workouts. I also noticed that I sleep better than usual, and I feel more rested to push through a challenging workout the following day.

5 - Glucomannan

Glucomannan close up image

The glucomannan in Instant Knockout helps suppress appetite by delivering a good amount of dietary fiber to make you feel fuller for longer [6].

True enough, I had better appetite control, which helped me cut out snacking in between, especially at night.

6 - Piperine

This ingredient is included in many fat burning products like Instant Knockout, and my dietitian goes as far as saying it is required to make absorption rates higher for both macro and micronutrients.

According to some studies, piperine has potential fat-reducing and lipid-lowering effects without any change in appetite, at a small dose of 40 mg/kg [7].

Piperine (from black pepper) can enhance the absorption or bioavailability of certain compounds, such as curcumin from turmeric.

7 - Vitamin B6

Vitamin B6 has been added to Instant Knockout due to a claimed link to the way cells repair and reproduce, which is an important factor in muscle building [8].

8 - Vitamin B12

Most people will link this vitamin to influencing your red blood cell count, but vitamin B12 also helps with fat oxidation and metabolism, according to Cureus Journal of Medicine [9].

9 - Vitamin D3

Known as the sunshine vitamin, vitamin D3 helps strengthen bones and muscles, improve cognitive function, and enhance heart health.

A recent study looked at how higher vitamin D levels are linked to better cardiorespiratory fitness, which may help you exercise harder and longer [10].

Our #1 Recommendation

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Instant Knockout Cut

When Should You Take Instant Knockout?

Man Taking Instant Knockout supplement product

You should take Instant Knockout a few times throughout the day, splitting your intake into 4 pills. It will provide maximum nutritional value.

Personally, I make it a habit to take one Instant Knockout capsule every meal, including my afternoon snack, because taking it with food may help increase absorption.

Because of the caffeine, you might want to avoid taking Instant Knockout too late in the day.

Instant Knockout’s Servings: 4x a Day vs 1x a Day

Instant Knockout is meant to be taken four times daily. This dosage is great for fat loss, as the multiple servings a day supply your body with a constant stream of nutrients that it can use to burn more fat.

This is a better way to take fat burning supplements than one serving a day because the effects tend to last longer, unlike one serving a day, where you only enjoy the benefits for a few hours.

Is it Suitable For Females?

Instant Knockout is suitable for females because it is not specifically a muscle-building product. For females, weight loss is often a higher priority than muscle gain.

One thing I would caution, though, is that the amount of caffeine in Instant Knockout is quite high when the full volume is taken each day. You may want to start with just 2 or 3 capsules a day.

Related Article: Best Fat Burners For Women

Up to 400 milligrams (mg) of caffeine a day appears to be safe for most healthy adults. That's roughly the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two "energy shot" drinks.

-Mayo Clinic

What Are People Saying About Instant Knockout?

To see what real-life users have to say about this product, we checked some Instant Knockout reviews posted on the official website:

“The results seen from Instant Knockout, while mixed with proper diet and training, are amazing. I’ve tried a few others, and none seemed to work as well as Instant Knockout.” - Nick, USA

“I used Instant Knockout for 8 weeks in order to try and shred the last bits of fat before the summer holidays. Within the first week, I noticed that I had much greater energy levels, and I was now reaching PBs in the gym. The appetite suppressing effects of Instant Knockout were able to stop me from snacking on chocolate bars and crisps in between meals.” - Joe, UK

“Before I started taking this product, I was 135 pounds. I took this product for only 2 months, and with a bit of dedication, I lost 15 pounds. I am so happy with the results, and I have more energy and feel better then ever.” - Karol-Ann, Canada

Where Is The Best Place To Buy Instant Knockout?

Close up Instant Knockout product

The best place to buy Instant Knockout is on the official website.

It is the only place where Instant Knockout is officially available, and with so many counterfeit products on the market, there are too many health risks you could expose yourself to. Worse, you might get the real product, only to find out that it already expired a year ago.

It is also the only way you can take advantage of the money-back guarantee and some reasonable bulk-order prices for Instant Knockout. It ensures you're constantly taking Instant Knockout and maximizing its health benefits.

Our #1 Recommendation

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Instant Knockout Cut

Shipping and Returns

Instant Knockout can be shipped to the US, Canada, Australia, UK, and most countries. But due to some restrictions, they do not ship to certain countries. You may check the complete list here.

If you buy 2 or more fat burning supplement bottles, they offer free shipping to US and UK customers.

But for Instant Knockout customers outside the US and UK, you can also get free shipping when you buy the 4-bottle package.

Other Fat Burner Alternatives

  • Helps suppress the appetite
  • Blocks the process of new body fat storage
  • Boosts thermogenesis for effective fat-burning
  • Improves energy levels
  • Enhances mental clarity, focus, and physical stamina
  • A bit expensive compared to other fat burners
  • Only available on the company website
  • Contains natural, fat-burning ingredients
  • Aids faster weight and fat loss
  • Suppresses appetite, reduces cravings
  • Boosts metabolism and thermogenesis
  • Enhances energy and mental focus
  • Appetite suppression could be more potent
  • Only purchasable through the official website
  • Speeds up metabolism day and night
  • Increases energy levels
  • Promotes restful sleep
  • Works as an appetite suppressant
  • Improves mental focus and alertness
  • Need to remember to take one capsule in the day and two capsules at night
  • More expensive than other fat burners

Other popular fat burners:

Long-Term Effectiveness of Instant Knockout

Instant Knockout stands out for its long-term effectiveness . Unlike many fat burners that only offer short-lived results, Instant Knockout supports sustained weight management based on our personal test results.

Its carefully selected ingredients not only aid in initial fat loss but also help in maintaining these results over time. Moreover, it minimizes potential long-term side effects, making it a reliable choice for those seeking a lasting solution to their fitness goals.

Testing Experience Beyond Weight Loss

Instant Knockout goes beyond mere weight loss and energy enhancement. Our testers reported positive changes in mood, improved sleep patterns, and an overall sense of well-being.

This holistic impact on health, stemming from its natural ingredients, underscores Instant Knockout's value as not just a fat burner but a comprehensive wellness supplement. Its multifaceted benefits make it an excellent choice for those seeking a healthier lifestyle along with their fitness journey.


instant knockout faq banner

Should You Take Instant Knockout With Food?

Yes, you should take Instant Knockout with food. This is generally a good approach for all supplements like a fat burner to reduce the chance of an upset stomach and make the product more effective.

Is Instant Knockout Supplement a Thermogenic?

Yes, Instant Knockout supplement is thermogenic. It contains green tea extract, cayenne pepper, and green coffee bean extract, known for their thermogenic effects that may help you lose weight.

Can I Stack Instant Knockout With Other Supplements?

Yes, you can stack Instant Knockout as a fat burner with other supplements. However, because the recommended serving of Instant Knockout has about 300 mg of caffeine from the green tea extract, you have to be mindful of the caffeine content of the products you plan to stack it with.

How Long Does It Take For Instant Knockout To Work?

It takes 30 to 60 days to assess whether or not Instant Knockout works for you. It varies as some users lose weight in just a few weeks while others take a month or longer.

Is Instant Knockout FDA-Approved?

Instant Knockout is not FDA-approved. However, it is regulated by the FDA.

How Much Caffeine Is in Instant Knockout?

There is 75mg of caffeine per capsule in Instant Knockout. It sums up to 300mg of caffeine per daily serving.

Our Verdict on Instant Knockout

I can confirm from my first-hand experience that Instant Knockout is definitely worth the investment. After three months of trying the product out for this Instant Knockout review, analyzing the content with a nutrition expert, and reading through hundreds of reviews, I have to say that this fat burner is my personal favorite and the one I recommend to my clients.

If you're looking to achieve your weight loss goals and improve your body composition, Instant Knockout can be a valuable addition to your routine.

The weight loss effect is noticeable, and I have tried it during 2 cutting phases, where each time I reached my goals a few days early.

Our #1 Recommendation

Instant Knockout

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Rated With Total Shape's Scoring System

  • Strong dosage of caffeine for mental performance
  • Boosts testosterone production
  • Nice dose of glucomannan
  • Includes cayenne pepper which helps with fat burning and weight loss
  • Get the BEST PRICE until the end of May
  • You’ll need a reminder to take 4 pills per day
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About The Author

Benedict Ang, CPT, PN1-NC
Staff Writer & Senior Coach
Benedict Ang, CPT, PN1-NC is an ex-National Soccer player turned MMA and Kickboxing champion, with ACE CPT and PN1-NC certifications. His advice is rooted in education and experience, ensuring that readers receive scientific and battle-tested insights. His mission is to empower his clients and readers to realize their potential and become the best versions of themselves.
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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12 thoughts on “Instant Knockout Cut Fat Burner Review
Read This Before You Buy

  1. Thanks to this instant knockout review, I’m now leaner and stronger! Gotta say that this fat burner is legit!

  2. I have shed over 30 pounds using this product and with the right gym sessions and regime, I was able to gain so me muscles too. This one is legit. I highly recommend it. I experienced a little bit of a reaction during the first few days, I could not sleep! But eventually my body adjusted to it and I felt great. It gave me more energy and I felt the burn everytime I do my routine. My friend who’s into fitness even commended me because I work too hard and give it my all when I am in the gym! All because of this product. I love that it does it what it’s supposed to do and more

  3. It has been a while since I last visited your post. By the way, thanks for your awesome breakdown of this wonderful product. I have been using it for a little while now since I saw it in your website. What I have noticed while using this product is that with the high caffeine dosage, I can’t drink a cup of coffee in the morning and take this at the same time without stomach issues. I received an advice from my friend a couple of days ago saying he can help me out with my stomach issues. I look forward to reading more from you. Thanks in advance!

  4. Just wanted to say that thank you as always for your in-depth analysis of this amazing product. Since postage, I have been using this product for about 2 months now. Within that span of time, I went from 250 to 210 pounds! It was a great milestone for me because usually it takes me longer to lose so much. To give a background of what I have been doing, I rarely worked out or went to the gym. I just ate healthier, all the fruits and vegetables and less of those junk. I walked 4 miles every other day, and just was sensible about everything I did or ate. I believe it works great for losing stubborn belly fat as my friends have noticed a great loss in my abdomen area and in other smaller noticeable areas of my body. Which is kind of great since it has been a long time that I wanted to get rid of those. Furthermore, most notably though and focused in the stomach. I used to have a very big belly and it protruded out significantly. I don’t really drink heavily though that’s why it makes me wonder why I had it. However, I do notice while on it during my weight loss journey that it did sometimes cause minor weight gain by at most 2 pounds. But really, if you’re at least casually active, you should be able to work that off easily enough. I would recommend if you are a bigger person who may not be as big as I am or was would notice any significant reduction. It will probably take more time if you are already a leaner or fit individual according to my friends who are way, way lighter than me. At my current weight of 210 pounds, it has been harder and extremely slow to lose any more of my weight but I am trying hard to continue to lose the weight and slim down. After all, it has worked for me and I have proven it myself. So let’s keep ourselves posted guys. Once again, thanks!

  5. I’m a 26 year old woman and I’ve been using this magical product for about 6 months now. I found this product online but was a little sketchy at first. This pushed me to purchase it doubt-free. When I started using it, I was at around 63kg. Now as of writing this, I am bouncing around 53kg. I couldn’t be more happier than this that I can maintain almost near my ideal weight. To top it off, I lost that much with minimal exercise and limited diet. I guess any pills will work best especially coupled with a healthy diet. I live on a tiny island nation with little to no access to healthy food so for me, maintaining to eat a healthy diet really needed a significant input of an effort which has been worthwhile so far. I started seeing definite changes to my form in the second month. Initially I did suffer from sleeping problems due to caffeine sensitivity. Normally, I don’t drink coffee even when I have to keep myself awake during midnight. However, 6 months later, it’s not so much of an issue now. My biggest sticking point is 4 times a day can be hard to remember sometimes. This is definitely not a joke. As far as I can remember, I probably have wasted my first month because I’d forget to take it later in the day… But overall, I’m happy with the results. I have more energy during the day, and losing those unwanted curves has motivated me to keep on doing strenuous physical activities.

  6. Total Shape has been my go-to when it comes to this topic. I started taking this pills not so long ago. I was going to the gym maybe 6 times a week before, but I was doing that before I started taking these pills. Definitely, I saw an impact when I ate sweet stuff. I had no idea why. To begin with, I did not even like the taste of it. Because of that, I totally stopped eating it. Also, for some reason, I always felt full. I noticed that my body fat percentage went from 23% to 19% over a 2 month period. Occasionally, I stop using this product because of limited stocks. Since then, I stopped taking them and noticed that my appetite has gone up a bit. But I do feel more controlled when it comes to eating sweet stuff. Would definitely take these again as a quick fix for a holiday body as they give energy during exercise and stop my uncontrollable cravings!

  7. I ordered this product a little hesitantly, after trying various products previously which all promised fantastic results immediately but rarely work, and instead saw myself gaining weight which I really hated. I found the price was not overly excessive, especially for a month’s supply. I was definitely sold on your thoughts as you have always been honest with what you say. Initially not expecting much, I started on day one with my morning pill just before breakfast. Within ten minutes I felt full without taking a bite. This was rather strange. Naturally, I was a little surprised as I did not expect the appetite suppression to take effect so quickly. I continued throughout the course, sticking strictly to my diet and consuming the four pills daily. I have since started the same plan again to really pin down the difference on and off this wonderful product. All in all I would highly recommend this product to anyone struggling to stick to a plan. As much as discipline is important, a well-engineered product makes a world of a difference. I am glad I listened to this author.

  8. I’ve only been on it for a few days, but it truly works wonders in the appetite suppressant section, and it gives me a lot of energy. I did develop sleeplessness as a result of it, but so far, I’d say it’s one of the best fat burners. I’ve tried a lot of different things, and I can confidently tell that this is providing me with what I require.

  9. I decided to try this product after trying several other products that failed my expectations. And after tons of research, I took the leap after I came upon this website. I am a new reader of Total Shape but I have never read anything like this before. So I bought it immediately. Boy am I glad I did! I will admit the first couple of days I was on such a high, it was hard to sleep. I eventually got used to it and continued with my weight training. I eat pretty well so I really didn’t change my diet. I had increased energy, stopped eating out of boredom and felt so much stronger at the gym. I was on fire! Even after the first 2 weeks on this product, I saw results. I was in awe! If you are contemplating on trying it out I highly recommend it. Thank you for bringing out this product. You have really assisted me in reaching my goals.

  10. I’ve only been on it for a few days, but it truly works wonders in the appetite suppressant section, and it gives me a lot of energy. I did develop sleeplessness as a result of it, but so far, I’d say it’s one of the best fat burners. I’ve tried a lot of different things, and I can confidently tell that this is providing me with what I require. I Hope Instant Knockout will give me satisfying results in my weight loss journey.

  11. As someone who’s tried every diet under the sun and struggled to see results, it’s refreshing to see a product that’s catered specifically to the body’s natural fat-burning processes.

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