Total Shape is a reader-supported site. Purchases made through links may earn a commission. Learn more.

Instant Knockout Cut Review (2022's Unbiased Report)

Isaac Robertson
Published by Isaac Robertson
Fact checked by Donald Christman, BHSc FACT CHECKED
Last updated: May 19, 2022

As a fitness instructor, I work with many high-performance athletes on a daily basis. 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 recently introduced me to Instant Knockout. While I'm a fan of fat burners, I'm also very cautious of all the dodgy weight loss supplements out there.

But because of the results I have witnessed, I decided to do some more research and look into the ingredients with a dietitian to put together this detailed Instant Knockout review.

What is Instant Knockout Cut?

Instant Knockout Box

Instant Knockout 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.

Our #1 Recommendation

Instant knockout


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 on a regular basis.

Instant Knockout was designed by Roar's ambition for professional athletes. 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.

After receiving positive feedback from professionals, the product was made available to the general public.

What Makes Instant Knockout Cut Unique?

The fact that it is designed to assist athletes and bodybuilders in losing weight while maintaining muscle mass makes Instant Knockout Cut unique.

The fat-burning industry is a huge business, and unfortunately, there are too many black sheep promising to help you lose weight quickly.

However, my suspicions about Instant Knockout were instantly reduced when I saw that there was a lot of backing from MMA fighters and coaches like Diego Sanchez and Greg Jackson.

We'll get to the details of Instant Knockout's nutritional label below, but I can say here that a lot of thought has gone into creating this product.

What Are The Benefits Of Instant Knockout Cut?

The benefits of Instant Knockout Cut are its effectiveness in weight loss without unnecessary side effects, provided by all-natural ingredients.

1. Fat Loss

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

After 3 months of using Instant Knockout, it's one of the products I would recommend to my clients trying to cut. It helped me reach my goal days early during my two cutting phases.

Most users online also noticed that they were losing fat as fast as 2 weeks, while others took a month or two to reach their desired weight.

2. Increased Energy Levels

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

But what I found in many different Instant Knockout reviews is 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 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

Is Instant Knockout Safe?

Instant Knockout is safe. It is a fat-burning 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 InstantKnockout

There are some minor side effects because it is made of natural ingredients. The 300 mg of caffeine on a full dosage 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 burners and weight loss supplements.

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

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

Our #1 Recommendation

Instant knockout


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 anhydrous2

According to my dietitian, caffeine anhydrous is one closely studied thermogenic ingredient.

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

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.

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 [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.”

One of the main benefits of having better insulin sensitivity is 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 dietary supplements. It is scientifically proven to improve memory and focus for longer and enhance sleep quality in healthy adults [4].

Since some 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 tough workout the following day.

5 - Glucomannan


Glucomannan helps to suppress appetite by delivering a good amount of dietary fiber to make you feel fuller for longer.

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

6 - Piperine

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

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 due to a claimed link to the way cells repair and reproduce, which is an important factor in muscle building [7].

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 [8].

9 - Vitamin D3

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

It may also lower blood pressure levels, but new research suggests that it may also give you the boost you need for workouts.

A recent study looked at how higher vitamin D levels are linked to better cardiorespiratory fitness, which may help you exercise harder and longer [9].

When Should You Take Instant Knockout Cut?

box of instant knockout

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

This spreads the fat-burning effects and delivers a more constant stream of extra energy.

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

Because of the caffeine from green tea extract, you might want to avoid taking it too late in the day.

Our #1 Recommendation

Instant knockout


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 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.

However, the downside is that it might be too much to remember for some. Taking four capsules a day of any supplement might take some getting used to, but aside from that, there's no real issue with it.

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.

This means that women can take full advantage of effective fat-burning properties for increased energy and weight loss.

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 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 Cut?

instant knockout fat burning product

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

It is the only place where it's officially available, and with so many counterfeit products on the market, there are too many health risks you could expose yourself to.

This is also the only way you can take advantage of the money-back guarantee, as well as some good bulk-order prices.

Other popular fat burners:

Instant Knockout Cut Cost

Each bottle has 120 capsules which would last for a month with a recommended daily dosage of 4 capsules.

You can either buy one-time at $59 or subscribe to get 10% off (you can pause or cancel anytime).

But you can also choose from the packages below to take advantage of bigger discounts:

  • 2 bottles ($118)
  • 4 bottles ($185)

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 bottles, they offer free shipping to US and UK customers.

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

Is Instant Knockout Safe for Everyone to Use?

Instant Knockout is safe for most people. It uses top-quality, 100% natural ingredients to support weight loss and is made to the highest possible standards in the USA.

Moreover, the product doesn't hide behind sketchy proprietary blends, so it's also an excellent option for people with dietary restrictions.

Some people might be wary of its caffeine content, but it’s not too much to make you feel restless. Just don’t take it close to bedtime.

Fat Burner Alternatives


PhenQ is one of the most popular fat burners in the market today that aims to burn stored fat and stop fat production by accelerating your metabolism through a trademarked formula called α-Lacys Reset®.

In a full daily dose, it contains half the caffeine you get from Instant Knockout, making it more suitable for those who are sensitive to stimulants. It’s also vegan-friendly like Instant Knockout, and it gets cheaper per bottle (as low as $38) when you buy a package.


Marketed as a female fat burner, LeanBean is one of the most effective vegan-friendly fat burners that does not contain any stimulants. It works to help burn excess fat and suppress appetite through a higher dose of glucomannan (3 g per day) and other all-natural ingredients like chromium, zinc, and turmeric.

Unlike Instant Knockout, which is designed for performance athletes, LeanBean has a caffeine-free formula that’s perfect for females who want to lose some unwanted fat. They also sell at the same price, so it all comes down to your fitness goals.

Related Article: Instant Knockout Vs Phenq


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 a Thermogenic?

Yes, Instant Knockout 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, 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, which works against adulterated or misbranded dietary supplements.

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.

Because this supplement contains a high quantity of stimulants, some people may want to limit their caffeine intake from other sources while using it.

Due to a high caffeine concentration, we don't recommend using this supplement too close to bedtime.

Caffeine and other ingredients like it can have negative side effects in some people, which is why you should always seek medical advice before starting any new product.

Is Instant Knockout Cut Worth The Investment?

Yes, Instant Knockout Cut definitely is worth the investment. After 3 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.

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.

Once you have tried it out for a few weeks, make sure you get in touch with us on social media or use the contact page on this site.

Our #1 Recommendation

Instant Knockout Cut

Instant Knockout Box
Ingredient quality
Overall Score 5.0
  • 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

Was this article helpful?

About The Author

You May Also Like

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!

    1. That’s what I’m talking about! Good luck on your fitness journey, Kurt!

  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. Hey Isaac. 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 Isaac!

  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 until Isaac wrote down his thoughts on it. 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. Isaac 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! Thanks Isaac.

  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 Sir Robertson 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 Isaac 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 Isaac 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.

Write a Reply or Comment

Your email address will not be published.