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Welcome to my Instant Knockout review, where I’ll be diving deep into all aspects of this popular fat burner. 

When you look around at many fat burner supplements, most of them are highlighted by pretty intense claims. 

For example, they might say that you’ll lose 20 pounds in a few weeks, scorch off your belly fat, or drop so many inches from your waist. 

But as a holistic health practitioner and researcher, I’m always on the lookout to see if these products actually work. And perhaps more importantly, if they’re safe and legal to use. 

There have been many Instant Knockout reviews out there that seem to showcase it as a powerful fat burner. Is it true?

Keep reading my full Instant Knockout review to learn all about it and if it’s safe, effective, and worth trying out for yourself. 

Snapshot Rating

  • Ingredient Quality: 4 out of 5
  • Dosage Strength: Moderate
  • Brand Reputation: 4.25 out of 5
  • Price: Expensive
Instant Knockout Fat Burner

Instant Knockout is advertised as a potent weight loss supplement to help athletes and everyday folk get ripped and lean in a hurry. 

  • High dose of caffeine
  • Ingredients for energy and focus
  • May improve metabolism
  • May reduce appetite
  • Ingredients are well-researched
  • Made in a cGMP-certified facility
  • Expensive
  • Have to take four pills (one pill, 4x per day)
  • Some key ingredients are underdosed (e.g. cayenne, green tea extract)
  • Not good for stimulant-sensitive
We are reader funded, which means we earn a small commission if you make a purchase, at no additional cost to you. We appreciate the support!

About Roar Ambition

The Instant Knockout supplement is made by Roar Ambition, a well-known and respected fitness company. 

Roar Ambition claims to use only all-natural ingredients, and manufactures all of its supplements in cGMP-certified facilities in the US and UK. 

They claim they are dedicated to using the latest research and evidence to create effective, high-end fitness supplements. 

Whether you’re an average gym-goer, bodybuilder, or elite athlete, Roar Ambition designs products for you. 

Some other well-known supplements created by Roar Ambition are Hunter Focus, Prime Male, and Hourglass Fit. 

What is Instant Knockout?

Instant Knockout is advertised as a potent weight loss supplement to help athletes get ripped and lean in a hurry. 

One of the unique things about Instant Knockout is that it’s backed and used by professional boxers and fighters. And now the potent formula is available for everyone to benefit from, not just pro athletes.

The formula features a combo of powerful fat-burning “heavyweight” ingredients, such as green tea extract, cayenne pepper, and glucomannan. 

Ultimately, Instant Knockout fat burner is advertised to help you reach your fat-burning goals and get shredded like never before. 

Is Instant Knockout safe?

instant knockout reviews

Whenever there is a fat burner marketed as “hardcore” or “potent” you may wonder if it’s actually safe. 

After all, there have been some fat-burning ingredients over the years that eventually got banned due to safety concerns, such as ephedrine. 

Fortunately, Instant Knockout appears to be safe. It doesn’t have any banned ingredients and mainly includes vitamins, minerals, caffeine, and herbal compounds generally demonstrated to be safe to consume.

Things to Consider Before Buying Instant Knockout

Beyond the safety aspects mentioned above, there are some other things to consider before buying Instant Knockout. 


The Instant Knockout weight loss formula includes a pretty high dose of stimulants. This includes 300mg of caffeine, 500mg of green tea extract, and high doses of vitamins B6 and B12. 

So, it definitely seems like it’s geared more toward people who want a stimulant-based fat burner for extra energy. 

If you’re sensitive to stimulants, you may want to look for a different product or perhaps modify the dosage. 


If you’re a vegan or vegetarian, you can still safely consume Instant Knockout since all of the ingredients are vegan-friendly. 


Instant Knockout is pretty expensive. The regular price is over two dollars per serving, but there are a few ways to save by buying in bulk. 

Some options also come with nutrition e-books and exercise programming. This could be a bonus for someone who needs help with those areas too, especially beginners.

Instant Knockout Features

In this part of the Instant Knockout fat burner review, I’m going to go over some of the main features that make Instant Knockout stand out. 

Safe Ingredients

You may be concerned about consuming harmful ingredients when taking a fat burner

After all, some ingredients in the past have caused some serious side effects, such as ephedrine and synephrine

However, Instant Knockout claims to only use natural, research-backed fat burners that are safe for more people to consume. 

Appetite Suppressants

Part of the reason you may struggle with losing weight is that you give in to cravings. And when you eat those high-calorie foods, it makes it much harder to burn more calories than you take in, which makes fat loss very hard. 

Fortunately, the Instant Knockout supplement formula includes a few ingredients designed to suppress your appetite, such as glucomannan. 

In turn, this may help you eat less and put your body in a caloric deficit, which is necessary for fat loss. 

Metabolism Boosters

How efficiently you can burn calories and use food for energy is dependent on your metabolism. While your metabolism doesn’t really decrease all that much as you age, there are several factors that might make weight loss harder. 

Chief among these is not getting enough exercise. If you don’t work out enough, you lose muscle mass, and this slows the metabolism.

It’s a common problem. You’re focused on your career, where you sit down all day. You’re busy tending to your kids and not yourself. Before you know it, you’ve gained weight in areas you never did before.

As you make the effort to turn things around, metabolism-boosting ingredients can help.

Instant Knockout contains ingredients such as cayenne extract and green tea extract designed to speed up your metabolism, even when you’re at rest. 

I’ll tell you more about these ingredients and the research behind them coming up.

Stimulants for Energy

instant knockout supplement features

If you’re low on energy, you’re not going to exercise at your full potential. On top of not burning as many calories, you may turn to high-calorie, sugary foods for an energy boost. 

This is why it’s so easy to turn to candy and soft drinks mid-afternoon; it’s when most of us experience a decrease in energy.

But Instant Knockout contains a few natural stimulants designed to increase your energy levels. With caffeine, green tea extract, and B vitamins, it may give you more energy to power through your workouts and the rest of your day. 

Not only that, but these stimulants may also help you burn more calories too, even while at rest. 

Made for Men and Women

A lot of supplement companies make big money marketing toward one gender or another. However, a truly safe, beneficial fat burner supplement will be good for all bodies, regardless of gender.

Fortunately, Instant Knockout is designed to meet the needs of both men and women. Whether you’re a man wanting to get ripped and shredded, a pro athlete, or a woman wanting to tighten up your curves, Instant Knockout may be for you.

Instant Knockout Fat Burner

Instant Knockout is advertised as a potent weight loss supplement to help athletes and everyday folk get ripped and lean in a hurry. 

We are reader funded, which means we earn a small commission if you make a purchase, at no additional cost to you. We appreciate the support!

Does Instant Knockout really work?

It seems likely that Instant Knockout should help you lose fat when combined with a healthy diet and exercise plan. 

However, individual results may vary. Plus, everyone responds differently to weight loss products. 

This depends on many things such as your age, gender, activity level, amount of weight you need to lose, and even genetic factors.

But after scanning the label, I can tell that most of the ingredients in Instant Knockout are well-researched and generally proven to support fat loss. 

When compared to other fat loss supplements, Instant Knockout seems to be one of the better ones. But to really find out, we need to look at the ingredients.

Instant Knockout Ingredients

Here are the main active ingredients in Instant Knockout: 

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

Note: When looking at Instant Knockout’s dosage for each ingredient, you will see either “mg” (milligrams), “mcg” (micrograms), or IU (international units). 

Caffeine Anhydrous (300mg)

Caffeine anhydrous is a popular form of this well-known stimulant. 

As a stimulant, caffeine increases levels of certain brain chemicals such as norepinephrine, which may stimulate the breakdown of fat. Caffeine may boost your metabolism, too. 

Overall, caffeine supplementation seems beneficial for losing weight and body fat. 

Effective dosage according to Examine: 200mg

Green Tea Extract (500mg)

Instant Knockout also includes green tea extract, which is another stimulant. 

Green tea extract contains compounds called catechins that seem to be able to increase fat burning and metabolism, especially one compound called EGCG. But not all studies show benefits.

Effective dosage based on research: 400 to 500mg EGCG, which is typically from 800 to 1,000mg of green tea 50% extract.  

Cayenne Powder (100mg)

instant knockout supplement ingredients

Cayenne powder comes from the cayenne pepper plant. It is rich in a compound called capsaicin, which has stimulating effects. 

Cayenne and capsaicin may suppress appetite and enhance the body’s ability to burn calories in a process called thermogenesis. 

While it isn’t a magic pill, current research does show that it has some positive effects for weight loss.

Effective dosage according to Bioscience Reports: 6mg of capsaicin (which typically comes from 2,500mg cayenne).

L-Theanine (100mg)

L-theanine is an amino acid found in green tea leaves. It is known for its calming, stress-reducing properties. 

Plus, taking theanine alongside caffeine may increase energy, alertness, and cognitive function

Theanine may also decrease the potential side effects of caffeine, such as sleep disruption and jitters.

Effective dosage according to research: 100 to 200mg

Glucomannan (1,800mg)

Glucomannan is a dietary soluble fiber found primarily in the roots of the konjac plant, also known as the elephant yam. 

It “sponges” up water and takes up space in the stomach and digestive tract. This may cause a feeling of fullness and a reduced appetite. 

And there is some evidence that glucomannan can mildly help weight loss in overweight or obese people. 

Effective dosage according to the Journal of the American College of Nutrition: 1,000 to 3,000mg, although this is not entirely definitive.

Black Pepper Extract (10mg)

instant knockout weight loss ingredients

Black pepper extract is most known for a compound in it called piperine, which can enhance the absorption of other ingredients. This may make the other ingredients more effective. 

Black pepper also has antioxidant, anti-inflammatory, and potentially metabolism-boosting properties. 

Effective dosage according to Examine: 20mg of piperine

Vitamin B6 (5mg)

Vitamin B6 is one of the eight B-complex vitamins. Vitamin B6 is involved in many functions, such as helping turn the food you eat into energy. 

It’s also necessary for optimal brain health and cognitive function. 

And while one study did find some benefits for weight loss, the overall evidence seems lacking. 

Vitamin B12 (10mcg)

Vitamin B12 is another one of the B-complex vitamins. Vitamin B12 is likely the most important B vitamin for brain health and energy levels. 

Also, there is some evidence that lower vitamin B12 levels are associated with higher obesity and weight gain. 

But unless you’re deficient, vitamin B12 is unlikely to add any extra benefit. 

Effective dosage for people who are deficient: 1,000mcg

Vitamin D3 (45mcg/1800IU)

The last ingredient in Instant Knockout is vitamin D3, which is a form of vitamin D. 

This is a fat-soluble vitamin that is important for many functions, such as bone, immune, and mental health. 

Like vitamin B12, low levels of vitamin D are related to a higher incidence of obesity and weight gain. 

But supplementing with vitamin D doesn’t seem to have any major benefits for weight loss, although it can help overweight people achieve more optimal levels of vitamin D.

Effective dosage for raising blood levels of vitamin D (but not for weight loss): 1,000 to 2,000 IU

Instant Knockout Pros and Cons

instant knockout fat burner pros and cons

Thanks for sticking with my Instant Knockout review so far, because now I’m going to go over the major pros and cons. 


  • High dose of caffeine
  • Ingredients for energy and focus
  • May improve metabolism
  • May reduce appetite
  • Ingredients are well-researched
  • Made in a cGMP-certified facility


  • Expensive
  • Have to take four pills (one pill, 4x per day)
  • Some key ingredients are underdosed (e.g. cayenne, green tea extract)
  • Not good for stimulant-sensitive
Instant Knockout Fat Burner

Instant Knockout is advertised as a potent weight loss supplement to help athletes and everyday folk get ripped and lean in a hurry. 

We are reader funded, which means we earn a small commission if you make a purchase, at no additional cost to you. We appreciate the support!

How to Use Instant Knockout

Roar Ambition recommends that users take one capsule of Instant Knockout with a glass of water four times per day. 

You are instructed to take one capsule as soon as you wake up, another in between breakfast and lunch, the third one an hour after lunch, and the fourth one an hour before dinner. 

It isn’t recommended to take your last dose closer than five hours before going to bed.

Recommended Dosage

instant knockout dosage

The total daily recommended dosage is four capsules. Do not exceed the recommended dosage.

If you’re worried about the stimulants, some people have found success by taking just half of Instant Knockout’s dosage. 

Real Customer Instant Knockout Reviews

Let’s see if customers are getting those Instant Knockout results. 

There are a lot of positive Instant Knockout Cut reviews on their main website, with many people saying that they lost weight and had more energy. 

On their website, they also highlighted a few Instant Knockout before and after transformations, some of which showed a lot of weight loss. 

Here are some examples of some Instant knockout real reviews:

“After the first few days, I noticed that my appetite was suppressed but on top of this I had sustainable energy throughout the day. After a week I started noticing results. My “loose bits” soon started to shed and my frame began to look slimmer and leaner.” -Melissa 

The fat started to go, from the belly, legs, and all over. It was shocking because it is a natural product, no hormones, no “magic tricks”. After 3 months of it, I could see the results and the effectiveness was shocking.” – Rosy M. 

“Maybe worked (it’s hard to tell though when you’re dieting and exercising whilst taking). In terms of energy and feeling full, I preferred PhenQ.” -Brian C. 

“By far, this is the best fat burner out there compared to others and I have taken others and was seeing very minimal results. It might be pricey, but you’re definitely getting your money’s worth.” -Mario R.

“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 than ever.” -Karol-Ann

“Followed the instructions to the letter (4 pills a day, every 3 hours starting at wakeup and eating no less than an hour after ingestion), but I changed nothing about my diet (which is already pretty well rounded) to see what effect the pills alone would have… I gained/lost 0 lbs, so no change at all.” -Jay F. 

Instant Knockout Reviews Summary

instant knockout review

As you can see, there are a lot of positive reviews but some negative Instant Knockout reviews, too. 

On Amazon, 23% of Instant Knockout’s reviews are one-star, although 46% of Instant Knockout reviews are five-star. This confirms what we likely already know – results will vary.

Instant Knockout Fat Burner

Instant Knockout is advertised as a potent weight loss supplement to help athletes and everyday folk get ripped and lean in a hurry. 

We are reader funded, which means we earn a small commission if you make a purchase, at no additional cost to you. We appreciate the support!

Alternatives to Instant Knockout

Given that not all supplements work for everybody, here are some alternatives to Instant Knockout that may be worth looking into. These include Night Shred, Hunter Evolve, and PhenQ. 

Night Shred

Night Shred is a night-time fat burner and sleep aid supplement made by Inno Supps. It is designed to accelerate fat loss while you sleep. 


  • Ingredients for sleep support
  • May reduce stress and anxiety
  • May decrease appetite
  • Some well-researched fat loss ingredients


  • Pretty low dosages for fat-burning ingredients
  • Doesn’t have many fat loss ingredients overall

Hunter Burn

Hunter Burn is a fat-burning supplement made by Hunter Evolve. And it’s actually still made by the parent company, Roar Ambition. 


  • High dose of glucomannan
  • Ingredients for appetite suppression
  • May boost metabolism
  • May increase energy


  • Very expensive
  • Limited ingredient profile
  • Some ingredients aren’t well-researched


Another option is PhenQ, which is advertised as a natural weight loss formula that targets multiple pathways.


  • A few well-researched, trademarked ingredients
  • Effective dose of caffeine
  • May enhance metabolism and thermogenesis
  • Includes some ingredients to suppress appetite


  • Many ingredients are dosed too low
  • Contains artificial colors
  • Uses a proprietary blend 

Read our in-depth PhenQ Review.

Health Benefits of Instant Knockout

Here are the main benefits that you might get from an Instant Knockout supplement:

  • Weight Loss
  • Increased Energy
  • Boosted Metabolism
  • Reduced Fat Storage
  • Appetite Suppression

Weight Loss

instant knockout fat burner review

Instant Knockout has a wide variety of ingredients that may help you lose weight through different mechanisms. 

With its combination of appetite suppressants, metabolism boosters, and stimulants, Instant Knockout may help you achieve a healthier weight. 

This may even make you healthier overall, since being overweight is a risk factor for many diseases. 

Increased Energy

With a high dose of caffeine and decent doses of green tea extract and B vitamins, it is possible that Instant Knockout will increase your energy levels.  

And with more energy, you may be able to crush your workouts and burn more calories, while simply just feeling better overall. After all, who doesn’t want more energy?

Boosted Metabolism

You may also get a boost in metabolism from some ingredients in Instant Knockout, such as cayenne powder and green tea extract. 

This may help you burn more calories even while at rest, which could make your weight loss journey much less daunting. After all, everyone needs a little help from time to time. 

Reduced Fat Storage

instant knockout fat burner reviews

Glucomannan and other ingredients in Instant Knockout may also help your body to reduce fat storage and decrease fat accumulation. 

This is good not only for your physical appearance but for many other aspects of your health. Too much fat in the body can cause many problems and increase the risk for some diseases.

Appetite Suppression

Lastly, Instant Knockout may help decrease your appetite. While this isn’t a direct health benefit by itself, it may help you decrease the consumption of sugar, fatty, and high-calorie foods that aren’t good for you. 

Plus, having a lower appetite makes it easier to stay in a caloric deficit and reach your weight loss goals.

Potential Side Effects of Instant Knockout

A few of the potential Instant Knockout side effects are related to the high caffeine and stimulant content. These may cause anxiety, jitters, and sleep problems. 

Also, some ingredients such as cayenne powder and glucomannan may produce digestive symptoms, such as upset stomach, bloating, or nausea. 

Lastly, some people may experience headaches or dizziness, although these aren’t too common.

Instant Knockout Price

You can either buy a one, two, or four-month supply.

Their one-month supply (120 capsules/30 servings) costs $65 ($2.17/serving). 

You can also buy their Cutting Stack, which is a two-month supply (240 capsules/60 servings) for a price of $130 ($2.17/serving). The price per serving is the same here, but you also get their Boss Shred program for free. 

Boss Shred is a workout and nutrition program to further help you get ripped and lean.

Lastly, you can buy their Ultimate Cutting Stack, which is a four-month supply (480 capsules/120 servings). 

You only pay for the price of three bottles and get one free, for a grand total of $195 ($1.63/serving). This option also comes with the free Boss Shred program. 

Instant Knockout Shipping & Returns

Instant Knockout ships worldwide, although they exclude some countries.

Orders placed in the US, UK, Canada, and mainland Europe generally take anywhere from one to 10 days to be delivered. Orders outside of these areas typically take five to 15 days for delivery. 

Also, your shipping costs will be calculated at checkout. 

They do offer free shipping in the US and UK if you buy two or more bottles, and they offer free worldwide shipping if you buy four bottles at a time.

Instant Knockout Company Details

As a reminder, Instant Knockout is made by the parent company, Roar Ambition. 

You can find more information at either website: or 

Contact them with any comments, questions, or concerns at this email: [email protected]

Instant Knockout Fat Burner

Instant Knockout is advertised as a potent weight loss supplement to help athletes and everyday folk get ripped and lean in a hurry. 

We are reader funded, which means we earn a small commission if you make a purchase, at no additional cost to you. We appreciate the support!

Final Recommendations

Well, you’ve reached the end of my Instant Knockout fat burner review. 

And now the real question is…are you ready to take action? 

Perhaps you’ve already started on your fat-burning journey. And that’s great. But if you’re here, you’re probably looking for some extra help. 

Maybe you’re struggling with losing those last few pounds off your waist and other areas. 

A lot of us get frustrated and annoyed with that extra fat that’s preventing us from looking (and feeling) our best. Instant Knockout may be just the solution you need to reach your goals. 

No, it isn’t a magic pill. But it does have solid doses of well-researched ingredients that may help boost your metabolism, increase your energy, suppress your appetite, and ultimately help you take off those pounds.

That’s why it’s definitely one of the better options to use alongside your fat loss regimen. 

If you want to take the next step beyond just diet and exercise for fat loss, check out Instant Knockout at their main website here

If you try it, leave me a comment to let me know what you think.

Frequently Asked Questions

Does Instant Knockout work?

Instant Knockout may work, but results aren’t guaranteed for everybody. With that being said, it contains some key ingredients proven to help with weight loss and body fat reduction. 

How fast does Instant Knockout work?

Results may vary from person to person. The quickest effects will likely be for energy since the caffeine and other ingredients work right away. 

But for fat loss, you may start to see the effects after one to two weeks. It depends on many individual factors.

Is Instant Knockout FDA-approved?

No. The FDA doesn’t regulate dietary supplements.

What do you stack with Instant Knockout?

Instant Knockout can potentially be stacked with a pump pre-workout if you want to take it as a pre-workout. But you shouldn’t stack Instant Knockout with any other stimulants because there is already a high dose of stimulants in this product.

Can I take Instant Knockout while fasting?

Yes, most people can take Instant Knockout while fasting. Make sure to talk with your doctor if you have any concerns or are dealing with any medical problems.

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