instant knockout review
Instant Knockout is a long-standing, and popular fat burner on the fitness market right now. It is created by Roar Ambition and contains an interesting selection of ingredients. 

Although it might be popular, I decided to take a deeper look into this fat burning supplement and it’s formula.

What Is Instant Knockout?

Instant Knockout was originally designed to help professional MMA fighters drop their last few pounds before weighing in for a fight.

instant knockout bottle

It was developed by a UK company called Roar Ambition and was recently rebranded to Instant Knockout Cut.

The ingredient listing also changed during this update to the supplement. L-theanine and Vitamin D3 were added while zinc, green coffee bean extract, and chromium were removed. 

Thankfully, the Red40 food dye used in the old pills was also removed.

Does Instant Knockout Help To Burn Fat?

It contains a formula that is intended to deliver powerful ingredients at higher serving sizes. By examining the ingredients (more on that later..) the Instant Knockout formula is advertised as helping with fat-burning and weight loss in the following ways:

  • Boosts metabolism
  • Reduces cravings
  • Provides energy & focus

This particular formula has been designed by the company with the intention of helping its users to achieve that all-important calorie deficit.

instant knockout box

By increasing your metabolism it can provide more wiggle room when it comes to burning more energy (and therefore fat) than you consume. On top of that, by reducing cravings and cutting down portion sizes, you’ll find it easier to stick to a calorie-restricted diet and get ripped.

As the formula was created to suit athletes, it also offers a good portion of caffeine to help fuel workouts. This is designed to keep you energized to maintain an active lifestyle and support a calorie deficit.

How Does Instant Knockout Work?

As I  mentioned above, Instant Knockout is designed to help you create a calorie deficit.

It does this through the three mechanisms I outlined in the last section, but let’s take a closer look at how the formula within this supplement can make this happen.

The metabolic support comes in the form of thermogenic ingredients like caffeine, green tea and cayenne pepper. These work by increasing your body temperature slightly, which causes you to burn more calories throughout the day. When this is combined with any training or exercise, the calories consumed increase even more.

instant knockout beforeinstant knockout after

Instant Knockout complements this by providing an appetite suppressant helping you to avoid snacking between meals. This is intended to contribute towards a lower calorie intake and to provide you with an extra layer of support while on your diet.

Finally, this formula contains caffeine anhydrous, which stimulates the brain and body and should help you stay focused and energized when on a low calorie diet.

This combination should help to support you in your weight loss efforts.

Instant Knockout – The Ingredients

Before I get into the full ingredient profile, let’s take a look at what this supplement can offer on a top-level basis:

  • Completely natural – meaning a better absorption rate and your body should react well
  • No filler ingredients – each part of the formula has some use for weight loss
  • Reasonable stimulant level – doesn’t use extreme dosages so not jittery
  • Strong servings – dosages are potent and aligned with research


Serving Size: 4 Capsules – 30 Servings per Container Amount Per Serving % Daily Amount
Vitamin B6 (as pyridoxine HCI) 5mg 250
Vitamin B12 (as cyanocobalamin) 10mcg 166
Zinc (as zinc oxide) 10mg 150
GTF Chromium (as picolinate) 100mcg 82
Great Tea Extract (leaf) 500mg **
Green Coffee Extract (bean) 100mg **
Cayenne Powder (fruit) 100mg **
Glucomannan (konjac root) 1800mg **
Caffeine Anhydrous 300mg **
Black Pepper Extract (standardized to 95% PE) 10mg **


A glance at the supplement facts reveals that this is a well-considered and carefully formulated product. The company website backs up each ingredient choice with recent research, which is reassuring in terms of effectiveness.

The list of ingredients may not be the longest, but this works in favor of dosages. Overall, we’re happy with the serving sizes in this supplement as, compared to other similar products, it offers competitive performance.

Now let’s take a look at the most important parts of this formula.

Green Tea Extract

This is a well-known ingredient within the fat burner industry. The catechins and caffeine within this extract have been proven to help raise metabolic rate and increase overall calorie burn (1).

green tea

In fact, it has been linked to weight loss in a number of studies.

Due to its caffeine content, it can also help to energize you. Research shows the stimulant can help to improve physical performance in a workout too by reducing muscle fatigue and improving your ability to repair and recover.

Green Coffee Extract

The usual coffee beans we’re used to seeing are the brown, roasted version. Before they’re roasted, they’re green and packed full of chlorogenic acid, which helps to slow the rate of fat absorption from food (2).

One long term review concluded that, by including green coffee beans into their diets, study participants experienced a reduction in body mass and belly fat. On top of this, it also contains some caffeine, which again adds to both the thermogenic and energizing value of the formula.

Cayenne Pepper Powder

The power of cayenne pepper is well known within fat burners. Although a widely-used spice, it also has a place in some of the most premium weight management products available.

When it comes to weight loss, cayenne pepper provides a metabolic boost through its thermogenic properties.Research shows that those who regularly supplement with the spice experienced a much higher calorie burn than those who didn’t use it (3).

It’s also been linked to higher fat oxidization, so your body is drawing on fat for fuel. In comparison to other similar supplements, Instant Knockout offers a very generous serving of cayenne pepper. It’s also paired with green tea and caffeine, to make a strong thermogenic trio.


Nature’s most highly-researched appetite suppressant is a good addition to any fat-burning formula. This ingredient has been shown to swell slightly when it reaches the stomach, making you feel fuller, combating cravings and cutting down on portion sizes (4).

By taking it before your meals, you can make the most of the appetite suppression ability of glucomannan. Instant Knockout offers 1800mg, which is a generous amount compared to other similar weight loss supplements.

GTF Chromium

GTF Chromium or Glucose Tolerance Factor Chromium is a mineral that helps with the normalization of glucose levels in the blood as well as supporting cholesterol levels.

The chromodulin protein within this helps the body to metabolize and break down fat and carbohydrates using them as an energy source.

Caffeine Anhydrous

This is a widely consumed and well-known stimulant. Most of us take caffeine in coffee or tea to help us stay energized and focused.


In terms of fat burning it’s also a thermogenic ingredient, which may be able to help you to burn more calories (5).

What’s more, as a stimulant it has also been shown to help with physical performance, boosting power and endurance in particular.

At 300mg distributed throughout the day, Instant Knockout is on the upper limit of safe caffeine servings. It shouldn’t give you any side effects, but you should monitor your overall stimulant intake whenever you take it.

Other Ingredients

On top of these main ingredients, Instant Knockout contains vitamins B6 and B12, zinc, chromium and black pepper extract. These are all served well and should help to support metabolic processes, nutrition, overall health and the other ingredients in this formula.

Overall, the formula should help you to support your goals in the following ways:

  • Increase your metabolic rate
  • Suppress appetite
  • Provides energy required to stay active on a low-calorie diet
  • Improve metabolic processes
  • Offers additional key micronutrients

I think this formula is a good one and offers a range of support for any diet.

Instant Knockout Price

A single bottle of Instant Knockout provides 120 capsules, which gives you a month’s supply/30 days’ worth of supplementation.

  • One bottle costs: $59
  • Two bottles + free US and UK shipping: $118
  • Three bottles + one free bottle + free US and UK shipping: $185

The larger bundles are often a popular option due to saving money in the long run and can with the value for money. This could be a good choice for you if you’re planning on long-term weight loss.

Do You Need A Fat Burner?

A fat burner is a dietary supplement made up of ingredients that have been linked in some way to weight loss. They’re not a regulated supplement, and therefore there is no guarantee or proof they will do all of the work for you when it comes to fat loss.

They’re often made up of natural food and plant extracts, along with vitamins and minerals, that should be backed by research that links these ingredients to weight management.

A fat burner shouldn’t be considered a shortcut or a magic pill for fat loss, instead, they are meant to support you in creating a calorie deficit through an energy-restricted diet and exercise.

While you don’t necessarily need a fat burner, as the calorie deficit is the key to weight loss, they offer an extra pillar of support that many find useful.

Frequently Asked Questions

How to take Instant Knockout?

Instant Knockout is designed to be taken in four capsules spread throughout the day. You should take one when you wake before breakfast, one before lunch, one mid-afternoon and one before your evening meal.

This should allow the appetite suppressant to start working before you sit down to eat. Try to avoid taking Instant Knockout within five hours of going to bed as the stimulant could affect your ability to sleep.

Do You Take Instant Knockout With Food?

No, you take Instant Knockout (and most other fat burners) first thing in the morning and between meals.

Is Instant Knockout A Thermogenic?

Yes, it contains both cayenne pepper and caffeine. Both of which are proven to increase body temperature and burn calories.

Are there Instant Knockout side effects?

Instant Knockout offers a reasonable amount of caffeine, so you shouldn’t experience side effects from this formula. If you are particularly sensitive to the effects of caffeine, I suggest you aim to cut down on your coffee, tea and energy drink intake throughout the day.

This should help to keep you safe from adverse symptoms. Other than that, I believe this is a low-risk supplement.

Is Instant Knockout FDA Approved?

Yes, Instant Knockout is FDA approved and manufactured following cGMP standards.

What if I don’t like Instant Knockout?

The largest bundle of Instant Knockout comes with a 90-day money-back guarantee, so if you don’t see the results you’re looking for after taking the supplement consistently alongside exercise and a restricted-calorie diet, then you can get your money back. This takes away some of the risk if you are considering purchasing this supplement.

Final Thoughts

Combined with a restricted-calorie diet and exercise, a fat burner can be a great way to support the weight loss process. I believe Instant Knockout is an excellent choice if you’re looking for a fat burner that aids with metabolism, cravings and energy levels.

The formula is very strong, consisting of well-researched, high-quality ingredients that stand up well under scrutiny. If taken as directed, this supplement really could help you to lose weight and I feel happy to recommend it.