Isaac Robertson
Published by Isaac Robertson
Fact checked by Donald Christman, BHSc FACT CHECKED
Last updated: April 18, 2021

As a fitness instructor, I work with a lot of high-performance athletes on a daily basis. It’s usually a mix of bodybuilders and just average people who need some help with weight loss, health, and fitness goals.

But I’ve also started working with MMA fighters, 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 pills out there.

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

What Makes Instant Knockout Unique?

instant knockout fat burning product

If you’ve followed any health and fitness pages on Facebook or you just happen to read posts about body and muscle building, then you’ll quickly notice a load of suspicious fat burners filling your news feed and search results.

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

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

MMA is one sport where they take supplements more serious than any other.

The company behind the product is Roar Ambition, and their goal was to make the most effective fat burner and identify natural ingredients with a scientifically proven ability to help athletes get rid of fat and build more muscle.


But it would have to work for professional athletes at the top of their game, as well as average people who just want to bulk up a bit or achieve some weight loss goals.

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. Every one of the natural ingredients has scientific studies backing up their benefits.

While that may seem like a simple thing to do, the devil is always in the details, so I spent some time going through online Instant Knockout reviews to see what kind of effects people were reporting.


What Are The Benefits Of Instant Knockout?

Instant Knockout Benefits

I wanted to focus this Instant Knockout review on its nutritional label. The brand claims to have an all natural list of ingredients that could potentially help you with weight loss without the unnecessary side effects.

I'll discuss those ingredients and what they do in detail, but let's talk about what the product claims first.

1. Fat Loss

This might be an obvious benefit of fat burners, but it really can be hit and miss with these types of supplements. However, the product has combined a few ingredients that not only help with fat burning but also helps to reduce the process that stores the flabby stuff in the first place.

2. Increased Energy Levels

When your body burns more fat, then 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.

This means that it may help with workouts by staying motivated, but also at work and college when you need your brain to work on complex problems. Fat burning may become more effective you sustain your energy levels during workout.

  • Strong dosage of caffeine from green tea extract for mental performance and thermogenic effects for weight loss
  • 10 mg of zinc boosts testosterone production for more muscle growth
  • Nice dose of glucomannan to help as an appetite suppressant
  • Includes cayenne pepper which helps as a fat burner to shed off more calories
  • You’ll need a reminder to take 4 pills per day

OK, with all these pros and cons, we can say that Instant Knockout promises good stuff.  What about some negatives?

Are There Any Side Effects?

Side Effects - Instant Knockout Review

Fat burners and weight loss pills have had quite a bad reputation. Sure, a lot of them may be effective at weight loss, but many can also cause upset stomach, which isn’t ideal to stay motivated on a weight loss program.

The good news is that because it is made of the most natural ingredients my dietitian has encountered, side effects really are limited.

The one area where you may want to be careful with Instant Knockout is the dose of caffeine, especially for women. With a full dosage containing 300 mg of caffeine, or the same as 2 large coffees, you can experience jitters and sleepless nights if taken too late in the day.

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.

Weight Loss Ingredients And Their Effects

Now that you have a good picture of the product's benefits and side effects, let’s take a closer look at how effective the ingredients in Instant Knockout are at stimulating energy levels, fat oxidation, fat burning, and stalling your appetite.

1 - Caffeine Anhydrous

caffeine anhydrous2

According to my dietitian, caffeine anhydrous is one of the most closely studied thermogenic ingredients.

This is probably why Roar Ambition decided to make it a major feature on Instant Knockout's ingredients list.

While some athletes have trouble with caffeine anhydrous as a stimulant, you should note that there is very good scientific evidence [1] backing up the claim that it encourages your metabolic rate to burn fat. Its effect on losing weight has been studied by many researchers.

2 - Green Tea Extract

green tea extract2

I used to force myself to drink some green tea every day. It’s just not a taste I enjoy, but I totally understand the antioxidant benefits it provides.

But, when I found that you can get supplements that contain green tea extract, I jumped on the opportunity.

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

Again, thumbs up to the designers for doing their homework. Although I'm not a fan of the taste of green tea, having it as a supplement is completely fine by me.

3 - Cayenne Pepper Seeds

Cayenne Pepper Seeds2

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.”

Not surprisingly, at this stage of my research, I was able to find supporting studies of this [3].

Now, before you think that this means you’re in for some mouth burning experience, it only takes a small amount, and in pill form, the cayenne pepper goes straight to your stomach.

4 - Zinc


This metal influences a lot of processes in your body from immune health to stabilizing effects on your metabolism.

This is why it’s so popular in supplements.

But of most interest for anyone trying to build more defined muscle tissue is that zinc helps to increase testosterone levels [4].

I saw quite a few review comments where athletes actually had some hormone level tests done before and after taking Instant Knockout and similar products with zinc.

In all cases, there was a positive impact on T-count.

5 - Green Coffee Bean

green coffee bean with chlorogenic acid

Apart from containing a useful amount of green tea extract, Instant Knockout also has green coffee bean.

Many people think that coffee extract is just going to be useful for delivering caffeine, but that’s actually something that it doesn’t deliver much of.

The benefit of this ingredient comes from the fact that a lot of nutrition is lost during the coffee roasting process.

I found one very interesting study that showed that green coffee helps to burn fat and improve heart health [5]. It also contains a good amount of chlorogenic acid which acts as an antioxidant. Indeed, Roar Ambition did their research well.

6 - Glucomannan


This product contains glucomannan extract, which was new to me. I found out that it’s sourced from the konjac root.

Unlike most of the other ingredients, this is not included based on an ability to burn fat in an effective way.

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

Appetite suppressant ingredient is something many other supplements miss, in that reduced food intake results in your body sending some craving signals that you need to deal with.

7 - Chromium


This is not a mineral I was overly familiar with, and I hadn’t seen it before in supplements except in this one. Instant Knockout contains GTF chromium as picolinate, which acts as a protein that boosts insulin action.

My dietitian pointed out that increasing number of clinical review and meta analysis are being conducted to fully identify its effects on body weight [6].

It is also linked to controlling appetite, and many of the reviews I read highlighted a lack of hunger as a great positive of Instant Knockout.

8 - Piperine

This is another one of the very versatile ingredients in Instant Knockout that has a lot of nutritional value.

It’s 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.

9 - Vitamin B6

Vitamin B6

We all know how important vitamins are, and your daily nutrition intake has to cover a very wide range of them.

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.

One study has proven a link, but it’s still a little bit inconclusive [7].

Just check if your multivitamin also contains B6, as you may want to avoid taking too much.

10 - Vitamin B12

The second one of the included in the Instant Knockout ingredients list is vitamins is B12, and Instant Knockout contains more than you need every day.

Most people will link this vitamin to influencing your red blood cell count, but vitamin B12 also helps with fat oxidation and metabolism [8].

When Should You Take Instant Knockout?

box of instant knockout

Every time I recommend supplements like fat burners, one of the first questions is always “what time of day should you take them?”

With a single dose product, timing becomes very important, but Instant Knockout is designed to provide maximum nutrition value throughout the day by splitting your intake into 4 pills.

This spreads out the fat burning effects and delivers a more constant stream of extra energy. One thing I noted in a few reviews about Instant Knockout and other was that athletes suggested setting a reminder on your phone or get into the habit of taking a capsule every time you eat a meal.

Some also mentioned that because of the caffeine from green tea extract, you might have to avoid taking it too late in the day.

Is it Suitable For Women?

For women, weight loss is often a higher priority than muscle gain. The good news is that Instant Knockout is not specifically a muscle building product. This means that women can take full advantage of effective fat burning properties to improve their health, fitness, and energy.

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, but that has the advantage of making the bottle last longer.

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

Where Is The Best Place To Purchase Instant Knockout?

I always recommend buying directly from the Instant Knockout's official website. It is the only place that 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 very good bulk-order prices when you buy 3 bottles (get 1 free) in one go. Since I ordered my first supply, I now always go for the “Ultimate Shredding Stack” from the official website to save money.

If the fat burner doesn't work for you or simply want to try a month supply,  you can always take advantage of their 90 day money back guarantee.

Be aware that you may find it for sale on other retailers, and I highly recommend to get it from the official website to be on the safe side.

 Other popular fat burners:


instant knockout faq banner

Do You Take Instant Knockout With Food?

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

Is Instant Knockout a Thermogenic?

Yes, Instant Knockout is a thermogenic, which means it increases your core body temperature slightly by boosting your metabolic rate, thus resulting to possible weight loss. This can also help provide more energy for workouts and ultimately helps in losing weight. It contains green tea, cayenne (from black pepper), and green coffee bean which are known for their thermogenic effects that may help you lose weight.

How Do You Take Instant Knockout?

Use Instant Knockout by taking 1 pill 4 times per day with meals and snacks. Because it’s in pill form, it’s easy to adjust your intake up or down as required to achieve your weight loss goals. I recommend taking Instant Knockout and couple with a healthy diet and exercise for best results.

Does Instant Knockout Fat Burner Work?

Yes, Instant Knockout fat burner does work, and you can see this in all the positive product reviews online. Of all the fat burning supplements available right now, this is the one that has the most scientific research backing up its powerful effects.

Can I Stack Instant Knockout With Other Supplements?

Yes, you can stack Instant Knockout 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.

Is Instant Knockout 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 reports from other users, I have to say that this is my personal favorite, and the one I recommend to my clients.

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

Not only is it one of the more effective supplements on the market, but it’s also very reasonably priced. You can purchase 3 bottles of the product and get a free bottle plus free shipping from their official website.

The pros and cons and discussion of ingredients are all laid out for your to make your informed choice.

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

Instant Knockout Box

Instant Knockout

Our #1 Recommendation

  • Strong dosage of caffeine for mental performance
  • Boosts testosterone production
  • Nice dose of glucomannan
  • Includes cayenne pepper which helps with fat burning and shedding off more calories
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