instant knock out fat burner review

Instant Knockout Fat Burner Review – A Straight KO?

In it’s pretty fist-shaped tub, Instant Knockout has been gathering a speedy following on social media.

instant knockout fat burner review

But is it any good?

After all, most fat burning supplements offer little more than hype…

So today we’ll find out, in my official Instant Knockout Fat Burner review!

I’ll be putting this product up against my constantly harsh supplement rating system, taking you through both the good points and the bad points, and determining whether it’s a product you should spend your cash on as you build your best body.

As always, today’s review is completely unbiased!

Because as with most products which create a social media buzz, it’s easy to get lost in poorly constructed “5 star reviews” and social media images which are nothing more than sales pitches.

If Instant Knockout is great, I’ll tell you it’s great.

If it’s absolutely awful, I’ll tell you to avoid it like the plague.

Deal? Let’s begin!

Instant Knockout fat burner review

Instant Knockout Fat Burner Review – The Good

This product is beautiful to look at.

Not since Grenade hit the market with Thermo Detonator back in 2008 has a fat burner looked so awesome.

It also contains a whopping 300mg caffeine, which allows Instant Knockout to double up as a pre workout if necessary.

But that’s where the good news ends, I’m afraid.

This is another case of social media hype being used to scale a product which is simply not good enough to be considered a top supplement in it’s genre…

Instant Knockout fat burner honest review

Instant Knockout Fat Burner Review – The Bad

Where do I begin?

Back in 2018, regular website visitors will remember me reviewing a pre workout which had undergone the same social media rise to fame as Instant Knockout.

That product was 4 Gauge, encased in beautiful red shotgun shells and covered in slogans about being “the most powerful pre workout ever developed!”

I was eager to put it to the test, but it took a savage beating in my review, because once we got past the hype and the packaging, 4 Gauge was nothing more than a sub-par pre workout.

instant knockout fat burner

Instant Knockout is developed by the same company – Roar Ambition.

And yes, sadly it goes down the exact same route!

There are so many bogus weight loss claims on the website that I could have a field day here without even looking at the product’s formula, so I’ll run through those in the next section, and we’ll focus first on the actual ingredients inside Instant Knockout fat burner.

As mentioned above, caffeine is the powerhouse in this product.

With 300mg per serving, you will definitely feel an energy boost from this. But the actual fat burning effects of caffeine are notoriously small.

In fact, once you have adapted to it, not only will you lose the slight fat burning effects but it’s unlikely you’ll ever experience them again.

The rest of Instant Knockout’s supposed “fat burning” formula consists of the usual suspects – green tea extract, green coffee extract, chromium, cayenne powder, and vitamin B.

I could go through each ingredient here and show you why they won’t help you burn more fat, but the bottom line here is that Instant Knockout is delivering a KO punch in terms of packaging and nothing more.

(Of course, as with all of my supplement reviews, I will go through each ingredient further down the page as I break down the entire formula.)

instant knockout fat burner uk

Instant Knockout – Great White Hype

Remember when Rocky Balboa teamed with Apollo Creed to defeat the menacing Clubber Lang in Rocky III?

How awesome was that?!

Rocky’s tenacity, coupled with Apollo’s confidence and ability to drum up a scene, led to the downfall of the seemingly unbeatable Mr. T, and the rest is history.

Likewise, Don King helped build Mike Tyson into the absolute tank he was throughout the 1980’s.

Many guys lost the fight during the press conference, such was their fear of the supposedly unstoppable Iron Mike.

And it worked.

Having a so-called “hype guy” can be an invaluable asset to helping a boxer reach the top of the rankings.

But the underlying issue with both of those situations is that the boxers themselves were undeniably talented.

If you’ve ever watched a Rocky movie, you’ll know that there is no way in hell he was going to give up. Especially after he’d gone through an epic training montage featuring grueling beach sprints and uncomfortably cut-off tank tops.

And there’s no denying Mike Tyson’s brute force in the squared circle. Many consider him the best of all time.

What am I getting at here?

Well, Roar Ambition have hyped Instant Knockout to the moon and back on their sales pages, but the product simply cannot deliver.

This has led to some startlingly incorrect claims, which I’m going to run through here.

instant knockout fat burner uk
  • Spot Reduction

This is a myth long used in the fat burner segment of the supplement market.

According to their website, Instant Knockout gives you “the power the erase your most stubborn fat.”

Not just your fat.

Your most stubborn fat.

“Belly, man boobs, thighs, hips, it doesn’t matter.”

That’s not how fat burning works. Your body will burn fat from wherever it wants, and you can’t choose where from.

They should know better

But, sadly, that’s the tip of the iceberg!

instant knockout fat burner review
  • Don’t Do Your Own Research!

I’ll say this only once – any company advising you not to do your own research is hiding something!

If Instant Knockout really does contain the 10 most powerful natural fat burning ingredients as it claims, Roar Ambition would happily tell you to head on over to and admire the stack of research demonstrating their claims in action.

But they do the opposite.

Apparently, they have done their research so you don’t have to.

But, as you’ll see below, that research leaves a lot to be desired.

Instant Knock Out fat burner review
  • The Metabolism Myth

“It’s not that you can’t lose weight, it’s your metabolism…”

The battle of “fast metabolism vs slow metabolism” (and their influence on overall fat loss) has raged on for decades, with many supplements claiming that speeding up the metabolism is basically the key to unlocking a mythical holy grail of fat loss results.

Research does not support this theory.

As well-documented by Kamal Patel here, around 96% of people stay within 200-300 calories of the average metabolism, and resting metabolic rate is not well correlated with weight gain. (1, 2)

The page goes on to claim that “as you cut calories and exercise, your body actually slows your metabolism!”

Yes, it does – but contrary to the scary claim above, this is a perfectly normal response to somebody getting leaner.

They go on to hint that you have put your body into “starvation mode” and will “store extra calories as body fat!”

Newsflash – starvation mode doesn’t exist.

There is no instance in the history of the world where somebody put themselves into a consistent calorie deficit and failed to lose weight. This is supplement industry bulls**t at it’s finest.

Calories are all that matters regarding weight loss. (3)

instant knockout fat burner
  • No Exercise Necessary!

It’s a smart business move to broaden the potential audience to include both men and women.

But in doing so, Roar Ambition seemingly cannot resist making another absolute howler in their claims of how effective their product is.

Adding a fat burner to a lifestyle which isn’t built around exercise and a healthy diet is like fighting Rambo with a Nerf gun.

Once again, this is complete nonsense.


Instant Knockout – Nutrition Breakdown

You’ve seen my rundown of the good and bad points of Instant Knockout above.

Now it’s time for me to run through all of the key ingredients in the product to give you a look at why they’re included, and whether the dose is significant enough to yield the results it claims.

Let’s begin with the main event:

  • 300mg Caffeine

This is a big serving of caffeine, and will result in a big energy kick for most people.

I say “most”, because caffeine is notoriously subjective. (4)

Caffeine is an effective performance booster, and has been shown to have a positive influence on everything from strength output to focus. I love it. But its reputation as a “fat burner” is greatly over-hyped. (5, 6, 7, 8, 9)

Any potential fat loss achieved via regular caffeine supplementation is more a direct result of the energy boost it creates, rather than the fat burning effect of the caffeine itself, and that energy boost depends wholly on a person being caffeine naive.

green tea extract fat burner
  • 500mg Green Tea Extract

Like caffeine, green tea extract is another regular ingredient in fat burning supplements.

But while green tea is packed with antioxidants (which are useful), research does not support the notion of green tea extract as a fat burner. (10, 11, 12)

In fact, any slight fat burning effects would require a huge dose, and even then they’d depend wholly on person being caffeine naive.

chromium fat burning benefits
  • 100mcg Chromium

Chromium is a mineral associated with regulating glucose metabolism and insulin.

It’s also been linked with appetite suppression.

One of my personal training clients suffered from a chromium deficiency, and found that supplementing with chromium did indeed have an impact on food cravings.

But the key word there is deficiency.

If you don’t have a deficiency, you have no need to supplement with chromium. Providing the body with more than it needs will not see an improvement in results.

However, if you did have a chromium deficiency you’d be looking to supplement with around 1000mcg per day, not the 100mcg provided in Instant Knockout. (13, 14, 15, 16)

instant knockout fat burner review
  • 100mg Green Coffee Bean Extract

Green coffee bean is an ingredient linked with heart health and fat loss.

It appears to have a slight effect on both.

And I mean slight

A meta-analysis of the available body of research surrounding green coffee bean extract was published in Gastroenterology Research and Practice in 2011, and researchers concluded that out of 5 human trials conducted so far, only 3 measured weight loss, only 1 was published, and that there was a high chance of bias. (17)

  • 1800mg Glucomannan

Glucomannan is a soluble fiber.

The inclusion of dietary fiber in a supplement is a great move, as most people get nowhere near enough on a daily basis.

Increasing the fiber in your diet can aid in appetite control, but as a weight loss ingredient it’s not going to make or break your results.

A 2014 meta-analysis published in the Journal of the American College Of Nutrition found that the evidence supporting glucomannan as a weight loss aid produces statistically insignificant differences in overall weight loss results and (like the meta-analysis on green coffee bean extract before it) suggests that the current studies leave a lot to be desired in terms of quality control. (18)

Instant Knockout fat burner review

Instant Knockout Fat Burner Review – The Final Verdict

Despite being one of the largest sectors of the supplement industry, the fat burner marketplace is one of the least scientifically-backed.

Pseudoscience and anecdotal evidence run amok, and prey on our desperation to shed those unwanted pounds from our midsections.

There is no pill which has figured out the formula to unlocking a rift in the space/time continuum and sucking out your body fat.

(Despite the claims!)

Roar Ambition’s Instant Knockout fat burner follows these trends, delivering many of the same old ingredients with shreds of evidence to underscore the huge fat loss claims made on the product.

Do you know why Instant Knockout can lead to weight loss when combined with a healthy diet and regular exercise?

Because the keys to weight loss are a healthy diet and exercise.

A bar of chocolate per day can lead to weight loss when combined with a healthy diet and regular exercise, but that doesn’t mean I’m going to start recommending you eat chocolate on the daily.

Instant Knockout will give you an energy boost due to it’s decent serving of caffeine.

If that’s worth £35 per month to you, go for it.

As such, it achieves two stars on my supplement rating system.

I hope you’ve enjoyed my Instant Knockout Fat Burner review! Jump on my email list below for future training tips, and proven supplement recommendations.

Check out this product here.

Instant Knockout Fat Burner Review


  1. Amatruda, J. M., et al. Total and resting energy expenditure in obese women reduced to ideal body weight. J Clin Invest. (1993)
  2. Weinsier, R. L., et al. Metabolic predictors of obesity. Contribution of resting energy expenditure, thermic effect of food, and fuel utilization to four-year weight gain of post-obese and never-obese women. J Clin Invest. (1995)
  3. Howell, S., et al. “Calories in, calories out” and macronutrient intake: the hope, hype, and science of calories. Am J Physiol Endocrinol Metab. (2017)
  4. Beaven, C. M., et al. Dose effect of caffeine on testosterone and cortisol responses to resistance exercise. Int J Sport Nutr Exerc Metab. (2008)
  5. Cook C., et al. Acute caffeine ingestion increases voluntarily chosen resistance training load following limited sleep. Int J Sport Nutr Exerc Metab. (2012)
  6. Del Coso J., et al. Dose response effects of a caffeine-containing energy drink on muscle performance: a repeated measures design. J Int Soc Sports Nutr. (2012)
  7. Mora-Rodríguez R., et al. Caffeine ingestion reverses the circadian rhythm effects on neuromuscular performance in highly resistance-trained men. PLoS One. (2012)
  8. Childs E., et al. Subjective, behavioral, and physiological effects of acute caffeine in light, nondependent caffeine users. Psychopharmacology (Berl). (2006)
  9. Kim T. W., et al. Caffeine increases sweating sensitivity via changes in sudomotor activity during physical loading. J Med Food. (2011)
  10. Hursel, R., et al. The effects of green tea on weight loss and weight maintenance: a meta-analysis. Int J Obes (Lond). (2009)
  11. Westerterp-Plantenga, M.S. Green tea catechins, caffeine and body-weight regulation. Physiol Behav. (2010)
  12. Diepvens, K., et al. Obesity and thermogenesis related to the consumption of caffeine, ephedrine, capsaicin, and green tea. Am J Physiol Regul Integr Comp Physiol. (2007)
  13. Pittler, M. H., et al. Chromium picolinate for reducing body weight: meta-analysis of randomized trials. Int J Obes Relat Metab Disord. (2003)
  14. Attenburrow, M. J., et al. Chromium treatment decreases the sensitivity of 5-HT2A receptors. Psychopharmacology (Berl). (2002)
  15. Docherty, J. P., et al. A double-blind, placebo-controlled, exploratory trial of chromium picolinate in atypical depression: effect on carbohydrate craving. J Psychiatr Pract. (2005)
  16. Anton, S. D., et al. Effects of chromium picolinate on food intake and satiety. Diabetes Technol Ther. (2008)
  17. Onakpoya, I., et al. The use of green coffee extract as a weight loss supplement: a systematic review and meta-analysis of randomised clinical trials. Gastroenterol Res Pract. (2011)
  18. Onakpoya, I., et al. The efficacy of glucomannan supplementation in overweight and obesity: a systematic review and meta-analysis of randomized clinical trials. J Am Coll Nutr. (2014)

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