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Instant Knockout Fat Burner

By on February 22, 2018 in Weight Loss with 307 Comments

Instant Knockout Review

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Product: Instant Knockout
Manufacturer: Roar Ambition, Ltd.

OK, let me be blunt.

Over the years I’ve had the opportunity to sample, review, try-out, experiment-with, and put to the test many different types of supplements – and quite frankly, when it comes to weight loss products, the majority are (cover your ears, kids) complete bullshit.

This is the main reason I don’t recommend a lot of fat burners in general: so many brands I’ve had experience with over-promise and under-deliver – if they even deliver at all.

Instant Knockout ( is a relatively new fat burner to the market, and as usual, when I first heard about it my spider-sense started jumping like a yo-yo. “Here we go again,” I thought (although I had to admit that the bottle looked pretty cool).

If not for the fact that it’s made by Roar Ambition, Ltd. (makers of TestoFuel), I wouldn’t have given it a second thought. But considering the great track record that the other two products have, I must confess that I was curious about trying it out.

So, What is Instant Knockout?

According to the manufacturer, Instant Knockout was originally developed for pro boxers and MMA fighters. In case you’re not familiar, after a fight is scheduled it’s extremely important that the fighters lose enough excess weight – without compromising muscle and strength gains – to qualify at the official weigh-in.

These guys require a fast and effective way to drop the pounds, and using everyday methods just won’t cut it.


This product is apparently able to achieve this type of rapid result is due to a three-pronged approach: boosting the metabolism, improving endurance, and eliminating fat.

By combining a unique formula with carefully timed dosages throughout the day, your body should remain in a constant fat-burning state, while at the same time maintaining muscle and definition.

What’s in it?

There are 10 active ingredients in Instant Knockout, both  thermogenic and non-thermogenic, that are specifically combined to produce a synergistic effect together to turn off the body’s fat-storing switch.

Here’s a look at each one and how they interact with one another:

Green Tea: I’ve been a big fan of green tea’s benefits for a while now. Don’t be fooled, though – this natural ingredient may sound tame, but it contains the compound polyphenols which help pack a major punch when it comes to burning fat.

These polyphenols elevate norepinephrine levels to boost metabolism, cause the muscles and liver to increase fatty acid consumption, and reduces triglyceride levels which reduce overall fat in the body.

Cayenne Pepper: As I’ve discussed before, this hot pepper isn’t just something to spice up your meals any more,

it contains a component called capsaicin which increases calorie consumption, reduces fat stores, and has been shown to reduce the hunger hormone ghrelin.

Glucomannan: This naturally occurring yet powerful dietary fiber swells up in the stomach, making you feel fuller faster and preventing eating too frequently or too much. Based on the information I’ve read the effects are legit, and with the combined appetite-suppressing abilities of the cayenne, it’s made even more effective.

Caffeine Anhydrous: Who doesn’t know about caffeine – I mean, really? The thing about caffeine that makes it so popular in diet and workout supplements is that it’s been proven to boost metabolism and to quickly use up fat stores for energy, burning up to 30% more fat, in fact, if consumed before exercise.

It also stabilizes blood sugar levels for longer, which is another great way to control appetite.

And since it’s in an anhydrous form, you’re getting caffeine in it’s most potent state. Not having any impurities attached eliminates many of the unpleasant side effects associated with other forms of caffeine consumption, like drinking too much coffee, for example.

There is also a synergistic action between caffeine and the catechins in green tea, which can boost the body’s use of calories as energy.

Piperine: The capsaicin found in cayenne isn’t the only fat-burning compound found in peppers. This interesting ingredient (extracted from black pepper) has been shown to actually block the formation of new fat cells as well as improve the absorption of many nutrients, which technically makes the ingredients in Instant Knockout that much more potent.

Green Coffee Bean: Due to it’s increasing popularity, you’ve probably heard about green coffee bean extract. Numerous studies have shown that the chlorogenic acid contained in raw coffee beans reduces glucose production in the liver, prevents the fat absorption rate when digesting food, reduces body fat percentage, maintains healthy blood sugar levels and lowers cholesterol – all of which contribute to having a healthy, lean physique.

Vitamin B6 and B12: While the benefits of taking these B-vitamins are great for the health in too many ways to mention, I’m not sure that including them in the formula does much here. If you’re already taking a good multi-vitamin (which you should be), then the extra amounts you’ll be getting here aren’t going to improve on that much, although it certainly can’t hurt to take extra.

GTF Chromium: As far as this ingredient goes, I know that it’s good for stabilizing blood sugar levels, which in turn is helpful for fat loss. It’s also purported to increase growth hormone in the body, but the jury’s still out on that one.

Zinc: Zinc is one mineral that all guys should get plenty of, it’s necessary for maintaining optimal testosterone levels and the efficient processing of nutrients. As a matter of fact, research has shown that people that are overweight also have low zinc levels.

And the from the label:

Side Effects

First of all, the ingredients used in Instant Knockout (as with all Roar Ambition products) are top-notch, being made and regulated in both US and UK facilities.

This product is definitely safe to take on a regular basis – however, even though it primarily functions by targeting appetite suppression and fat storage, it does contain natural stimulants. Keeping this in mind, you should definitely time it so that your last dose for the day is 4-5 hours before bed time.

As a matter of fact, even though IKO contains less stimulants than a lot of other products, taking four capsules a day may be a little strong for those who aren’t coffee drinkers or are otherwise sensitive to caffeine. If that’s the case for you, you could try starting with just three a day initially.

This will not only prevent any kind of “speedy” side-effects, but it’ll also save money by stretching out the number of doses for each bottle. After you’ve accustomed yourself to that dosage, try going to the recommended four a day.

And while we’re on the subject, other than using common sense when taking Instant Knockout with other products that contains stimulants, I see no reason why there should be any issues with using other supplements.

And if you’re concerned about taking a drug test while using this supplement, don’t be – it doesn’t contain any banned or synthetic substances, and won’t trigger any false positives.

Manufacturer Video

How do you take it?

Each bottle of Instant Knockout contains 120 capsules at 500 mg each, designed to be taken four times daily – one capsule in the morning, one at lunchtime, one later in the afternoon, and one more before dinner. The purpose here is to keep the body in a constant and steady state of boosted metabolic rate.

Once again, if you’re sensitive to caffeine, try skipping the last dose initially and just try taking only the morning, noon and afternoon capsules.

Where to Buy

Currently, Instant Knockout is only available directly through the manufacturer’s website. It’s definitely a little on the expensive side, but once you try it you’ll realize what a quality product it actually is. Besides, it’s better than wasting half that amount for something that doesn’t even work.

I do know that they have distribution centers located in the US and UK, but they’ll also ship to anywhere in the world, so international shipping is not a problem (they also ship to APO addresses for those in the military). The orders get filled fast, too – barring weekends, they ship out either the same day you order or the next, with tracking.

The saving grace is the 90-day money-back guarantee – if you don’t see results in three months after trying Instant Knockout they’ll refund 100% of your payment. Trust me, this is not something most weight-loss products have the balls to do – they’d go out of business in a hurry if they did.

Conclusion – Does it Really Work?

My verdict? I’m not sure if it’s due to the quality, purity or combination of ingredients (or all three), but I love how well this product works.

For me it produced noticeable results by boosting the metabolic rate, reducing hunger cravings and fueling energy levels in a way that’s hard to describe but easy to feel. It’s also a very “clean” fat-burner compared to others – kind of like the difference between having natural energy versus too much coffee.

One thing I’m getting asked about all the time is “how long until I see results?” It’s really impossible to give a broad-brushed answer to that because everyone is different and there are so many variables involved.

One thing I can tell you is that if you think you’ll be able to sit on the couch watching TV while losing weight, you’re probably going to be disappointed. But if you take IKO with even a moderate increase in physical activity you should see results within 2 or 3 weeks, in my experience.

And even though it was specifically designed to be used by bodybuilders and athletes, I would say that any guy who’s looking to lose weight and reduce body fat would definitely benefit from this product, although I would encourage you to put the extra energy you’ll get to good use with some form of exercise!

You can find price and more info at the Instant Knockout website.

Overall Rating

Visit Instant Knockout Website

Have you tried Instant Knockout? I’d love to hear about your own personal experiences. Feel free to email me or leave a review or comment below.

About the Author

About the Author: Mark McIntyre is the founder of and acts as it's chief contributor. He is a fitness trainer and avid mountain biker who also enjoys camping, hiking and fishing. Besides managing Male Health Review, Mark is also a guest columnist for several blogs related to men's health. More about this author...

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  1. Cat says:

    Hi, I’m a 34 yrs female, 153 cm and 47.5 kg. Did a body scan at the gym last week and my fat is 25%. I am trying to build lean mass and bring my fat down to below 20% in order for my abs to show. I am aiming for 500 calories deficit of 1260 calories per day, with 40% of carbs, 40% protein and 20% of fat. I workout every day with a mixture of strength training, cardio and yoga. Have been on Knockout for a week and it doesn’t seem to help to suppress my hunger or gives me extra energy from what i read in most reviews. Hope it works for me as I bought the 4 months supply.

  2. gdssed11 says:

    Hello! Thabks

  3. vishal verma says:

    hi mate I m 73 kgs and having around 14% fat on my body i achieved that feat in 4 months as i was before 90kgs brfore but i want to get the six pack will that product help me as I already order this product and hit the gym 6 days a week and also tell me something about diet i only take one time that is only lunch dinner lite milk with banana or kellogs..I have a very hectic schedule.

  4. dev says:

    Hey, m dev (22) M, my weight is 112kg.. m trying to loose my weight thatswhy i workout daily but i want to losse my weight faster.. i m thinking to consume IKO pills bt afraid about the side effects…
    What would happen if i stop taking pills aftr loosing weight..??
    N what will b the side effects ??:

  5. Rishab Agarwal says:

    My height-178 cm
    weight=112 kgs
    For how many days/months should i consume it(IKO) to reach 80 kgs??
    And what should i eat throughout the day??

    How long should i workout?
    please help me out. I seriously want to loose my fat quickly.

    • Nitin says:

      Hi Rishabh, I would not advise you to take fat burner in first place, as you are too overweight, first you take calorie deficit diet, and workout at least an hour in gym, go for Cardio, and weight lifting plan, and increase your protein in diet, once you loose at least 10 kg in initially, in first 4-5 months later you can decide whether to take fat burner. i was 105 kg and without any supplement i came up to 90 now, following simple diet and workout plan, in my opinion fat burner is for the fat where you are in shape and want to avoid that extra fat on your body. cheers!

  6. Kevin says:

    Hi, I’m 21 and I’ve been on-and-off with my fitness for a few years now (been hovering around the same weight of 145-150). I’m looking to build muscle but only have access to a gym while I’m at school (college life and college budget).

    Long story short, say I stop taking this because I see results. Will there be a backfire or rebound? Because I’m scared that any fat I burn if I choose to buy this will immediately come back once I stop. I don’t have too much fat on my body as is, just looking to tone up a bit. Do you think just buying a single 1-month supply will give me the results I want without forcing me to keep buying?

    • It’s possible, but odds are likely that you’ll have to continue doing something to keep the extra weight off, whether that’s continuing with IKO or something similar, cutting back calories, or working out. In most cases, your body will sooner or later return to baseline and you’ll end up right back where you started.

      • Kate says:

        Can these interfere with birth control pills? I am currently taking Microgestin Fe 1/20 and i wanted to know if it could interfere with the hormones.

  7. Jacob Vinther says:

    Hi. Do “Six for Men” and IKO go well together? Thanks.

  8. Madhvi says:

    I dnt have any fat on my body but due to constipation I am gaining weight and my stomach is getting bigger. Can I take these pills?

  9. Jyana says:

    I just bought two bottles of this products. I also just gave birth 3 months ago. How many pills should I be taking and how soon will I start seeing results?

    • If you’re nursing, I’d be cautious about using certain supplements, including IKO. Otherwise, you should be OK with just following the directions as given. You’ll probably notice results before you finish your first bottle.

  10. Deep says:

    Hi My Name is Deep,my age 23, my weight is 90 kg, height 5’11”, I am want to lose 16 kg weight and fatt, tell me the perfect diet and cardio time and (IKO)pills taking time

  11. Kayleb says:

    So for a first time user of fat burners, how many bottles should I order?

  12. Kushal says:

    is it ok if i take only fat burner (no other supplement like whey protein etc.)

    • Sure, but it depends on what your goals are. If you’re aiming to just lose weight, then just taking something like IKO by itself should be fine. But if you’re also wanting to build muscle or do some type of strength training at the same time, then you should probably consider taking additional supplements (like protein powder, creatine, BCAA’s, etc.).

      • Matthew says:

        Hello name is Matthew …. I have a sensitive stomach does this product make you feel ,bloated or does it bloat you ??

  13. Rachel says:

    Hi. Loved your article and review on the Instant Knockout pills but i have a question. I am a 49 year old female in good health and lost around 5 stone going back 5 or 6 years ago but I am just starting to head into the menopause and have found that I am gaining weight around my tummy, hips and butt even though i eat mostly healthy and hit the gym on average 4 times a week. Would these be good to try and shift this stubborn fat and help me get back to my target weight? Thanks

    • It’s certainly OK for women to use this product, and many do with good results, so you probably should give it a try. I also recommend reducing caloric intake at the same time to really boost your results.

  14. Rohit Mishra says:

    Hi MARC,
    Can I take IKO capsules by removing the capsules and mixing the powder in water or RAW ???
    I am not comfortable having a capsule 3 times a day

  15. wes younts says:

    I do crossfit 5 to 6 days a week and then lift at lunch for an hr or so 3 days a week. I had been losing weight but after losing about 25 pounds I have plateaued on my weight loss for the last month. I currently weigh 232 and about 22% body fat and consume about 2200-2400 cal a day. I want to get down to 200. I take protein, Alpha Amino performance aminos. I just started lifting during lunch everyday so want to start taking creatine to help with recovery. I just bought my first bottle of Knockout ,and was wondering if taking Aminos and creatine will be ok with knockout?- thanks

    • Taking aminos and creatine with IKO is perfectly OK, in fact I recommend it. That’s a heckuva workout schedule, by the way. Congrats on your weight loss so far and keep up the good work!

  16. Rich says:

    I do a lot of weight lifting, usually about 5-6 days a week bike or walk to the gym (4.5 Niles to and 4.5 miles home) I use god of rage and war demonz would this be safe to take with it? Also what kind of results can I expect with this given the information I’ve given?

  17. Stelios says:

    For how long i have to take IKO fat burner to get results?im going to the gym 6 times a week.. Also can i use it at the same time with Testofuel?

    • Yes, you can use it with Testofuel and most other testosterone boosters. Results vary, naturally, but if you’re going to be hitting the gym six times a week, I’d imagine it won’t take long.

  18. Jim says:

    Hello, question regarding the guarantee. Says 90 days, each bottle is 30 day supply so I have to purchase 3 bottles?
    Will I then be refunded for 3 bottles?
    Thanks in advance.

    • To my knowledge, it’s 90 days, regardless of order quantity. So even if you just order a one month supply you should still have 90 day window for return.

  19. Trung Dinh says:

    Hi, nice article. You should probably add as a possible side effect is that glucomannan can actually cause an underactive thyroid, also called hypothyroidism which is kind of counter-intuitive
    to weight loss. Scientific evidence has shown that glucomannan can help calm a hyperactive thyroid so someone with normal or close to underactive thyroid using glucomannan may result to hypothyroidism. Do you know if there’s a similar product but doesn’t include glucomannan?

    • I know that there are studies showing glucomannan may help with treating an overactive thyroid, but I’m not aware of any adverse effects occurring in those who already have healthy thyroid function.

      A somewhat similar supplement that you might look at instead would be Thermakor. It shares some of the same ingredients, but has no glucomannan.

  20. Willie Lo says:

    I’m just finishing my first “handful” of Instant Knockout. My goal has been to lose more than 25 lbs. I’m 1/2 way there after 6 weeks! I have been a terrible food binger after 9pm, i attack the kitchen, sadly, but these pills have def helped curb that desire. Other “burner” pills i have tried, I wont name them, have actually given me a very upset belly, plus i feel “on fire” internally later in the day. NOT GOOD! but these pills, man, nothing like that! i fully recommend them and am going to their site now for my next batch

  21. Apps says:

    Hello, Am an athlete(long distance runner) from India.I have a stubborn fat in my abdomen and hip. I would like to know whether it helps? Also the dosage for women? Is it available in India ?Please help.

  22. Joey says:

    I’m an athlete currently training in the offseason trying to put on muscle while also reducing body fat. I lift 4 days a week an cardio twice a week at this point. Will taking this pill reduce the amount of muscle growth? I don’t want to hinder my muscle development.

    • No, IKO doesn’t adversely affect gains in muscle mass. It’s designed to boost the metabolism and help the body burn more calories on it’s own, but not in any way that would be detrimental to muscle growth.

  23. Vanne Young says:

    Just a word of caution: I have used instant knockout for a few months now. A recent routine blood test revealed a new thyroid condition. I have had perfect thyroid function always until this recent test, which showed underactive thyroid. My Doctor researched the ingredients in Instant Knockout and found medical literature that discussed the affect of konjac root (the source of gluconannan) on the thyroid. She believes that this ingredient caused my thyroid to shut down. We will test this theory by stopping the supplement and retesting the thyroid after a few weeks of corrective treatment.

  24. Stephanie stephens says:

    I would like to take IKO with a CLA supplement, wich one would you recommend?

  25. john bussa says:

    hello how lond do you take it for an how many cycles should you do. an also how much is one bottle?

  26. Teresa Jones says:

    Hi Mark, I’ve been taking IKO for a week along with 1,800 mlg Garcinia Cambogia and 800 mlg Green Tea extract each day. I’ve also been catefully maintains a healthy diet plan for over half a year and using using a excersize trampoline daily for cardio. I am going for a goal of losing 25 lbs and keeping it off so Is this combination a safe one?

    • I’d say that’s a great combination, and a safe one. Seems like you’ve done your homework, and you’re taking the right steps. Keep up the good work and good luck!

  27. Ali Rubaie says:

    Hi there, if I was to use Instant Knockout during my cutting phase and I lost the weight I wanted and achieved my goal. Do you think it would be suitable if I then continued to take it during my bulking phase? Or if u took it constantly would I be addicted to it due to the caffeine??

    • It’s highly unlikely that you’ll get addicted, but the product will lose effectiveness if not cycled on and off. Taking IKO during the bulking phase would also be counter-productive I would think, so it’s probably best all-around to just take it during the cutting phase.

  28. sam says:

    How soon does one see results with 3 capsules a day?

    • It depends on your tolerance level. If you’re somewhat sensitive to the ingredients it should be fine (and you can always work up to 4 capsules if needed), but I’m not sure that 3 will be enough for most people. The only way to know for sure it to try it, though.

  29. Richard says:

    Hi from Puerto Rico,How can i use the instantly knockout . is 4 times a day after meal or before meal.

  30. Skye Hissey says:

    I started using IKO based on the reviews and product info. On it now a week. No problem. How soon should I expect to see any result ? Thanks

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