Instant Knockout Reviews 2024: Is It Legit?

Rick Bayer

Reviewed by Kimberly Langdon, MD
instant knockout reviews

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instant knockout








  • Burns stubborn fat deposits
  • Appetite control
  • Faster metabolism
  • Thermogenic boost
  • Vegan friendly
  • Curbs hunger cravings
  • Boosts energy expenditure

Brand Information

  • UK-based company Roar Ambition 
  • GMP, FDA-approved facilities 
  • All natural ingredients
  • Popular Health Supplements

Medical Benefits

  • Potential fat burner
  • Suppresses appetite
  • Boosts energy levels
  • Helps maintain muscle mass
  • Elevates mood and brain activity

About The Brand

Instant Knockout is a fat burner that’s been formulated by a UK-based company called Roar Ambition since 2014. It’s a company that manufactures sports performance supplements. Their fat burner products are made of natural ingredients. 

They constantly update their fat burner formula to keep it updated.

Roar’s ambition created Instant Knockout for professional athletes. One of the first athletes to benefit from Instant Knockout was Diego Sanchez, UFC champion and MMA icon.  He’s a champion, UFC Hall of Famer, and multiple award winner in combat sports.

After positive results from athletes, the product was released to the public. 

Coming to the Instant Knockout,  it is made from natural extracts and is formulated to target weight loss. The Instant Knockout ingredients work as an appetite suppressant, curb food cravings, boost metabolic rate, thermogenic boost, and help in burning fat.  

Fat-burning ingredients in Instant Knockout such as green tea extract, green coffee bean extract, GTF chromium, caffeine anhydrous, cayenne pepper seeds extract, and black pepper extract along with vitamin b6, and vitamin B12. Instant Knockout is made in GMP and FDA-approved facilities.

But Instant Knockout is not FDA-approved. Using Instant Knockout along with diet and exercise can help you lose weight faster.

What Are Instant Knockout?

Instant Knockout in general has positive customer reviews, however, some customers report that it did not help in lose weight at all. Whereas, some say it had a tremendous effect on their body. On the other, there is nothing but a lot of positive reviews on their official website. 

Most of the complaints around Instant Knockout are about their return policy and most of it is about their misleading return policy. In addition to this, some complaints include sentiments about the cost of the product. Many customers find it expensive. 

And some also complain about bad customer service and return policy. After thorough research, we found several reports from the actual Instant Knockout users that they experienced a weight loss of almost 16lbs in 4 months.

Is Instant Knockout Legit Or A Scam?

Although, Instant Knockout is commonly used among athletes and professionals. It has a perfect weight loss formula for normal people who are trying to lose weight. Instant Knockout is a legit product with lots of natural ingredients and positive customer reviews. Instant Knockout has impressive and scientifically proven ingredients to help you lose weight.

Feature Product & Coupon

instant knockout

Instant Knockout

  • Made of all-natural ingredients
  • Ingredients are effective fat burners
  • Do not require calorie restriction
  • 90 days money-back guarantee
  • One must take four tablets daily
  • Sold only on their official website and stores.

Instant Knockout Ingredients

Instant Knockout is made of natural ingredients and is one of the popular fat burners out there.

It works by boosting metabolism with the thermogenic ingredients in it. This works by increasing the energy levels and its expenditure by spending the calories that come from food and the fat. Instant Knockout curbs food cravings and works as an appetite suppressant.

Furthermore, it contains energy stimulants that boost energy so that you won’t feel tired and can perform intense workouts despite restricting calories. Coming to Instant Knockout ingredients, Instant Knockout has a whopping 500mg of green tea extract. It helps in fat-burning by fat oxidation.

The compounds such as catechins and caffeine[1] work by fat oxidation and as appetite suppressants, increase metabolic rate to spend more energy. The next popular ingredient is cayenne pepper boosts fat metabolism by increasing the temperature and calories burned. 

Glucomannan is a dietary fiber[2] that can suppress appetite keep you full for longer and increase satiety. Other ingredients such as green coffee bean extracts, caffeine anhydrous, GTF chromium, B6 vitamin, and vitamin B12 will help in fat oxidation, and piperine[3] from black pepper will aid in fat burning and weight loss while maintaining muscle mass.

You can buy Instant Knockout only on the Instant Knockout website as they do not sell on any third-party sites. Their products are available only on the official Instant Knockout website to cut down the prices.

As mentioned earlier, Instant Knockout ingredients are known to target weight loss in various forms, read further to know how these ingredients work.

Instant Knockout Ingredients

Green Tea Extract

Green tea is one of the popular fat burners out there. The polyphenols antioxidants and caffeine in green tea burn stubborn body fat and this results in weight reduction. Green tea’s antioxidants such as catechins[4] inhibit the enzyme that suppresses the fat-burning hormone norepinephrine. This leads to more norepinephrine levels, which means more fat burn.

These compounds raise the levels of the hormones that will help fat cells break the fat down. This will release the fat into the bloodstream making it more available for energy. The caffeine and EGCG present in green tea also have synergistic effects[5].

A study conducted on men who consumed extracts of green tea before their workout burned 17% more fat[6] than the ones who did not consume green tea. This study reported that green tea can increase the fat-burning effects of exercise. Instant Knockout fat burner contains about 500mg of green tea extract per serving.

Green Coffee Beans

It is nothing but a raw coffee or coffee bean that has not been roasted. It is a popular weight-loss supplement due to the presence of chlorogenic acid. Chlorogenic acid is an amino acid that has antioxidant, anti-inflammatory, and antihypertensive properties which help in high blood pressure.

However, when green coffee beans are roasted they lose all these properties. 

Chlorogenic acids[7] boost fat metabolism, and lower triglycerides and cholesterol levels. Chlorogenic acid helps by reducing the glucose levels in the liver. Since the body needs glucose for energy, when the glucose levels are low, the body burns fat to maintain the energy levels. 

Review studies reported[8] that consuming green coffee bean extract reduces body weight, body fat, and body mass index.

Furthermore, a 12-week-long study[9] reported that participants who consumed instant coffee that had chlorogenic acid lost about 5.4kg. In addition to this, an overall reduction of body weight, body fat, body mass index, and heart rate were reported.

Instant Knockout fat burner contains 100 mg of green coffee bean extract per serving.

Cayenne Pepper

Another popular weight loss supplement is cayenne pepper. Cayenne pepper contains capsaicin. Capsaicin[10] raises the body temperature and the body has to cool down. For this to happen, the body uses more energy levels than it does which leads to fat loss and weight loss.

Further studies reported that capsaicin suppresses appetite and boosts insulin sensitivity.  Our weight is largely dependent on metabolism, metabolism is the process of breaking down what we consume into energy to carry out everyday functions.

Capsaicin is a powerful metabolism booster and its supplements may aid in weight reduction by maintaining calorie deficit[11] and promoting fat burn. Instant Knockout fat burner contains about 100 mg of cayenne pepper per serving.


Glucomannan[12] is a plant-derived dietary fiber from the elephant yam or konjac plant. The fiber in it is low in calories and one of the best dietary fibers that are highly viscous. It can turn a glass of water into gel. Due to these properties, it suppresses appetite and keeps you full for longer.

This takes a longer time to digest and promotes fullness or satiety. Glucomannan makes it easy to maintain a state of calorie deficit. It keeps hunger and food cravings at bay. It delays the emptying of the stomach and promotes satiety[13].

A study conducted on obese patients showed that the average weight loss in people who consumed glucomannan was about 5.5 lbs for eight weeks. In addition to this, glucomannan helps improve blood sugar levels and also decreases the absorption of cholesterol.

A daily dose of Instant Knockout contains about 1800mg of glucomannan.

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See PhenQ Review

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  • Top-quality formula
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Health Benefits Of Instant Knockout Fat Burner

As mentioned earlier, Instant Knockout suppresses the appetite, boosts metabolism, increases energy, boosts insulin sensitivity, lowers cholesterol, ultimately burns fat, and helps lose weight. In addition to all these benefits, it also improves mood and brain activity.

Unlike most fat burners that target losing weight, Instant Knockout has mood enhancers that make you stick to the weight loss plan. A good mood and positive mindset can help in weight loss and you will more likely stick to healthy eating habits. 

Furthermore, It helps you maintain muscle mass, vitamin B6 in Instant Knockout helps our body in absorption of amino acids to help build muscle. The high amounts of caffeine in Instant Knockout give you more energy to work out and in turn result in muscle growth. 

Potential Side Effects

Firstly, it’s a rule of thumb to consult a doctor or dietitian before consuming fat burners, especially when you have medical conditions. Furthermore, pregnant and breastfeeding mothers should avoid an Instant Knockout. 

Coming to the side effects of Instant Knockout. Instant Knockout contains about 300 mg of caffeine per everyday serving and 4 tablets a day should be taken as per directions. This makes up to 400 mg of caffeine on a daily dose of serving. Considering this dosage for healthy adults. 

The caffeine amount in an Instant Knockout is high. Hence, it may cause caffeine-induced side effects[14]. Here are some of the side effects of Instant Knockout. 

Caffeine-Induced Side Effects

The side effects due to high amounts of caffeine are rapid heart rate, insomnia, increased anxiety, high blood pressure, fatigue, addiction, and digestive issues.

Difficulty Falling Asleep

The natural stimulants in Instant Knockout are to be blamed. You should consider taking only two capsules before lunchtime to reduce the caffeine intake by the end of the day. If you are consuming caffeine from any other sources, you should consider lowering your intake. 


To avoid choking, take each capsule with a large glass of water to help it glide down.

Stomach Upset

If you feel nauseous or get a vomiting sensation, try to reduce the intake. Consider halving the dosage for some time before going back to take four pills per day.  


Stimulants can give headaches, especially if you do not ingest caffeine normally. Consuming a large number of stimulants such as caffeine can give you headaches. You can reduce the dosage by reducing the number of pills and slowly increasing the dosage of up to four pills a day.


As per the product, to reap the total effects of Instant Knockout, consider taking one capsule four times a day with a time gap of 2-3 hours between each pill throughout the day. Take an Instant Knockout pill as soon as you get up. And one after a few hours of breakfast but before lunch. One capsule one hour after lunch and take the last one an hour before dinner. Instant Knockout is considered to be more effective when consumed on an empty stomach rather than with food. However, it’s meaningful because food can reduce the absorption rate and can reduce the effects of the capsule.

Instant Knockout Reviews: What Are The Real Results?

Instant Knockout has received an overwhelming number of positive reviews and ratings across the world. Many users have expressed positively about the results of this product. A majority of the users seemed to have burned a significant amount of fat, while also being able to stay energized throughout the day. Anyhow, here are a few Instant Knockout reviews by original users of the product:

“Love these pills lost a lint 30 pounds in less than a month with the help of these couldn’t of done it without great product third time buying will buy more.”


“I’ve tried many different fat burners and for this one is not bad, I am impressed for everything’s it says is in it!!!! Overall great buy it works and is a great product”


“This is my second time using this to drop the dreaded winter weight gain. Worked great last time so I expect similar results. I learned last time to drink a lot of water with it. When I say a lot I mean 16-24 oz. each dose, this avoids any upset stomach and keeps you hydrated. Eat right snd do at least moderate exercise and this will work.”


The Bottom Line

Instant Knockout fat burner is a legitimate product that contains all-natural ingredients to burn fat. Taking an Instant Knockout not only helps to burn more calories and in shedding pounds but also improves overall health by regulating blood glucose levels, and cholesterol levels.

Combining a proper diet and exercise along with Instant Knockout can help yield better results.

Frequently Asked Questions

Where can I buy Instant Knockout?

Instant Knockout is sold only on their official website. Roar Ambition does not sell its products on any third-party sites.

Does Instant Knockout work?

Use Instant Knockout as per the product guidelines and follow a proper diet and exercise.

+ 14 Sources

Tnhealth has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. We work mostly with peer-reviewed studies to ensure accurate information. We avoid using tertiary references. You can learn more about how we ensure our content is accurate and current by reading our editorial policy.

  1. Tabrizi, R., Saneei, P., Lankarani, K.B., Akbari, M., Kolahdooz, F., Esmaillzadeh, A., Nadi-Ravandi, S., Mazoochi, M. and Asemi, Z. (2018). The effects of caffeine intake on weight loss: a systematic review and dos-response meta-analysis of randomized controlled trials. Critical Reviews in Food Science and Nutrition, [online] 59(16), pp.2688–2696. Available at: 
  2. ‌Keithley J;Swanson B (2015). Glucomannan and obesity: a critical review. Alternative therapies in health and medicine, [online] 11(6). Available at: 
  3. Park, U.-H., Jeong, H.-S., Jo, E.-Y., Park, T., Yoon, S.K., Kim, E.-J., Jeong, J.-C. and Um, S.-J. (2012). Piperine, a Component of Black Pepper, Inhibits Adipogenesis by Antagonizing PPARγ Activity in 3T3-L1 Cells. Journal of Agricultural and Food Chemistry, [online] 60(15), pp.3853–3860. Available at: 
  4. ‌Westerterp-Plantenga, M.S. (2010). Green tea catechins, caffeine and body-weight regulation. Physiology & Behavior, [online] 100(1), pp.42–46. Available at: 
  5. ‌Dulloo, A., Seydoux, J., Girardier, L., Chantre, P. and Vandermander, J. (2000). Green tea and thermogenesis: interactions between catechin-polyphenols, caffeine and sympathetic activity. International Journal of Obesity, [online] 24(2), pp.252–258. Available at: 
  6. ‌Auvichayapat, P., Prapochanung, M., Tunkamnerdthai, O., Sripanidkulchai, B., Auvichayapat, N., Thinkhamrop, B., Kunhasura, S., Wongpratoom, S., Sinawat, S. and Hongprapas, P. (2008). Effectiveness of green tea on weight reduction in obese Thais: A randomized, controlled trial. Physiology & Behavior, [online] 93(3), pp.486–491. Available at: 
  7. ‌Meng, S., Cao, J., Feng, Q., Peng, J. and Hu, Y. (2013). Roles of Chlorogenic Acid on Regulating Glucose and Lipids Metabolism: A Review. Evidence-Based Complementary and Alternative Medicine, [online] 2013, pp.1–11. Available at: 
  8. ‌Tabrizi, R., Saneei, P., Lankarani, K.B., Akbari, M., Kolahdooz, F., Esmaillzadeh, A., Nadi-Ravandi, S., Mazoochi, M. and Asemi, Z. (2018). The effects of caffeine intake on weight loss: a systematic review and dos-response meta-analysis of randomized controlled trials. Critical Reviews in Food Science and Nutrition, [online] 59(16), pp.2688–2696. Available at: 
  9. ‌Vinson, J., Nagendran, M.V. and Burnham, B.R. (2012). Randomized, double-blind, placebo-controlled, linear dose, crossover study to evaluate the efficacy and safety of a green coffee bean extract in overweight subjects. Diabetes, Metabolic Syndrome and Obesity: Targets and Therapy, [online] p.21. Available at: 
  10. ‌Rogers, J., Urbina, S.L., Taylor, L.W., Wilborn, C.D., Purpura, M., Jäger, R. and Juturu, V. (2018). Capsaicinoids supplementation decreases percent body fat and fat mass: adjustment using covariates in a post hoc analysis. BMC Obesity, [online] 5(1). Available at: 
  11. ‌Janssens, P.L.H.R., Hursel, R., Martens, E.A.P. and Westerterp-Plantenga, M.S. (2013). Acute Effects of Capsaicin on Energy Expenditure and Fat Oxidation in Negative Energy Balance. PLoS ONE, [online] 8(7), p.e67786. Available at: 
  12. ‌Devaraj, R.D., Reddy, C.K. and Xu, B. (2019). Health-promoting effects of konjac glucomannan and its practical applications: A critical review. International Journal of Biological Macromolecules, [online] 126, pp.273–281. Available at: 
  13. ‌Howarth, N.C., Saltzman, E. and Roberts, S.B. (2009). Dietary Fiber and Weight Regulation. Nutrition Reviews, [online] 59(5), pp.129–139. Available at: 
  14. ‌Temple, J.L., Bernard, C., Lipshultz, S.E., Czachor, J.D., Westphal, J.A. and Mestre, M.A. (2017). The Safety of Ingested Caffeine: A Comprehensive Review. Frontiers in Psychiatry, [online] 8. Available at:


Rick is a Final Year Medical Student. Passionate about medicine, fitness and personal growth, he is always ready to challenge himself to accomplish tasks and especially spread correct medical information to people. Rick is a long-term… See More

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