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Instant Knockout Fat Burner Review: Is It Safe and Effective?

Written by Markita Lewis, MS, RD

Published on February 11, 2021

Our Expert Rating:

3.9

About This Rating
The average rating of this product is calculated based on the evaluation of the following factors:
  • Support for Claims:4.7
  • Ingredient Safety:4.0
  • Value for the Price:4.0
  • Brand Transparency:3.0

Instant Knockout is a fat-burning supplement made for professional MMA fighters and boxers but is useful for any active adult looking to get leaner. Many of its ingredients are backed by research to help support your metabolism, so this supplement may be worth its price.

Instant Knockout Fat Burner Review: Is It Safe and Effective?

Pros

  • Little risk for side effects
  • Transparency about concentration of ingredients in supplement

Cons

  • Not all ingredients show consistent results in human research
  • Return policy is very strict

What Is Instant Knockout?

Instant Knockout is a fat burning supplement developed with professional MMA fighters and boxers in mind.

Even if you’re not a professional fighter, Instant Knockout claims that it can help active men and women kickstart their metabolism and improve their body composition.

This supplement is claimed to help individuals speed up weight loss by boosting their body’s natural metabolic rate, reduce hunger cravings, and fuel energy levels.

Instant Knockout is one of the premium sports supplements formulated by Roar Ambition.

Evaluation of Ingredients

Green Tea Extract

Green tea extract contains caffeine and catechins to aid with energy burning and weight loss.

It can increase brown fat activity and help increase energy expenditure.

Cayenne Pepper Seeds (100mg)

Cayenne and chili peppers contain antioxidants, vitamins, and capsaicin that help with weight loss.

Capsaicin is known to activate the sympathetic nervous system (which helps regulate the metabolism), increase energy expenditure and diet-induced thermogenesis, decrease energy intake, and improve satiety.

Capsaicin can even reduce cravings for salty, sweet, or fatty foods.

Glucomannan (1800mg)

Glucomannan is a water-soluble fiber from the tuber or root of the elephant yam, a tropical plant primarily grown in South and Southeast Asia, the Pacific Islands, and Africa.

It is marketed as a weight loss supplement, but the research is inconsistent in showing that glucomannan can reduce body weight over time.

Caffeine Anhydrous (300mg)

Caffeine anhydrous is shown to help reduce weight, fat mass, and BMI.

If caffeine anhydrous is taken before a meal (approximately 0.5–4 hours before), it may help suppress appetite.

Caffeine is known to improve mood and cognition, and can decrease perceived exertion and pain during workouts.

These things together can help improve exercise performance.

Vitamin B6 (5mg, 250% DV)

Vitamin B6 is a water-soluble vitamin that helps to regulate metabolism in the body.

In metabolism, it is necessary for the biosynthesis of amino acids and the metabolism of other nutrients.

Vitamin B12 (10mcg, 166%)

This supplement contains vitamin B12 as cyanocobalamin, and is another water-soluble vitamin.

It is necessary for carbohydrate and fat metabolism within the cell and is also required for the metabolism of some amino acids.

GTF Chromium (100mcg, 82%)

Chromium is an essential trace mineral and is the biologically active component of the glucose tolerance factor (GTF), which enhances the action of insulin in the body.

Animal studies find a relationship between supplementation with GTF extracted from yeast and improvements in weight, body composition, and insulin sensitivity.

Human studies find some association between chromium supplementation and weight loss and decreased body fat percentage in overweight and obese individuals.

Zinc (10mcg, 150%)

Zinc is a mineral important for metabolism, endocrine function, and the production of testosterone to promote muscle growth and strength.

A study found that intake of a supplement containing zinc and magnesium increased Insulin-like Growth Factor-1 (IGF-1), which increased serum testosterone.

Piperine (10mg)

Piperine is an alkaloid that comes from black pepper extract. Studies find that piperine can inhibit the creation of new fat cells.

One animal study found that obese rats on high fat diets and dyslipidemia (an abnormal level of cholesterol) had decreased body fat mass and blood lipids.

Green Coffee Bean (100mg)

Green coffee bean extract comes from coffee beans that haven’t been roasted and contains higher levels of chlorogenic acid (a polyphenol and antioxidant) compared to roasted coffee.

A meta-analysis of trials found that supplementation with green coffee bean extract for more than 4 weeks significantly reduced BMI and body weight, with greater effects in individuals with BMI over 25kg/m².

Verdict on Claimed Benefits

Here is our summary of the available support for the claimed benefits of Instant Knockout, based on the available studies:

  • Boosts your body’s natural metabolic rateStrong Evidence
  • Reduces hunger cravingsGold Star Evidence
  • Fuels energy levelsGold Star Evidence

Side Effects, Safety, and Dosage

The max dosage for Instant Knockout is 4 capsules per day.

The dosage is spread throughout the day – you take one capsule first thing in the morning, one before lunchtime, one in the afternoon, and the last before the evening meal.

If you take your last dose of Instant Knockout too late at night, it could interfere with getting adequate sleep – a side effect of most stimulants.

It’s recommended to have at least 5 hours between your last dose and when you go to bed.

Because Instant Knockout contains stimulants, do not take this supplement with other products that contain caffeine or other stimulants.

This supplement is recommended only for adults ages 18+. Do not take this supplement if you are pregnant or nursing.

If you have any medical conditions or are currently taking medications, be sure to consult a health professional before use.

Cost and Where to Buy

Instant Knockout Fat Burner is available in a few bundles to meet your needs from the Instant Knockout website:

  • A one-month supply (1 bottle) costs $59 and the cost of shipping.
  • A two-month supply (2 bottles) costs $118 and has free delivery in the USA and UK.
  • The Ultimate Shredding Stack (3 bottles) costs $185 and includes one free bottle, free worldwide delivery.

Returns are only available for unopened and unused products and have to be done within 30 days of receipt in the US and only after 14 days of receipt in the UK and the rest of the world.

This strict return policy does pose a risk for you to invest a lot of money upfront for a product that you may or may not like without the chance for a trial period.

The cost of this fat-burning supplement is on par with other capsule fat burners I found on the market.

How It Compares

I found it refreshing to see that Instant Knockout was upfront about the concentrations of ingredients it uses.

Some other popular brands will have a proprietary blend of ingredients, and it is difficult to determine if the ingredients are in significant amounts to actually work.

The recommended daily dosage for Instant Knockout is four capsules per day.

There are other competitors that provide a fat boosting formula requiring fewer pills per day, which may be more convenient to remember.

However, with fewer pills, the concentration of active ingredients may be limited.

The Bottom Line

Instant Knockout appears to be a promising fat-burning supplement that does not include ingredients irrelevant to fat loss and metabolism.

Most of the ingredients in this product are backed by solid research, making me feel more certain about its efficacy.

This could be a safe fat-burning supplement to incorporate into your wellness journey if you are active and looking for faster weight loss. Still, it is best to check with your doctor before starting a supplement (especially if you may be sensitive to stimulants).

A Word from Our RD

I regularly speak with clients who desire to lose weight, and I notice the same trends: they need to work on exercise and changing their diet.

A diet focused on lean protein, fruits and vegetables, moderate portions of whole grains, and healthy fats can help support your metabolism and weight by providing the nutrients you need for your body to function well.

For some of my clients who have made dietary changes and still find weight loss challenging, one of the culprits is lack of exercise.

Incorporating regular strength-building and cardio exercise for 150–300+ minutes per week is needed for improved fat and weight loss.

The most important thing to remember is that fat-burning and changing your body composition cannot happen with a supplement alone.

I recommend turning to lifestyle changes before expecting a pill to change things without any effort on your part.

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