Summer is upon us, and we got to be in the best shape:  be healthy, less bloated and have a physique to die for. But being the victim of late night snacking won’t give you a tone and sculpted body but belly flab and flabby arms.

Well, Instant Knockout is a best fat burner that targets stubborn fat.  Following a lot of research, we conclude that Instant Knockout is among the best fat burners in the market, as seen in this review.

You have probably decided to buy it, and you are searching for some correct information regarding its side effects.

Supplements often have some allergic reactions, but the magnitude may vary. Instant Knockout is not an exception. It contains components and additives that may cause side effects to the user.

It is made of 100% natural ingredients, which is likely to minimise the risk of side effects. But, even natural ingredients have 1-2% health risk, especially if there are natural stimulants present.

Most Instant Knockout users report the following side effects

  • Light Headedness
  • Headaches
  • Irritability
  • Mood Swings
  • Stomach Upsets
  • Sleeping Problems
  • Heart Burn
  • Dizziness
  • Nervousness

What Could Be Causing These Side Effects?

The manufacturer claims that Instant Knockout is safe to the user because it contains natural ingredients. But high doses of specific ingredients may be problematic.

Take a look


Instant Knockout contains a higher dosage of unroasted coffee beans and coffee anhydrous. It is high in antioxidants and caffeine which could lead to

  • Insomnia
  • Headaches
  • Nausea
  • Stomach upsets
  • Anxiety
  • Lightheadedness

Green tea

Instant Knockout contains a higher recommended dosage of Green Tea. Most people seem to tolerate it well; however, some users reported allergic reactions.

When taken on an empty stomach Green Tea may result in hepatotoxicity which may cause the following side effects

  • Stomach irritation
  • Headaches
  • Sleeping difficulties
  • Vomiting
  • Dizziness


Glucomannan is considered safe.

But some individuals experience diarrhoea, flatulence and bloating.

It may also lower the absorption and effectiveness of some diabetic medications.

How Can You Avoid The Side Effects?

The manufacturer warns against using more than the recommended daily dose or abusing the drug.

Instant Knockout contains caffeine, avoid taking late in the night to minimise the risk of insomnia. The last pill should be taken six hours before sleep.

To lessen the risk, avoid Instant Knockout if

  • Under 18 years
  • Pregnant or breastfeeding
  • You have a history of liver, kidney or cardiovascular disease
  • Diabetic
  • If you have low sugar levels
  • Taking any other medication

Bottom Line

Instant Knockout is well tolerated by most people and has minimal chance of side effects. The company uses the higher recommended dose of caffeine, but it is safe to use.

It is free from synthetic additives, banned substances and GMO products.

Due to its high stimulant content, you should minimise your use of other caffeinated drinks/beverages.

It is advised to start with a low dosage of the product to see how your body reacts to it, and increase the dosage with time.

Always consult your physician before taking Instant Knockout to rule out other risks.