Prime Shred vs Instant Knockout (Which is Better?)

If you want to lose weight, then Prime Shred or Instant Knockout might be the right supplement.

They are both weight loss boosters that promise to help you reach your fitness goals. But which is better? We have compared every aspect of the two supplements to answer this question. 

Our Pick
Instant Knockout

Instant Knockout is our top fat burner for men. Our research shows it has a more effective ingredients formula than anything else on the market. 

Comparison at a Glance 

There are only a few differences between Instant Knockout and Prime Shred, which are summarised below. 

  • Use Instant Knockout if you want a product that has legitimate customer reviews 
  • Use Prime Shred if you want a cheaper supplement 

Ingredients Comparison    

What is the formula of the two supplements, and how do they compare? Let’s find out. 

Instant Knockout 

Caffeine, in the form of Green Coffee Bean, is the main ingredient of Instant Knockout. This is particularly great for boosting energy, which is essential for being able to perform physically and be active, which is vital for burning fat. 

Caffeine also boosts thermogenesis, which is the process of energy dissipating through your body as heat is produced. Thermogenesis leads to more calories being burnt and therefore aids in weight loss. 

Instant Knockout also contains vitamins B6 and B12, which are both known to be great for elevating mood.  

Vitamin B6 helps to speed up metabolism, which is an important part of fat burning.  

Vitamin B12 has been shown to boost energy levels, which supports physical performance. 

Another ingredient in Instant Knockout is Glucomannan. Studies have found that this promotes good digestion and can help treat constipation, which is crucial to weight loss. 

One study found that people who took Glucomannan supplements saw significantly more weight loss than those who didn’t. 

Glucomannan can also suppress appetite and make you feel full for longer, so you consume fewer calories throughout the day. 

Prime Shred 

Prime Shed contains Green Tea Extract, which has been found to speed up fat burning by boosting metabolism. It also promotes the hormone norepinephrine, which is crucial in fat burning.  

Furthermore, Green Tea Extract can reduce triglyceride levels, a type of fat that gets stored in fat cells. 

Prime Shed is also made from Green Coffee. This helps speed up your metabolism and promotes thermogenesis to burn fat faster.  

Green Coffee also boosts energy, reduces lethargy, and increases focus. 

Another ingredient that boosts thermogenesis in Prime Shed is Cayenne Pepper. It also helps to increase metabolism, as many other ingredients in this supplement do.  

Studies have shown that Cayenne Pepper is also able to reduce hunger. It is believed it can do this due to the pepper containing capsaicin, which is thought to reduce the production of ghrelin, a hormone responsible for making you feel hungry. 

One study found that people who took capsaicin daily ate up to 16% less than those who didn’t. 


There is no winner when it comes to ingredients.  

The two supplements contain very similar ingredients, all of which are said to be completely natural. 

Also read: our comparison of Hydroxycut and Instant Knockout

Safety and Potential Side Effects 

Before buying or using any supplement, it is very important to understand its potential side effects.  

Instant Knockout 

Whilst Instant Knockout isn’t FDA-approved, the FDA does regulate its production.  

Some side effects customers report include vomiting, nausea, headaches, and an upset stomach.  

Many people have also said they struggled to sleep after taking the supplement, especially if they took it later in the day, which is likely because it contains caffeine. 

If you experience any side effects, you should lower your dosage and, if you’re worried, speak to a doctor. 

Prime Shred 

Prime Shred is not FDA-approved, although the facilities in which it is produced are. 

The company assures that there are no known side effects of Prime Shred due to it containing only pure, natural ingredients.  

However, our research found that some ingredients individually bring risks of side effects, including nausea, diarrhea, skin rashes, bloating, trouble sleeping, and even depression because of taking Prime Shred.  


There is no winner when it comes to side effects.  

Both supplements have potential side effects of similar severity.  

Customer Results 

Let’s take a look at some real-life results people have experienced from using these weight loss supplements. 

Instant Knockout 

Reviews of Instant Knockout were found on Amazon, its official website, and individual blog posts written by customers. 

A typical result was a boost in energy, with people saying they could work out more frequently. 

Customers also reported seeing body changes quickly in a few weeks, with the fat shedding off them. 

One customer said they lost 15 lbs of fat in just 2 months. How amazing is that?! 

There were some negative reviews, with people saying the supplement didn’t work for them and that they saw no change when using it. People also reported struggling with the caffeine content, experiencing sleeping difficulties and energy crashes.  

Prime Shred 

Our research found no customer reviews of Prime Shred on amazon, trust pilot, or even on the supplement’s official website.  


Instant Knockout is the clear winner in this category.  

You can find reviews on Instant Knockout in various places, many of which are very positive, whereas there are no reviews online for Prime Shred, which means its legitimacy and effectiveness cannot be vouched for. 

Manufacturing and Brand 

Who manufactures the two weight loss supplements, and are they reliable? 

Instant Knockout 

The manufacturers of Instant Knockout are a company called Roar Ambition. They operate in the UK and USA in manufacturing facilities that are FDA-approved and GMP certified.  

The company assures that the formula of Instant Knockout is vegan-friendly, made with entirely natural ingredients that have been specially selected. 

Roar Ambition also only use ingredients for which there is scientific evidence for their ability to aid in weight loss. 

Prime Shred 

MuscleClub Limited manufactures prime Shred. They are based in the United States, and their manufacturing facilities are FDA-approved, and GMP certified.  

MuscleClub is known for making other famous supplements, including Testogen, which is a testosterone booster. 

The manufacturers assure that they use 100% natural ingredients, with no filler, chemicals, or other artificial materials going into their products. 


Neither supplement wins here.  

Both products are made in FDA-approved and GMP-certified facilities and assure customers that they only use natural ingredients. 

Price and Value for Money 

You might be wondering how much these supplements will set you back. Well, let’s find out and see if they are worth opening your wallet for. 

Instant Knockout 

For one month’s supply of Instant Knockout, it will cost you $59.00.  

If you want to be automatically sent a new bottle every month to save you from reordering every time you run out, you can sign up for their subscription service and save 10% on each bottle.  

Something else that Instant Knockout offer is when you buy 3 bottles in one order, you get an extra bottle for free. 

If you are ordering from the UK, you will get a 14-day return window, and if you’re ordering from the USA, the return policy is 30 days. 

Prime Shred 

One bottle of Prime Shred, which will last you about a month, is $49.95 with a $7.95 shipping cost.  

Buying three bottles will cost you $99.95, which is a considerable discount as this works out to $33 per bottle. You also get free shipping. 

You also get a 100-day return policy where you are guaranteed a refund if you are unhappy with your product within this time. 


Prime Shred is the winner when it comes to price.  

It costs considerably less than Instant Knockout and has a much longer return window of 100 days than Instant Knockout’s 30-day policy. 

Pros and Cons 

Instant Knockout 


  • Boosts weight loss 
  • Boosts energy 
  • Manufactured in FDA-approved and GMP-certified facilities 
  • Supplement regulated by the FDA 
  • Subscription service available 
  • 14-day or 30-day return policy 
  • Positive and legitimate customer reviews 
  • Well known supplement  


  • Caffeine can be over-stimulating for some people 
  • Not FDA approved 
  • Can be expensive 
  • Side effects possible 

Prime Shred 


  • Discounts when bought in bulk 
  • 100-day return policy 
  • Manufactured in FDA-approved and GMP-certified facilities 
  • Only made using 100% natural ingredients 
  • Fairly affordable 


  • Not FDA approved 
  • Side effects possible 
  • No customer reviews found 

Final Verdict 

Instant Knockout is the winner in this weight loss supplement battle.  

There are many similarities between Instant Knockout and Prime Shred, such as their ingredients, their potential side effects, and what results they promise to bring.  

However, the lack of reviews on Prime Shred brings a lot of doubt to its ability to deliver what it promises and the overall legitimacy of the product. Therefore, we would recommend going for Instant Knockout over Prime Shred. 

Our Pick
Instant Knockout

Instant Knockout is our top fat burner for men. Our research shows it has a more effective ingredients formula than anything else on the market.