Instant Knockout vs Xenadrine Ultimate Weight Loss [Which One Is Better?]

Instant Knockout vs Xenadrine Ultimate Weight Loss

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Instant Knockout vs Xenadrine Ultimate Weight Loss

When it comes to burning fat you can’t take any risks. You need a proven product which is why our Instant Knockout vs Xenadrine Ultimate Weight Loss comparison should be a good one.

It pits two of the bigger brands on the market against one another to see which one can really get you shredded.

This is easier said than done though, if they are going to impress, they won’t be able to rely on packing and big promises.

They have to have the ingredients and dosages to deliver. We expect these to do the following:

  • Burn fat effectively
  • Be safe
  • Suppress appetite
  • Increase energy

Anything less than this will not do. So, which of our two fat burners can give us what we are looking for? Time to get to know them a little better first.

Instant Knockout vs Xenadrine Ultimate Weight Loss: Who Makes These Products?

Roar AmbitionInstant Knockout Review

Here we have the UK based company behind Instant Knockout.

They have built an excellent reputation online. You only have the check out the 100’s of before and after profiles around the net. Clearly, it is working wonders for many people.

Their commitment to customer service is also apparent. They review and amend their ingredient profiles regularly. This means the customer is getting the best possible version at all times.

There is even a generous money back guarantee with this product, making it risk-free as it should be.

In terms of endorsements, Roar Ambition have some impressive names. UFC fighter Diego Sanchez puts his name to this product, he uses it to make weight before a bout.

Also, they make a testosterone booster called TestoFuel. This is endorsed by former Mr. Universe Robby Robinson.

CytogenixXenadrine Ultimate Weight Loss

Here we have the USA based company behind Xenadrine Ultimate Weight Loss.

There is a 30-day money back guarantee with this product which is always good.

Xenadrine Ultimate Weight Loss also have some before and after profiles to back their product up. They all seem to be on their own website though and they are almost a little too slick for our liking. Some might question the legitimacy of the Xenadrine Ultimate Weight Loss before and after profiles because of this.

They are stocked in various stores that include the likes of Walmart and Target and at times are available as part of buy one get one free deals.

The claim on their site is that they have shifted over 9 million bottles. This gives you a sense of how big the company is.

With claims like this being a supplement that features a scientifically researched key ingredient for powerful weight loss. We have high hopes for its effectiveness.

The company is not free of controversy though.

The FDA contacted them in 2003 regarding their use of ephedra in their fat burner. This was when the company was called Cytodyne Technologies. This controversial ingredient was removed from their product before too long.

Instant Knockout vs Xenadrine Ultimate Weight Loss Ingredients

This is where we can really set these two apart.

The early signs aren’t great for Xenadrine Ultimate Weight Loss diet pills. They have a number of their ingredients contained in a proprietary blend.

This means the ingredients do not have their dosages revealed. Instead, the overall dosage for the ingredients in the blend is given.

Their suggested serving isn’t ideal either. They advise taking it just twice a day. For us, this doesn’t spread out the benefits in the same way as Instant Knockouts does. They advise taking one capsule 3-4 times a day.

Mutual Ingredients

Green Coffee Bean Extract

A great start for both, this is one of the best fat burner ingredients going.

This is coffee before the color and most of the chlorogenic acid has been roasted out. This is the beneficial part, it stops us from storing as much fat and gets your blood sugar levels under control.

WebMD tells us of a study that looked into adults with obesity. This found that taking Green Coffee Extract for between 8 to 12 weeks meant more weight loss for those when compared to others taking a placebo.

A proven ingredient to start with then. The dosage in Xenadrine Ultimate Weight Loss diet pills is 400 mg, a good amount.

They have put more weight behind it than Instant Knockout who have provided 100 mg which will still be useful here.

Caffeine Anhydrous

Here we have another effective fat burner.

The energy boost will be much appreciated by anyone looking to use a fat burner alongside a diet that restricts calories.

It is a proven ingredient that really gets your metabolism moving.

The anhydrous means it is a powdered form. This is easily absorbed by the body which is also what makes it popular in energy drinks.

The caffeine content in both is a good amount for enhancing focus as well. At 400 mg in Xenadrine Ultimate Weight Loss and 350 mg in Instant Knockout, you are getting an optimal amount.

Individual Ingredients

Instant Knockout

Vitamin B6

A useful fat burner here.

It is similar to other B-vitamins in that it plays a role in how our bodies create energy from food sources. B6 converts it into glucose which is then used as energy.

It even has links to boosting metabolism and the 5 mg included is another good dosage.

Vitamin B12

This can help prevent your body from storing as much fat so it is a useful ingredient.

We can’t actually create our own so supplementing it is a good idea. This is especially the case for vegetarians and vegans as prominent sources are meat, fish, and dairy.

It promotes red cell production meaning it will battle fatigue as well.

Green Tea Extract

Another great fat burner, it is up there with the very best.

This is because it works in a couple of ways and is proven to work.

It is a thermogenic meaning it heats the body up on the inside, causing it to burn fat to cool itself down. It is the catechins though that are really beneficial.

They work as antioxidants and even help to fight disease. Significantly, says that they are anti-obesity as well as anti-diabetic.

This ingredient has also been shown to enhance endurance levels which is good news for the gym.

WebMD says that Green Tea is a milder stimulant than the likes of Caffeine Anhydrous and it contains 2-4% Caffeine. It might be milder, but it will still provide a boost to your thinking and alertness.

The dosage of 500 mg will really make a difference as well.

Cayenne Pepper

The top fat burning ingredients are still coming from Instant Knockout.

Cayenne Pepper is another thermogenic, this means more burning fat as you rest. Not done yet though it is even an appetite suppressant.

WebMD backs this and says it has been found to curve appetite, especially in those who do not already eat spicy foods.

A great way of getting the benefits without having to endure the spice and the 100 mg included is another effective dosage.


Another really good ingredient.

Sure, it is a famous T boosting ingredient but has a reputation as a fat burner as well.

It stops the body from storing as much fat for a start. It has also been found to help with glucose metabolism. comments on how Zinc has also been shown to improve mood.

At 10 mg, it is yet another optimal dosage.


A good ingredient and one that can regulate blood glucose levels.

WebMD says Chromium can decrease LDL (bad cholesterol) levels in people who have lower blood fat levels.

It is also thought to be able to communicate with the brain to tell it that the body is full. This is why it is sometimes described as an appetite suppressant.


Nearly done but the ingredients have really impressed.

Here we have another proven appetite suppressant. This is a dietary fiber that swells in the stomach. This makes the user feel full.

This is what prevents you from feeling like reaching for a snack in between meals.

At 500 mg we are getting another big amount.

Black Pepper Extract

A useful ingredient and more of an indirect fat burner.

This is because it doesn’t actually burn fat itself. Instead, it enhances the capabilities of the other nutrients it is used alongside. Thankfully for users of Instant Knockout, their product is full of the best you could hope for.

Xenadrine Ultimate Weight Loss


An ingredient that comes with a level of controversy that we aren’t a fan of.

This is a shame as it was a strong start for them.

Sure, Yohimbine has fat burning benefits. It is an appetite suppressant for a start and can help the body to break down fats but it is the potential side effects that are the concern.

It can elevate blood pressure and according to WebMD, taking orally is possibly unsafe. WebMD also says that Yohimbine has been linked to reports of severe side effects that include heart attacks and seizures.

This is an ingredient that is not legal to sell as a dietary supplement in the US when it is the man-made yohimbine hydrochloride type.

A big dose can be even worse and the other side effects include sleep issues, irregular heartbeat, irritability and more.

The 40 mg included should be fne but it isn’t an ingredient we like to see.

The rest of the ingredients are in the proprietary blend.

Garcinia Fruit Extract

Back to the better ingredients.

It is an appetite suppressant and the skin is what is most beneficial.

It is high in hydroxycitric acid. This is good for fat loss and it increases fat oxidation during exercise.

One study shows how it helped slightly in terms of fat loss in comparison to a placebo group after 16 weeks.

For it to be effective you need around 400 mg. Since this is only a little less than the overall blend and there are various ingredients in there, it is unlikely that we are getting enough.


You can get this from Green Tea Extract as well but it can be useful for preventing you from gaining weight. The evidence to support this isn’t great as of yet though.

It can promote focus which is why you see it in pre-workouts and nootropic supplements.

The proprietary blend means we don’t know if we’re getting an effective amount or not.

Spearmint Leaf Extract

An ingredient that isn’t the most famous in terms of burning fat but does have its uses.

It is high in fiber so your cholesterol levels will be reduced. In general, mint is linked to using fat for energy so it could be a decent inclusion.

The dosage is needed though to see if it will really help.

Autumn Olive Fruit Extract

A lot of maybes here.

It may be useful as it has antioxidants which help to protect against diseases.

It would be more beneficial if it was Olive Leaf which helps with glucose metabolism. There aren’t any notable fat burning benefits from this ingredient so it’s not a good inclusion.

Ashwagandha Root and Leaf Extract

Not the best end to the ingredients.

There aren’t many strong links between it and fat loss and it will be more beneficial in a nootropic as it helps to reduce the effects of anxiety.

It could be here to help relax the user because of the level of stimulants which means it has a place in this product.

It would be good if we knew the dosage either way.

Instant Knockout vs Xenadrine Ultimate Weight Loss Side Effects

The good news is that Instant Knockout contains only natural ingredients that are safe and well dosed.

Xenadrine Ultimate Weight Loss is a different story.

It is the inclusion of Yohimbine that has links to potential side effects such as heart attacks and seizures, sleep issues, irritability, irregular heartbeat and more.

Instant Knockout vs Xenadrine Ultimate Weight Loss Pros and Cons

Instant Knockout Pros

  • Natural ingredients
  • Money back guarantee
  • Used by top athletes
  • Ships worldwide
  • Enhances metabolism
  • Suppresses hunger

Xenadrine Ultimate Weight Loss Pros

  • Some proven fat burners

Instant Knockout Cons

  • Not available in store
  • Shouldn’t take too late in the day because of the caffeine levels

Xenadrine Ultimate Weight Loss Cons

  • Proprietary blend
  • Potential side effects from Yohimbine
  • Some key fat burners missing
  • Previous controversy
  • Suggested serving not ideal

Instant Knockout vs Xenadrine Ultimate Weight Loss Conclusion

Winner: Instant Knockout

Buy Instant Knockout from:

(Clean Lean Machine tip: Get 1 box free when you buy 3 boxes!)

A well-deserved victory today.

Instant Knockout is hard to beat, in fact, it is the best fat burner we have seen. This is down to the carefully selected and proven fat burner ingredients. The dosages are all optimal and this means it really works.

Xenadrine Ultimate Weight Loss wasn’t the stiffest of competition although it had its plus points. It is easy to see why Instant Knockout has such a good reputation though.

It has everything –  appetite suppressants, fat burners, metabolism boosters and energy enhancers and more.

With so much going for it and a reputable company behind it, Instant Knockout really is the complete package.

Buy Instant Knockout from:

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