Instant Knockout vs Legion Athletics Phoenix Fat Burner [One Works!]

Instant Knockout vs Legion Athletics Phoenix Fat Burner

Disclaimer: This post may contain affiliate links, meaning, at no cost to you, we may receive a commission if you decide to click through and make a purchase.
Affiliate earnings help us with the cost of maintaining this website, but rest assured that if a product isn’t safe and effective – We DO NOT recommend it or include affiliate links!
Please read our Disclosure for more.

Instant Knockout vs Legion Athletics Phoenix Fat Burner

When it comes to burning fat, you want to make sure you do it safely. Will either product in our Instant Knockout vs Legion Athletics Phoenix Fat Burner comparison be able to give us safe results?

We say this because recently we have reviewed a handful of fat burners that we have had to warn our readers about. We don’t mean this in a good way either.

In order for us to recommend a product, it must be clean of course!

So, what are we looking for today? A product that can do the following is a good start:

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

Anything less than this and it will not be getting our approval. So, let’s see what they have in store.

Instant Knockout vs Legion Athletics Phoenix Fat Burner: Who Makes These Products?

Roar AmbitionInstant Knockout Review

The people behind Instant Knockout are this UK based company.

They might be based there, but they ship directly from both the UK and USA.

Roar Ambition makes everything in FDA approved facilities to GMP certifications so everything is done by the book. We like that they revise and amend their ingredients and dosages regularly. This means the customer is always getting the most up to date version of their supplements.

Also, this fat burner comes with a big 90-day money back guarantee. This makes purchasing risk-free (as it should be!).

If endorsements impress you then you will like Roar Ambitions. UFC fighter Diego Sanchez puts his name to this fat burner. He uses it to make weight before a bout.

They are also the team behind the T Booster TestoFuel. This is endorsed by former Mr. Universe Robby Robinson.

Legion AthleticsLegion Athletics Phoenix Fat Burner

We like the stripped back approach of this US-based company.

They again make their products in FDA approved facilities and have a 100% money back guarantee.

There is also free worldwide shipping with their supplements. Legion Athletics appear to be against a lot of the industry’s money grabbing brands. We are all for this and have seen the evidence of it based on sub-par products.

The man who created the company is Mike Matthews. He is a health and fitness author and according to the site, wasted 1000’s of his own dollars on bad products and wanted to reverse this.

Legion Athletics supplements range from pre-workouts to fish oil and joint support.

Time to see what they have to offer.

Instant Knockout vs Legion Athletics Phoenix Fat Burner Ingredients

This is where we can get to know them properly.

With no place to hide it is good to see that neither product uses proprietary blends. This means we get to see all the dosages and can tell if an ingredient will be effective or not.

The suggested serving does favor Instant Knockout. They advise taking one capsule 3-4 times a day which really spreads out the fat burning benefits. Compare this to Legion Athletics 3 capsules with your first meal, then 2 later on in the day which isn’t going to have the same effect.

Mutual Ingredients

Green Tea Extract

An excellent start from both, this is one of the best fat burner ingredients you could wish for.

Simply because it has been proven to work. Green Tea extract works as a thermogenic. This means it heats the body up on the inside, causing it to burn fat to cool itself down again.

The catechins in particular are of benefit here. They work as antioxidants which help the body to fight against disease. does comment that they are anti-obesity and anti-diabetic which makes this ingredient even more impressive. Also, your endurance levels in the gym will be enhanced.

WebMD tells us that Green Tea is a milder stimulant than Caffeine Anhydrous and contains just 2-4% Caffeine. This is will still give you a boost to your alertness and thinking as well.

The 400 mg included in Legion Athletics Phoenix Fat Burner represents a very useful dosage as does the 500 mg in Instant Knockout.

Individual Ingredients

Instant Knockout


A very effective start for Instant Knockout.

The energy increase that you will get from consuming caffeine is a good place to start. If you are using a fat burner alongside a diet that restricts calories, this will be very welcome.

Caffeine also gets your metabolism on the move and it has so many benefits that it wouldn’t be out of place in supplements such as pre workouts and nootropics.

The version we have here is Caffeine Anhydrous. This is a powdered form that is popular in energy drinks. The benefit is that it is quickly absorbed by the body.

The dosage of 350 mg in Instant Knockout will be well tolerated, particularly because it is split into 4 different servings a day.


Yet another great fat burner.

The proven ingredients are all that matter and here we have another.

WebMD comments that it can decrease LDL (bad cholesterol) levels in people who have lower blood fat levels.

There are even studies that show how Chromium can be of use for communicating with the brain to tell the body that it is full. This makes it an appetite suppressant.

100 mcg in Instant Knockout is a really good dosage that will be of use once again.

Cayenne Powder

Up there with the best natural fat burning ingredients going.

It is another thermogenic for a start meaning you will be burning even more fat as you rest.

WebMD tells us that is is also good for appetite suppression. They actually say that it has been found to curve appetite, especially in those who do not already eat spicy foods.

A good ingredient in many ways and supplementing it is a useful way of getting the benefits without enduring the spice.

The 100 mg included is an optimal dosage.

Black Pepper Extract

A useful ingredient but one that doesn’t directly burn fat.

Still, it has its place in a fat burner. This is because it enhances the capabilities of the other ingredients.

This means if the rest of the inclusions in Instant Knockout are effective, it is a very sensible ingredient to get into your supplement.

Green Coffee Bean Extract

Another really effective ingredient.

This is basically coffee before the color and chlorogenic acid has been removed. It is also what is great for fat burning. It stops you from storing as much fat and keeps your blood sugar levels under control.

WebMD does tell of a study that looked into adults with obesity 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.

The 100 mg included will really help.

Vitamin B6

A B-vitamin that works in a similar way to others in that it helps us to make energy from food.

It converts it into glucose to be used as energy.

Also, B6 has links to enhancing metabolism, making the 5 mg a really good amount once more.

Vitamin B12

Another one that stops the body from storing as much fat.

It is good to get into your body as it isn’t something we can naturally create. Also, a lot of the regular sources are meat, dairy and fish meaning vegetarians and vegans will benefit even more.


A regular in T Boosters but why a fat burner?

Well, Zinc helps with glucose metabolism which also stops us from storing as much fat.

Zinc has also been found to improve the mood of the user according to – good if you are dieting and this makes you feel grumpy!

The 10 mg is an optimal amount.


Another top ingredient for fat burning.

This time it is because this dietary fiber is an appetite suppressant.

It absorbs water and swells in the stomach, this makes you feel full and less likely to snack in between meals.

At 500 mg you are getting a really useful dosage.

Legion Athletics Phoenix Fat Burner

Advantra Z (6% Synephrine)

If you were to choose a fat burning ingredient to kick off your product, this would not be the one!

It is a stimulant which would be completely fine, only it isn’t when it comes to this one in particular. Synephrine is a banned substance in various sporting organizations and can cause side effects.

Although this is more likely when taken alongside Caffeine, and this product does not contain it, Legion Athletics themselves advise you to take with Caffeine.

WebMD actually say that it can be unsafe when taking as a weight loss supplement. They also tell us that the potential side effects include burning, dizziness, stinging, blurred vision, drowsiness and more.

Sometimes known as Bitter Orange it is certainly one to keep an eye out for.

It is important to note that if you are subject to sports testing through an organization then check with them first before you consume this ingredient.

The 834 mg included is a large amount as well so it is not the best of starts here.


PubChem tells us that Naringin is the major flavonoid glycoside in grapefruit and gives grapefruit juice its bitter taste. says that Grapefruit does appear to reduce fat mass in groups that consumed it, compared to a Placebo group.

The problem with this is that the effects are thought to be minor which is not what we are after.

Naringin is thought to be able to boost metabolism which is a trait we always like to see in this type of supplement. The polyphenols, in particular, are of benefit for this.

It is also believed that it can boost your digestive system, which results in greater weight loss. The mild effects are just a bit disappointing though.

The 600 mg is a big amount showing they really believe in it. We just don’t at the same level.


An ingredient that is thought to be able to communicate with the brain to tell it the body is full.

We are all for these types of ingredients and this is one that you will find in nootropic supplements as it works as a precursor to Serotonin. This is why 5-HTP is believed to improve mood.

Serotonin is actually a useful ingredient and has been shown to reduce appetite in those who take it and is even linked to lowering carb cravings.

Consuming too much isn’t a good idea though. Serotonin has been linked to heart-related risks in larger amounts.

However, to say that any weight reduction from using this ingredient does appear to be almost secondary to a reduction in food intake, and is not too remarkable in magnitude.

The 150 mg you are getting is also a lot less than what is believed to be an effective dosage. It doesn’t appear to be the most potent fat burning ingredient anyway.


Another ingredient that is probably better placed in a nootropic.

L-Tyrosine is an amino acid that can help you to deal with the effects of stress. This means it would help to keep the user in control when consuming stimulants. Keeping your focus and remaining calm is always a good thing. does say that any user who has a hyperactive thyroid should be wary when consuming L-Tyrosine. This is because it can raise thyroid production as it is a precursor for its synthesis.

Salicin (White Willow Bark Extract)

Not the best ingredient once again.

It is one that is thought to work in the same way as the likes of Black Pepper Extract. We have discussed why that is useful as it can enhance the benefits of other ingredients.

White Willow Bark Extract actually works in a similar way as Aspirin. This is because it alleviates pain but this isn’t what we are looking for here.

The 120 mg could be better spent on a proven fat burner.


An ingredient that is a plant chemical, classed as a bioflavonoid (WebMD) it is derived from citrus fruits.

Citrus fruits and fat loss do have a fair amount of links and you can see this product contains a few of them already.

WebMD also says that this one is possibly ineffective for weight loss. They discuss how some research shows that taking glucosyl hesperidin for 12 weeks does not reduce body weight in people that are modestly overweight.

The backing isn’t exactly strong for this one making the 100 mg another waste.


A member of the mint family this is a traditional ingredient that you see in supplements from time to time.

It might be of use here but the lack of proper studies backing it raises a few alarm bells once again. Some believe it can help with the breaking down of fat cells and even stop them from forming altogether.

It could also be an appetite suppressant but this is even disputed. When taken orally, it is thought to be ineffective making it a less than desirable inclusion.

Hordenine HCL

Another indirect fat burner.

It isn’t the first ingredient that does this today but it is one that is thought to enhance the benefits of the other ingredients.

The problem though is that Legion Athletics Phoenix Fat Burner doesn’t contain enough for it to be of proper use.

Most of the time, this would mean an even better supplement that can boast of more thermogenic capabilities, more metabolism boosting and appetite suppression. Unfortunately, this isn’t really the case for this product.

Instant Knockout vs Legion Athletics Phoenix Fat Burner Side Effects

The easy to place to start is by saying that Instant Knockout contains proven fat burners that are safe to consume. Also, the dosages are great meaning they will be effective but well tolerated at the same time.

The same can’t quite be said for Legion Athletics Phoenix Fat Burner.

Their use of Synephrine makes it a product with potential side effects. These include the likes of burning, stinging, blurred vision, dizziness, drowsiness and more it is certainly an ingredient you will not want to consume.

For us, there is no point in taking any risks.

Instant Knockout vs Legion Athletics Phoenix Fat Burner Pros and Cons

Instant Knockout Pros

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

Legion Athletics Phoenix Fat Burner Pros

  • Green Tea a good ingredient
  • No proprietary blends

Instant Knockout Cons

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

Legion Athletics Phoenix Fat Burner Cons

  • Potential side effects
  • A lot of ineffective ingredients
  • Serving suggestion not ideal

Instant Knockout vs Legion Athletics Phoenix Fat Burner Conclusion

Winner: Instant Knockout

Buy Instant Knockout from:

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

A deserved victory today.

The competition could have been better and had Legion Athletics Phoenix Fat Burner not included Synephrine it would have been a little closer.

Still, Legion Athletics Phoenix Fat Burner wasn’t exactly jam-packed with proven fat burning ingredients.

Sure, they use Green Tea Extract in their formula but so did Instant Knockout. The difference was they also went on to use many of the best fat burning ingredients on the market.

Instant Knockout didn’t stop there though. With optimal dosages and a completely safe list of ingredients, they really have ticked every box. We mentioned earlier in the article that safety is something we haven’t seen enough of recently.

If you are serious about burning fat and are looking for a product that can really take your workout routine and lifestyle choices to the next level, Instant Knockout is as good as you are going to find.

Buy Instant Knockout from:


Leave a Reply

Your email address will not be published. Required fields are marked *