TestoFuel vs ISA-TEST GF – Which is the best T booster?

testofuel vs isa test gf

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TestoFuel vs ISA-TEST GF

Well, this one is sure to be interesting. Our TestoFuel Vs ISA-TEST GF review gives us a chance to look at two of the bigger names in the market. One for reputation, and one for market share.

We say it all the time, fancy packaging and big promises can only get you so far, but what will reputation do for a product? Sure, it can boost sales, but do the big companies give you what the emerging ones do?

We will find out today.

ISA- Test GF comes from one of the industry’s biggest names but this doesn’t necessarily mean you will be getting a better product. In order for it to really excel, it has to do the same thing as every testosterone booster out there does.

For a T booster to be considered great, it must give you the following:

  • More strength
  • Increased energy
  • Enhanced libido
  • Elevated mood

Can either of these products provide this effectively?

Our testosterone declines year on year from around the age of 30, supplementing it is becoming more and more popular as people realize they can do something about declining T levels. And do it safely.

We’re going to see which of these two popular T boosters can help the most.

First, let’s get to know them a little better.

TestoFuel Vs ISA-Test GF: Who Makes These Testosterone Boosters?

Roar Ambition

TestoFuel ReviewThe people who make TestoFuel are UK based company Roar Ambition.

They have built their reputation on delivering quality products and with the number of video testimonials on YouTube and elsewhere it seems they are a company in demand.

They put a lot of emphasis on customer service as well. They have a 90-day money back guarantee and they also review and amend their ingredients and dosages regularly. This ensures their customers are getting the best possible version.

On top of all this, they have some of the better endorsements that we have seen. None other than former Mr. Universe Robby Robinson puts his name to TestoFuel, for a guy in his 70’s he’s putting us all to shame!

They also have a fat burner called Instant Knockout. This is endorsed by UFC fighter Diego Sanchez, who uses it to make weight.


isa test gfISA-Test GF is made by one of the industry giants.

They have a really visual website, by this we mean they have gone for lots of different sections competing for your attention.

Based in the USA, they were founded in 2001 and have some impressive endorsements too. Brian Shaw the 4 x worlds strongest man being one of them.

Refunds are only possible for a first time purchase so if you are unsure but want to give them a second chance, you might want to consider this. We can’t find anything about a money back guarantee though.

They do have a lot of useful advice on their site with everything from fitness related articles and beyond. As you might expect, their store is full of almost every supplement going from pre-workouts to fat loss products. They also love a bit of merchandise as well.

TestoFuel vs ISA-Test GF Ingredients

This is where we can really get going.

The initial signs from ISA-Test GF are giving us a bit of a headache though. They are doing everything we dislike including the use of proprietary blends.

This is where they bunch a few ingredients into one new ingredient, only giving you the dosage of the total. This means we cannot see how much of many individual ingredients there is in each serving.

As a result, we cannot tell if some of the ingredients are effective or not. Still, we will take what we can form it, and some of the dosages are included.

The suggested serving is also not ideal.

They advise taking 4 capsules an hour before working out, or an hour before bed.

We prefer it when you can take it 3-4 times a day to spread out the benefits. This is the path that TestoFuel have taken which is good.

Let’s get into it then.

Mutual Ingredients

Vitamin B6

A good start for all.

This ingredient really reduces the effects of estrogen, a known killer of your T. In fact, less of it means your testosterone can really thrive so you will notice a difference.

Low levels of this might be linked to low testosterone, so it is important to keep it topped up.

The 7 mg in ISA-Test GF is a good amount, as is the 5 mg in TestoFuel.


Another great inclusion here.

It works by reducing the effectiveness of Sex Hormone Binding Globulin. This is what binds your T up and makes it useless, so if it cannot work as effectively then testosterone can work its magic.

It also reduces oxidative stress, meaning your body is better equipped to deal with the effects of aging and exercise.

It is also thought to be good for helping the body to build muscle – that’s what we’re talking about!

The dosage of 300 mg in ISA-Test GF is a good and optimal one, as is the 200 mg in TestoFuel.


THE ingredient to look out for in many people’s eyes.

This is because it is a good all rounder and works on so many different levels.

To start with, our bodies cannot produce T without it. On top of that, it stops our body from depleting all it’s testosterone levels during intense exercise, saving more of it for later.

It is also good for stimulating the luteinizing hormone. This communicates with the testes to create and release more testosterone.

There is 20 mg in ISA- Test GF which is an optimal dosage, as is the 10 mg in TestoFuel. It should be noted here that TestoFuel also has Oyster Extract as an ingredient. This is significant because it has a lot of Zinc in it, topping the level of this ingredient up.


A decent ingredient in that it is a proven libido enhancer.

T boosters need at least a couple of these ingredients so for that reason it deserves its place here.

Also good for keeping insulin levels at a healthy amount, this is important for your testosterone in order for it to thrive.

The 100 mg is a good amount from TestoFuel, in terms of ISA-Test GF we have no idea how much there is since it is part of a proprietary blend.

Individual Ingredients


Vitamin D3

This is one of the best T boosters going, look for this in your supplement of choice!

It is thought that low levels of D3 are linked to low testosterone, so it is important to keep this in your system.

Many diets are deficient in it so this makes supplementing it even more important. It’s a shame we even need to since our bodies create their own when our skin is exposed to direct sunlight, we clearly aren’t getting enough rays.

The 5,000 IU is a brilliant and optimal dosage.

D-Aspartic Acid

Again, considered to be one of the most important T boosting ingredients.

This works triggering the luteinizing hormone once again but also increases sperm count. On top of this, it even triggers the synthesis of the Human Growth Hormone.

With so much going for it, it is no wonder that TestoFuel has included 2,300 mg, another optimal dosage of another top ingredient.


Vitamin C

This is the first ingredient on the label here and we are not sure why.

Usually, you save this space for one of your flagship ingredients (TestoFuel have Vitamin D3 at the top of their list – and on merit!).

Vitamin C does have some good general health benefits, but in terms of directly boosting your testosterone, it is a pointless inclusion.

Velvet Bean

Better form ISA-Test GF as this is otherwise known as Mucuna Pruriens which is considered to be one of the better T boosters going.

The reason behind this is that it promotes the HGH and blocks prolactin, making more room for T to thrive.

Is there enough of it to have a true effect? We don’t know as it is part of a proprietary blend.

TestoFuel vs ISA-Test GF Side Effects

The good news is that there does not appear to be anything in either product that should concern the user.

There are always allergies to consider so check the label but even the proprietary blends of ISA-Test GF do not appear to have anything to worry us.

TestoFuel Vs ISA-Test GF Pros and Cons

TestoFuel Pros

  • 100% Natural Ingredients
  • No side effects
  • Plenty of great reviews
  • Reliable Testosterone booster
  • No proprietary blends
  • Reputable company

ISA-Test GF Pros

  • Some decent ingredients
  • Big company

TestoFuel Cons

  • Only available online

ISA-Test GF Cons

  • Some ingredients underdosed
  • Proprietary blends
  • Too many ineffective ingredients
  • Suggested serving not ideal

TestoFuel Vs ISA-Test GF Conclusion

Winner: TestoFuel

TestoFuel Review

Buy TestoFuel from www.testofuel.com

Read our full TestoFuel Review

Although the mutual ingredients were good and it felt like it was a close start, the only truly great T booster in there was Zinc.

The more significant change came when we got to the individual ingredients and we could see just how much emphasis TestoFuel has put into the top testosterone booster ingredients, as well as ensuring they are optimally dosed.

This was the problem for ISA-Test GF, they had a good start but there were so many insignificant ingredients the further you get down the label, they also had Tribulus in there – a big let down!

To sum up our TestoFuel Vs ISA-Test GF review, you want to side with the most effective product, and that today is TestoFuel, it is no wonder it is the top testosterone booster we have seen.

To find out more about this great product, check out our in-depth TestoFuel review.

Buy TestoFuel from www.testofuel.com

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